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Goodwill and Intangible Assets Disclosure [Abstract]

Basis of Presentation

2. Basis of Presentation

Basis of presentation

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”).

Reclassifications

Our revenue from "subscriptions" and "maintenance" and a portion of our "services and other" revenue have been combined within "recurring" revenue beginning in 2018. In order to provide comparability between periods presented, those amounts of revenue have been combined within "recurring" revenue in the previously reported consolidated statements of comprehensive income to conform to the presentation of the current period. Similarly, "cost of subscriptions" and "cost of maintenance" and a portion of "cost of services and other" have been combined within "cost of recurring" in the previously reported consolidated statements of comprehensive income to conform to the presentation of the current period. "Services and other" revenue has been renamed as "one-time services and other" revenue and consists of revenue that did not meet the description of "recurring" revenue in the consolidated statements of comprehensive income. "Cost of services and other" has been renamed as "cost of one-time services and other" and consists of costs that did not meet the description of those related to "recurring" revenue in the consolidated statements of comprehensive income.

Basis of consolidation

The consolidated financial statements include the accounts of Blackbaud, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. On an ongoing basis, we reconsider and evaluate our estimates and assumptions, including those that impact revenue recognition, long-lived and intangible assets including goodwill, income taxes, business combinations, stock-based compensation, capitalization of software development costs, our allowances for sales returns and doubtful accounts, costs of obtaining contracts, valuation of derivative instruments and loss contingencies, among others. Changes in the facts or circumstances underlying these estimates could result in material changes and actual results could materially differ from these estimates.

Recently adopted accounting pronouncements

As previously disclosed, during the three months ended September 30, 2016 we early adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which addresses, among other items, the accounting for income taxes and forfeitures, and cash flow presentation of share-based compensation. Our adoption of ASU 2016-09 required us to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. Upon adoption, we elected to account for forfeitures as they occur using a modified retrospective transition method, which resulted in a cumulative-effect adjustment of $0.9 million to reduce our January 1, 2016 opening retained earnings balance. Adoption of the new standard also resulted in the recognition of excess tax benefits in our provision for income taxes rather than paid-in capital of $7.7 million for the year ended December 31, 2016.

In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. ASU 2014-09 replaces most previous revenue recognition guidance in GAAP and requires the recognition of revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also provides guidance on the recognition of costs related to obtaining and fulfilling customer contracts.

We adopted ASU 2014-09 as of January 1, 2018 utilizing the full retrospective method of transition, which requires that the standard be applied to all periods presented. The impact of adopting ASU 2014-09 on our total revenues for 2017 and 2016 was not material. The primary impacts of adopting ASU 2014-09 relate to the deferral of incremental commission and other costs of obtaining contracts with customers and the increase to the amortization period for those costs. Previously, we deferred only direct and incremental commission costs to obtain a contract and amortized those costs over the contract term, generally three years, as the revenue was recognized. Under the new standard, we defer all incremental commission and related fringe benefit costs to obtain a contract and amortize these costs in a manner that aligns with the expected period of benefit. We utilized the 'portfolio approach' practical expedient in ASC 606-10-10-4, which allows entities to apply the guidance to a portfolio of contracts with similar characteristics because the effects on the financial statements of this approach would not differ materially from applying the guidance to individual contracts. Using the 'portfolio approach' and taking into consideration our customer contracts, our technology and other factors, we determined the expected period of benefit to be five years. We do not generally pay commissions for contract renewals.

Select adjusted financial statement information, which reflects our adoption of ASU 2014-09 is set forth below.



Consolidated balance sheets:
	As of December 31, 2016							As of December 31, 2017
(dollars in thousands)	As Reported		Adjustments			As Adjusted		As Reported		Adjustments			As Adjusted
Accounts receivable, net of allowance	$	88,932	$	(671	)	$	88,261	$	96,293	$	(614	)	$	95,679
Prepaid expenses and other current assets	$	48,314	$	5,897		$	54,211	$	56,099	$	5,879		$	61,978
Other assets	$	22,524	$	29,573		$	52,097	$	24,083	$	33,155		$	57,238
Deferred revenue, current portion	$	244,500	$	(651	)	$	243,849	$	276,456	$	(1,393	)	$	275,063
Deferred tax liability	$	29,558	$	13,917		$	43,475	$	37,597	$	10,426		$	48,023
Retained earnings	$	152,729	$	21,680		$	174,409	$	195,649	$	29,380		$	225,029



Consolidated statements of comprehensive income:
	Year ended December 31, 2016							Year ended December 31, 2017
(dollars in thousands, except per share amounts)	As Reported⁽¹⁾		Adjustments			As Adjusted		As Reported⁽¹⁾		Adjustments			As Adjusted
Revenue
Recurring	$	575,933	$	33,130		$	609,063	$	651,031	$	33,552		$	684,583
One-time services and other	154,882		(32,303		)	122,579		137,275		(33,371		)	103,904
Total revenue	$	730,815	$	827		$	731,642	$	788,306	$	181		$	788,487
Cost of revenue
Recurring	$	235,977	$	10,692		$	246,669	$	265,713	$	11,926		$	277,639
One-time services and other	103,243		(10,692		)	92,551		96,191		(11,926		)	84,265
Total cost of revenue	$	339,220	$	—		$	339,220	$	361,904	$	—		$	361,904
Operating expenses
Sales, marketing and customer success	$	155,754	$	(5,597	)	$	150,157	$	173,525	$	(3,966	)	$	169,559
Net income	$	41,515	$	3,889		$	45,404	$	65,933	$	7,700		$	73,633
Basic earnings per share	$	0.90	$	0.08		$	0.98	$	1.41	$	0.17		$	1.58
Diluted earnings per share	$	0.88	$	0.08		$	0.96	$	1.38	$	0.16		$	1.54


(1)	See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Our adoption of ASU 2014-09 had no impact on our net cash provided by or used in operating, investing or financing activities for any of the periods reported.

In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the U.S. Tax Cuts and Jobs Act (the “Tax Act”) signed into law in December 2017. We early adopted ASU 2018-02 effective January 1, 2018 and recorded an insignificant reclassification for the stranded tax effects resulting from the Tax Act from accumulated other comprehensive loss to retained earnings.

Recently issued accounting pronouncements

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 will require lessees to record most leases on their balance sheets but recognize expenses in the income statement in a manner similar to current guidance. The updated guidance also eliminates certain real estate-specific provisions and changes the guidance on sale-leaseback transactions, initial direct costs and lease executory costs for all entities. All entities will classify leases to determine how to recognize lease-related revenue and expense. Upon adoption, entities will be required to use a modified retrospective approach with an option to use certain practical expedients. We expect to adopt ASU 2016-02 when effective, using the transition method that allows us to initially apply the guidance at the adoption date of January 1, 2019 and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We expect to use the package of practical expedients that allows us to not reassess: (1) whether any expired or existing contracts are or contain leases, (2) lease classification for any expired or existing leases and (3) initial direct costs for any expired or existing leases. We expect ASU 2016-02 will impact our consolidated financial statements and related disclosures. We are currently evaluating the extent of the impact and expect that most of our lease commitments will be subject to the updated guidance and recognized as lease liabilities and right-of-use assets on our consolidated balance sheets upon adoption. Based on our portfolio of leases as of December 31, 2018, and our evaluation to date, we expect to recognize aggregate lease liabilities of between $105 million and $135 million, primarily relating to real estate.

Summary of significant accounting policies

Revenue recognition

Our revenue is primarily generated from the following sources: (i) charging for the use of our software solutions in cloud-based and hosted environments; (ii) providing payment and transaction services; (iii) providing software maintenance and

support services; and (iv) providing professional services, including implementation, consulting, training, analytic and other services. Revenues are recognized when control of these services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those services.

We determine revenue recognition through the following steps:

•Identification of the contract, or contracts, with a customer;

•Identification of the performance obligations in the contract;

•Determination of the transaction price;

•Allocation of the transaction price to the performance obligations in the contract; and

•Recognition of revenue when, or as, we satisfy a performance obligation.

Recurring

Recurring revenue represents stand-ready performance obligations in which we are making our solutions or services available to our customers continuously over time or the value of the contract renews. Therefore, recurring revenue is generally recognized over time on a ratable basis over the contract term, beginning on the date that the solution or service is made available to the customer. Our recurring revenue contracts are generally for a term of three years at contract inception with one to three-year renewals thereafter, billed annually in advance and non-cancelable.

Recurring revenue is comprised of fees for the use of our subscription-based software solutions, which includes providing access to cloud-based solutions, hosting services, online training programs, subscription-based analytic services, such as donor acquisitions and data enrichment, and payment services. Recurring revenue also includes fees from maintenance services for our on-premises solutions, services included in our renewable subscription contracts, subscription-based contracts for professional services and variable transaction revenue associated with the use of our solutions.

Our payment services are offered with the assistance of third-party vendors. In general, when we are the principal in a transaction based on the factors identified in ASC 606-10-55-36 through 55-40, we record the revenue and related costs on a gross basis. Otherwise, we net the cost of revenue associated with the service against the gross revenue (amount billed to the customer) and record the net amount as revenue. For payment and transaction services, we have the right to invoice the customer in an amount that directly corresponds with the value to the customer of our performance to date. Therefore, we recognize revenue for these services over time based on the amount billable to the customer in accordance with the 'as invoiced' practical expedient in ASC 606-10-55-18.

One-time services and other

One-time services and other revenue primarily consists of fees for one-time consulting, analytic and onsite training services.

We generally bill consulting services based on hourly rates plus reimbursable travel-related expenses. Fixed price consulting engagements are generally billed as milestones towards completion are reached. Revenue for all consulting services is recognized over time as the services are performed.

We generally recognize analytic services revenue from donor prospect research engagements, the sale of lists of potential donors, data enrichment engagements and benchmarking studies at a point in time (upon delivery).

In certain cases, we sell training at a fixed rate for each specific class at a per attendee price or at a packaged price for several attendees, and recognize the related revenue upon the customer attending and completing training.

Contracts with multiple performance obligations

Some of our contracts with customers contain multiple performance obligations. For these contracts, we account for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative standalone selling price basis. Standalone selling prices of our solutions and services are typically estimated based on observable transactions when the solutions or services are sold on a standalone basis.

Costs of obtaining contracts, contract assets and deferred revenue

We pay sales commissions at the time contracts with customers are signed or shortly thereafter, depending on the size and duration of the sales contract. Sales commissions and related fringe benefits earned by our sales force are considered incremental and recoverable costs of obtaining a contract with a customer. These costs are deferred and then amortized in a manner that aligns with the expected period of benefit, which we have determined to be five years. We determined the period of benefit by taking into consideration our customer contracts, including renewals, retention, our technology and other factors. We do not generally pay commissions for contract renewals. The related amortization expense is included in sales, marketing and customer success expense in our consolidated statements of comprehensive income.

A contract asset is recorded when revenue is recognized in advance of our right to receive consideration (i.e., we must satisfy additional performance obligations in order to receive consideration). Amounts are recorded as receivables when our right to consideration is unconditional (i.e., only the passage of time is required before payment of the consideration is due). Our contract assets are recorded within prepaid expenses and other current assets on our consolidated balance sheets. To the extent that our customers are billed for our solutions and services in advance of us satisfying the related performance obligations, we record such amounts in deferred revenue.

Fair value measurements

We measure certain financial assets and liabilities at fair value on a recurring basis, including derivative instruments. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. An active market is defined as a market in which transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis. We use a three-tier fair value hierarchy to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows:


•	Level 1 - Quoted prices for identical assets or liabilities in active markets;


•	Level 2 - Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets in markets that are not active, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets; and


•	Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are unobservable.

Our financial assets and liabilities are classified in their entirety within the hierarchy based on the lowest level of input that is significant to fair value measurement. Changes to a financial asset's or liability's level within the fair value hierarchy are determined as of the end of a reporting period. All methods of assessing fair value result in a general approximation of value, and such value may never actually be realized.

Derivative instruments

We generally use derivative instruments to manage interest rate risk. We view derivative instruments as risk management tools and do not use them for trading or speculative purposes. Our policy requires that derivatives used for hedging purposes be designated and effective as a hedge of the identified risk exposure at the inception of the contract. Accordingly, changes in fair value of the derivative contract must be highly correlated with changes in the fair value of the underlying hedged item at inception of the hedge and over the life of the hedge contract.

We record all derivative instruments on our consolidated balance sheets at fair value. If the derivative is designated as a cash flow hedge, the effective portions of the changes in fair value of the derivative are recorded in other comprehensive income and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. Ineffective portions of the changes in the fair value of cash flow hedges are recognized currently in earnings. See Note 10 of these consolidated financial statements for further discussion of our derivative instruments.

Sales taxes

We present sales taxes and other taxes collected from customers and remitted to governmental authorities on a net basis and, as such, exclude them from revenues.

Cash and cash equivalents

We consider all highly liquid investments purchased with an original maturity of three months or less and cash items in transit to be cash equivalents.

Restricted cash due to customers; Customer funds receivable; Due to customers

Restricted cash due to customers consists of monies collected by us and payable to our customers, net of the associated transaction fees earned. Monies associated with amounts due to customers are segregated in separate bank accounts and used exclusively for the payment of amounts due to customers. This usage restriction is either legally or internally imposed and reflects our intention with regard to such deposits. Customer funds receivable consists of monies we expect to collect and remit to our customers.

Concentration of credit risk

Financial instruments that potentially subject us to concentrations of credit risk consist of cash and cash equivalents, restricted cash due to customers and accounts receivable. Our cash and cash equivalents and restricted cash due to customers are placed with high credit-quality financial institutions. Our accounts receivable is derived from sales to customers who primarily operate in the nonprofit sector. With respect to accounts receivable, we perform ongoing evaluations of our customers and maintain an allowance for doubtful accounts based on historical experience and our expectations of future losses. As of and for the years ended December 31, 2018, 2017 and 2016, there were no significant concentrations with respect to our consolidated revenues or accounts receivable.

Property and equipment

We record property and equipment assets at cost and depreciate them over their estimated useful lives using the straight-line method. Leasehold improvements are depreciated over the lesser of the term of the lease or the estimated useful life of the asset. Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is credited or charged to earnings. Repair and maintenance costs are expensed as incurred.

Construction-in-progress represents purchases of computer software and hardware associated with new internal system implementation projects which had not been placed in service at the respective balance sheet dates. We transferred these assets to the applicable property category on the date they are placed in service. There was no capitalized interest applicable to construction-in-progress for the years ended December 31, 2018, 2017 and 2016.

Business combinations

We include the operating results of acquired companies as well as the net assets acquired and liabilities assumed in our consolidated financial statements from the date of acquisition. We are required to allocate the purchase price of acquired companies to the tangible and intangible assets acquired and liabilities assumed at the acquisition date based upon their estimated fair values. Goodwill as of the acquisition date represents the excess of the purchase consideration of an acquired business over the fair value of the underlying net tangible and intangible assets acquired and liabilities assumed. This allocation and valuation require management to make significant estimates and assumptions, especially with respect to long-lived and intangible assets.

Critical estimates in valuing intangible assets include, but are not limited to, estimates about: future expected cash flows from customer contracts, proprietary technology and non-compete agreements; the acquired company's brand awareness and market position, assumptions about the period of time the brand will continue to be valuable; as well as expected costs to develop any in-process research and development into commercially viable solutions and estimated cash flows from the projects when completed, and discount rates. Our estimates of fair value are based upon assumptions we believe to be reasonable, but which are inherently uncertain and unpredictable, and unanticipated events and changes in circumstances may occur.

Goodwill

Goodwill represents the purchase price in excess of the net amount assigned to assets acquired and liabilities assumed by us in a business combination. Goodwill is not amortized, but tested annually for impairment on the first day of our fourth quarter, or more frequently if indicators of potential impairment arise.

Accounting guidance permits entities to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis to determine whether it is necessary to perform the quantitative impairment test. Significant judgment is required in the assessment of qualitative factors, including but not limited to an evaluation of macroeconomic conditions as they relate to our business, industry and market trends, as well as the overall future financial performance of identified reporting units and future opportunities in the markets in which we operate.

The quantitative impairment test compares the fair values of identified reporting units with their respective carrying amounts. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. Based on our current internal reporting structure, we currently have one operating segment, one reportable segment, and one reporting unit. In each of 2018, 2017 and 2016, we performed the quantitative impairment test which indicated that the estimated fair values of the identified reporting units significantly exceeded their respective carrying values. There was no impairment of goodwill during 2018, 2017 or 2016.

Intangible assets other than goodwill

We amortize finite-lived intangible assets over their estimated useful lives as follows.



	Basis of amortization	Amortization period (in years)
Customer relationships	Straight-line and accelerated⁽¹⁾	4-17
Marketing assets	Straight-line	1-15
Acquired software and technology	Straight-line and accelerated⁽¹⁾	1-11
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Indefinite-lived intangible assets consist of trade names. We evaluate the estimated useful lives and the potential for impairment of finite and indefinite-lived intangible assets on an annual basis or more frequently if events or circumstances indicate revised estimates of useful lives may be appropriate or that the carrying amount may be impaired. If the carrying amount of a finite-lived intangible asset is no longer recoverable based upon the undiscounted cash flows of the asset, the amount of impairment is the difference between the carrying amount and the fair value of the asset. Substantially all of our intangible assets were acquired in business combinations. There was no impairment of acquired intangible assets during 2018, 2017 or 2016.

Deferred financing costs

Deferred financing costs included in other assets represent the direct third-party costs of entering into the revolving (line-of-credit) portion of our credit facility in June 2017 and portions of the unamortized deferred financing costs from prior facilities. These costs are amortized ratably over the term of the credit facility as interest expense.

Stock-based compensation

We measure stock-based compensation cost at the grant date based on the fair value of the award and recognize it as expense over the requisite service period, which is the vesting period. We determine the fair value of stock options and stock appreciation rights using a Black-Scholes option pricing model, which requires us to use significant judgment to make estimates regarding the life of the award, volatility of our stock price, the risk-free interest rate and the dividend yield of

our stock over the life of the award. We determine the fair value of awards that contain market conditions using a Monte Carlo simulation model. Changes to these estimates would result in different fair values of awards.

We recognize the effect of awards for which the requisite service period is not rendered when the award is forfeited (that is, we recognize the effect of forfeitures in compensation cost when they occur). Previously recognized compensation cost for an award is reversed in the period that the award is forfeited. Income tax benefits resulting from the vesting and exercise of stock-based compensation awards are recognized in the period the unit or award is vested or option or right is exercised.

Income taxes

We make estimates and judgments in accounting for income taxes. The calculation of the income tax provision requires estimates due to transactions, credits and calculations where the ultimate tax determination is uncertain. Uncertainties arise as a consequence of the actual source of taxable income between domestic and foreign locations, the outcome of tax audits and the ultimate utilization of tax credits. To the extent actual results differ from estimated amounts recorded, such differences will impact the income tax provision in the period in which the determination is made.

We make estimates in determining tax assets and liabilities, which arise from differences in the timing of recognition of revenue and expense for tax and financial statement purposes. We record valuation allowances to reduce our deferred tax assets to the amount expected to be realized. In assessing the adequacy of a recorded valuation allowance significant judgment is required. We consider all positive and negative evidence and a variety of factors including the scheduled reversal of deferred tax liabilities, historical and projected future taxable income, and prudent and feasible tax planning strategies. If we determine there is less than a 50% likelihood that we will be able to use a deferred tax asset in the future in excess of its net carrying value, then an adjustment to the deferred tax asset valuation allowance is made to increase income tax expense, thereby reducing net income in the period such determination was made.

We measure and recognize uncertain tax positions. To recognize such positions, we must first determine if it is more likely than not that the position will be sustained upon audit. We must then measure the benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. Significant judgment is required in the identification and measurement of uncertain tax positions.

Foreign currency

Net assets recorded in a foreign currency are translated at the exchange rate on the balance sheet date. Revenue and expense items are translated using an average of monthly exchange rates. The resulting translation adjustments are recorded in accumulated other comprehensive income.

Gains and losses resulting from foreign currency transactions denominated in currency other than the functional currency are recorded at the approximate rate of exchange at the transaction date in other expense, net. For the years ended December 31, 2018 and 2016, we recorded net foreign currency losses of $0.9 million each year. For the year ended December 31, 2017, we recorded a net foreign currency gain of $1.1 million.

Research and development

Research and development costs are expensed as incurred. These costs include compensation costs for engineering and product management personnel, third-party contractor expenses, software development tools and other expenses related to researching and developing new solutions, upgrading and enhancing existing solutions, and allocated depreciation, facilities and IT support costs.

Software development costs

We incur certain costs associated with the development of internal-use software, which are primarily related to activities performed to develop our cloud-based solutions. Internal and external costs incurred in the preliminary project stage of internal-use software development are expensed as incurred. Once the software being developed has reached the application development stage, qualifying internal costs including payroll and payroll-related costs of employees who are directly associated with and devote time to the software project as well as external direct costs of materials and services

are capitalized. Capitalization ceases at the point at which the developed software is substantially complete and ready for its intended use, which is typically upon completion of all substantial testing. Qualifying costs capitalized during the application development stage include those related to specific upgrades and enhancements when it is probable that those costs incurred will result in additional functionality. Overhead costs, including general and administrative costs, as well as maintenance, training and all other costs associated with post-implementation stage activities are expensed as incurred. In addition, internal costs that cannot be reasonably separated between maintenance and relatively minor upgrades and enhancements are expensed as incurred. Historically, we have also incurred and capitalized costs in connection with the development of certain of our software solutions licensed to customers on a perpetual basis, which are accounted for as costs of software to be sold, leased or otherwise marketed; however, there were no costs capitalized related to those solutions as of December 31, 2018 and 2017.

Qualifying capitalized software development costs are amortized on a straight-line basis over the software asset's estimated useful life, which is generally three to seven years. We evaluate the useful lives of these assets on an annual basis and test for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. There were no impairment charges during the years ended December 31, 2018, 2017, and 2016.

Sales returns and allowance for doubtful accounts

We maintain a reserve for returns and credits which is estimated based on several factors including historical experience, known credits yet to be issued, the aging of customer accounts and the nature of service level commitments. A considerable amount of judgment is required in assessing these factors. Provisions for sales returns and credits are charged against the related revenue items.

Accounts receivable are recorded at original invoice amounts less an allowance for doubtful accounts, an amount we estimate to be sufficient to provide adequate protection against losses resulting from extending credit to our customers. In judging the adequacy of the allowance for doubtful accounts, we consider multiple factors including historical bad debt experience, the general economic environment and the aging of our receivables. A considerable amount of judgment is required in assessing these factors and if any receivables were to deteriorate, an additional provision for doubtful accounts could be required. Accounts are written off after all means of collection are exhausted and recovery is considered remote. Provisions for doubtful accounts are recorded in general and administrative expense.

Below is a summary of the changes in our allowance for sales returns.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	4,400	$	4,952	$	(5,975	)	$	3,377
2017	2,704		10,511		(8,815		)	4,400
2016	4,431		3,060		(4,787		)	2,704

Below is a summary of the changes in our allowance for doubtful accounts.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	741	$	2,446	$	(1,842	)	$	1,345
2017	587		1,148		(994		)	741
2016	512		499		(424		)	587

Advertising costs

We expense advertising costs as incurred, which was $4.0 million, $2.4 million and $2.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Restructuring costs

Restructuring costs include charges for the costs of exit or disposal activities. The liability for costs associated with exit or disposal activities is measured initially at fair value and only recognized when the liability is incurred. For details of our restructuring activities, see Note 19 of these consolidated financial statements.

Impairment of long-lived assets

We review long-lived assets for impairment when events change or circumstances indicate the carrying amount may not be recoverable. Events or changes in circumstances that indicate the carrying amount may not be recoverable include, but are not limited to, a significant decrease in the market value of the business or asset acquired, a significant adverse change in the extent or manner in which the business or asset acquired is used or significant adverse change in the business climate. If such events or changes in circumstances are present, the undiscounted cash flow method is used to determine whether the asset is impaired. No impairment of long-lived assets occurred in 2018, 2017 or 2016.

Contingencies

We are subject to the possibility of various loss contingencies in the normal course of business. We record an accrual for a contingency when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Often these issues are subject to substantial uncertainties and, therefore, the probability of loss and the estimation of damages are difficult to ascertain. These assessments can involve a series of complex judgments about future events and can rely heavily on estimates and assumptions that have been deemed reasonable by us. Although we believe we have substantial defenses in these matters, we could incur judgments or enter into settlements of claims that could have a material adverse effect on our consolidated financial position, results of operations or cash flows in any particular period.

Earnings per share

We compute basic earnings per share by dividing net income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average number of common shares and dilutive potential common shares outstanding during the period. Diluted earnings per share reflect the assumed exercise, settlement and vesting of all dilutive securities using the “treasury stock method” except when the effect is anti-dilutive. Potentially dilutive securities consist of shares issuable upon the exercise of stock options and stock appreciation rights and vesting of restricted stock awards and units.

Business Combinations

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Business Combinations

3. Business Combinations

2018 Acquisitions

Reeher

On April 30, 2018, we acquired all of the outstanding equity securities, including all voting equity interests, of Reeher LLC, a Minnesota limited liability company (“Reeher”), pursuant to a securities purchase agreement. The acquisition expands our fundraising performance management capabilities and is intended to drive more effective fundraising and greater social good outcomes for our customers. We acquired the equity securities for an aggregate purchase price of $41.2 million in cash, net of closing adjustments. The purchase price and related expenses were funded primarily through borrowings under the 2017 Credit Facility (as defined in Note 9 of these consolidated financial statements). As a result of the acquisition, Reeher has become a wholly-owned subsidiary of ours. The operating results of Reeher have been included in our consolidated financial statements from the date of acquisition. During 2018, we incurred insignificant acquisition-related expenses associated with the acquisition, which were recorded in general and administrative expense.

The fair values assigned to the assets acquired and liabilities assumed in the table below are based on our best estimates and assumptions as of the reporting date and are considered preliminary pending finalization. The estimates and assumptions are subject to change as we obtain additional information during the measurement period, which may be up to one year from the acquisition date. The assets and liabilities, pending finalization, include the valuation of intangible assets as well as the assumed deferred revenue and deferred income tax balances.



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	1,683
Property and equipment	755
Identifiable intangible assets	27,055
Deferred tax asset	713
Deferred revenue	(2,700		)
Goodwill	13,681
Total purchase price	$	41,187

The estimated fair value of accounts receivable acquired approximates the contractual value of $1.1 million and $11.7 million of the goodwill arising in the acquisition is deductible for income tax purposes. The estimated goodwill recognized is attributable primarily to the opportunities for expected synergies from combining the operations and assembled workforce of Reeher.

The Reeher acquisition resulted in the identification of the following identifiable intangible assets:



	Intangible assets acquired		Weighted average amortization period
Reeher	(in thousands)		(in years)
Acquired technology	$	19,500	11
Customer relationships	7,000		10
Marketing assets	480		3
Non-compete agreements	75		2
Total intangible assets	$	27,055	11

The estimated fair values of the intangible assets were based on variations of the income approach, which estimates fair value based upon the present value of cash flows that the assets are expected to generate, and which included the relief-from-royalty method, incremental cash flow method, including the comparative (with and without) method and multi-period excess earnings method, depending on the intangible asset being valued. The method of amortization of identifiable

finite-lived intangible assets is based on the expected pattern in which the estimated economic benefits of the respective assets are consumed or otherwise used up. Customer relationships and acquired technology are being amortized on an accelerated basis. Marketing assets and non-compete agreements are being amortized on a straight-line basis.

We determined that the impact of this acquisition was not material to our consolidated financial statements; therefore, revenue and earnings since the acquisition date and pro forma information are not required or presented.

2017 Acquisitions

JustGiving

On October 2, 2017, Blackbaud Global Limited (“Blackbaud Global”), a United Kingdom limited liability company and wholly-owned subsidiary of ours, acquired the entire issued share capital, including all voting equity interests, of Giving Limited, a United Kingdom private limited company doing business as “JustGiving” for an aggregate purchase price, including certain post-closing adjustments set forth in the related stock purchase agreement, of £102.4 million, or approximately $137.2 million, in cash. JustGiving is a market leading social platform for giving, and the acquisition is expected to enhance our capabilities to serve both individual donors and nonprofits, expanding the peer-to-peer fundraising capabilities we offer today. As a result of the acquisition, JustGiving has become a wholly-owned subsidiary of ours. We financed the acquisition of JustGiving through cash on hand and borrowings of $138.7 million under the 2017 Credit Facility. We finalized the purchase price allocation of JustGiving, including the valuation of assets acquired and liabilities assumed, during the fourth quarter of 2018. All measurement period adjustments were insignificant. We determined that the impact of this acquisition was not material to our consolidated financial statements; therefore, revenue and earnings since the acquisition date and pro forma information are not required or presented.

AcademicWorks

On April 3, 2017, we acquired all of the outstanding shares of capital stock, including all voting equity interests, of AcademicWorks, Inc., a Texas corporation ("AcademicWorks"), pursuant to a stock purchase agreement. AcademicWorks is the market leader in scholarship management for higher education and K-12 institutions, foundations, and grant-making institutions. The acquisition extends our offerings for our higher education, K-12, and corporate and foundation customers. We acquired AcademicWorks for $52.1 million in cash, net of closing adjustments. We financed the acquisition through a draw down of a revolving credit loan under our then-existing credit facility. As a result of the acquisition, AcademicWorks has become a wholly-owned subsidiary of ours. We finalized the purchase price allocation of AcademicWorks, including the valuation of assets acquired and liabilities assumed, during the first quarter of 2018. All measurement period adjustments were insignificant. We determined that the impact of this acquisition was not material to our consolidated financial statements; therefore, revenue and earnings since the acquisition date and pro forma information are not required or presented.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Other Intangible Assets

4. Goodwill and Other Intangible Assets

The change in our goodwill during 2018 consisted of the following:



(dollars in thousands)	Total
Balance at December 31, 2017	$	530,249
Additions related to current year business combinations	18,271
Adjustments related to prior year business combinations	(333		)
Effect of foreign currency translation	(2,974		)
Balance at December 31, 2018	$	545,213

We have recorded intangible assets acquired in various business combinations based on their fair values at the date of acquisition. The table below sets forth the balances of each class of intangible asset and related amortization as of:



	December 31,
(dollars in thousands)	2018			2017
Finite-lived gross carrying amount
Customer relationships	$	280,309		$	274,458
Marketing assets	48,484			49,661
Acquired software and technology	211,654			193,010
Non-compete agreements	2,499			2,603
Database	4,275			4,275
Total finite-lived gross carrying amount	547,221			524,007
Accumulated amortization
Customer relationships	(116,648		)	(96,662		)
Marketing assets	(16,395		)	(12,444		)
Acquired software and technology	(118,268		)	(96,528		)
Non-compete agreements	(1,618		)	(1,125		)
Database	(4,275		)	(4,197		)
Total accumulated amortization	(257,204		)	(210,956		)
Indefinite-lived gross carrying amount
Marketing assets	1,600			1,600
Intangible assets, net	$	291,617		$	314,651

Changes to the gross carrying amounts of intangible asset classes during 2018 were primarily related to our business acquisitions as described in Note 3 of these financial statements and the effect of foreign currency translation.

Amortization expense

Amortization expense related to finite-lived intangible assets acquired in business combinations is allocated to cost of revenue on the consolidated statements of comprehensive income based on the revenue stream to which the asset contributes, except for marketing assets and non-compete agreements, for which the associated amortization expense is included in operating expenses.

The following table summarizes amortization expense of our finite-lived intangible assets:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	39,877	$	37,557	$	36,597
Cost of one-time services and other	2,356		2,542		2,961
Total included in cost of revenue	42,233		40,099		39,558
Included in operating expenses	4,844		3,271		2,840
Total amortization of intangibles from business combinations	$	47,077	$	43,370	$	42,398

The following table outlines the estimated future amortization expense for each of the next five years for our finite-lived intangible assets as of December 31, 2018:



Years ending December 31, (dollars in thousands)	Amortization expense
2019	$	45,266
2020	36,995
2021	31,453
2022	27,969
2023	26,213
Total	$	167,896

Earnings Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share

5. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:



	Years ended December 31,
(dollars in thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	44,841	$	73,633	$	45,404
Denominator:
Weighted average common shares	47,206,669		46,669,440		46,132,389
Add effect of dilutive securities:
Stock-based awards	838,415		1,106,262		1,184,149
Weighted average common shares assuming dilution	48,045,084		47,775,702		47,316,538
Earnings per share:
Basic	$	0.95	$	1.58	$	0.98
Diluted	$	0.93	$	1.54	$	0.96

Anti-dilutive shares excluded from calculations of diluted earnings per share	48,881		4,634		7,339

Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Fair Value Measurements

6. Fair Value Measurements

Recurring fair value measurements

Assets and liabilities that are measured at fair value on a recurring basis consisted of the following, as of the dates indicated below:



	Fair value measurement using
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Fair value as of December 31, 2018
Financial assets:
Derivative instruments	$	—	$	2,260	$	—	$	2,260
Total financial assets	$	—	$	2,260	$	—	$	2,260

Fair value as of December 31, 2018
Financial liabilities:
Derivative instruments	$	—	$	186	$	—	$	186
Total financial liabilities	$	—	$	186	$	—	$	186

Fair value as of December 31, 2017
Financial assets:
Derivative instruments	$	—	$	1,283	$	—	$	1,283
Total financial assets	$	—	$	1,283	$	—	$	1,283

Our derivative instruments within the scope of ASC 815, Derivatives and Hedging, are required to be recorded at fair value. Our derivative instruments that are recorded at fair value include interest rate swaps.

The fair value of our interest rate swaps was based on model-driven valuations using LIBOR rates, which are observable at commonly quoted intervals. Accordingly, our interest rate swaps are classified within Level 2 of the fair value hierarchy.

We believe the carrying amounts of our cash and cash equivalents, restricted cash due to customers, accounts receivable, trade accounts payable, accrued expenses and other current liabilities and due to customers approximate their fair values at December 31, 2018 and December 31, 2017, due to the immediate or short-term maturity of these instruments.

We believe the carrying amount of our debt approximates its fair value at December 31, 2018 and December 31, 2017, as the debt bears interest rates that approximate market value. As LIBOR rates are observable at commonly quoted intervals, our debt is classified within Level 2 of the fair value hierarchy.

We did not transfer any assets or liabilities among the levels within the fair value hierarchy during the years ended December 31, 2018, 2017 and 2016. Additionally, we did not hold any Level 3 assets or liabilities during the years ended December 31, 2018, 2017 and 2016.

Non-recurring fair value measurements

Assets and liabilities that are measured at fair value on a non-recurring basis include intangible assets and goodwill, which are recognized at fair value during the period in which an acquisition is completed, from updated estimates and assumptions during the measurement period, or when they are considered to be impaired. These non-recurring fair value measurements, primarily for intangible assets acquired, are based on Level 3 unobservable inputs. In the event of an impairment, we determine the fair value of the intangible assets other than goodwill using a discounted cash flow approach, which contains significant unobservable inputs and, therefore, is considered a Level 3 fair value measurement. The unobservable inputs in the analysis generally include future cash flow projections and a discount rate. For goodwill impairment testing, we

estimate fair value using market-based methods including the use of market capitalization and consideration of a control premium.

There were no non-recurring fair value adjustments to intangible assets and goodwill during 2018, 2017 and 2016 except for certain business combination accounting adjustments to the initial fair value estimates of the assets acquired and liabilities assumed at the acquisition date from updated estimates and assumptions during the measurement period. See Note 3 and Note 4 to these consolidated financial statements for additional details. The measurement period may be up to one year from the acquisition date. We record any measurement period adjustments to the fair value of assets acquired and liabilities assumed, with the corresponding offset to goodwill.

Property and Equipment and Software Development Costs

12 Months Ended

Dec. 31, 2018

Property and Equipment Disclosure

7. Property and Equipment and Software Development Costs

Property and equipment

Property and equipment consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Equipment	2 - 5	$	4,243		$	2,728
Computer hardware	2 - 5	75,060			76,331
Computer software	2 - 5	34,294			34,058
Construction in progress	—	233			3,102
Furniture and fixtures	3 - 10	7,004			7,265
Leasehold improvements	Lesser of lease term or 10 years	26,795			22,359
Total property and equipment		147,629			145,843
Less: accumulated depreciation		(107,598		)	(103,600		)
Property and equipment, net		$	40,031		$	42,243

Depreciation expense was $15.9 million, $17.8 million and $19.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Property and equipment, net of depreciation, under capital leases at December 31, 2018 and 2017 was insignificant.

Software development costs

Software development costs consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Software development costs	3 - 7	$	121,983		$	84,404
Less: accumulated amortization		(46,884		)	(30,306		)
Software development costs, net		$	75,099		$	54,098

Amortization expense related to software development costs was $16.6 million, $12.8 million and $8.3 million for the years ended December 31, 2018, 2017 and 2016, respectively, and is included primarily in cost of recurring.

Consolidated Financial Statement Details

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidated Financial Statement Details

8. Consolidated Financial Statement Details

Prepaid expenses and other assets



(dollars in thousands)	December 31, 2018		December 31, 2017
Costs of obtaining contracts⁽¹⁾⁽²⁾	$	85,590	$	77,312
Prepaid software maintenance and subscriptions	21,134		17,402
Taxes, prepaid and receivable	2,055		10,548
Derivative instruments	2,260		1,283
Unbilled accounts receivable⁽³⁾	4,161		3,136
Security deposits	1,020		2,305
Other assets	8,931		7,230
Total prepaid expenses and other assets	125,151		119,216
Less: Long-term portion	65,363		57,238
Prepaid expenses and other current assets	$	59,788	$	61,978


(1)	Amortization expense from costs of obtaining contracts was $35.7 million for the year ended December 31, 2018.


(2)	The current portion of costs of obtaining contracts as of December 31, 2018 and 2017 was $31.7 million and $28.0 million, respectively.


(3)	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable.

Accrued expenses and other liabilities



(dollars in thousands)	December 31, 2018		December 31, 2017
Accrued bonuses	$	14,868	$	16,743
Accrued commissions and salaries	9,934		6,943
Taxes payable	6,204		5,517
Deferred rent liabilities	4,332		4,548
Customer credit balances	4,076		4,652
Lease incentive obligations	3,514		4,635
Unrecognized tax benefit	2,719		1,972
Accrued vacation costs	2,352		2,458
Accrued health care costs	1,497		2,615
Other liabilities	6,785		9,948
Total accrued expenses and other liabilities	56,281		60,031
Less: Long-term portion	9,388		5,632
Accrued expenses and other current liabilities	$	46,893	$	54,399

Deferred revenue



(dollars in thousands)	December 31, 2018		December 31, 2017
Recurring	$	286,960	$	265,513
One-time services and other	11,595		13,193
Total deferred revenue	298,555		278,706
Less: Long-term portion	2,564		3,643
Deferred revenue, current portion	$	295,991	$	275,063

Other income (expense), net



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Interest income	$	2,008		$	993		$	581
Gain on derivative instrument	—			462			—
Loss on debt extinguishment	—			(299		)	—
Other (expense) income, net	(905		)	1,104			(872		)
Other income (expense), net	$	1,103		$	2,260		$	(291	)

Debt

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Debt

9. Debt

The following table summarizes our debt balances and the related weighted average effective interest rates, which includes the effect of interest rate swap agreements.



	Debt balance at				Weighted average effective interest rate at
(dollars in thousands)	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
Credit facility:
Revolving credit loans	$	100,000	$	143,000	4.13	%	2.84	%
Term loans	288,750		296,250		3.44	%	2.64	%
Other debt	—		1,076		—	%	4.50	%
Total debt	388,750		440,326		3.61	%	2.71	%
Less: Unamortized discount and debt issuance costs	1,626		2,102
Less: Debt, current portion	7,500		8,576		3.77	%	3.03	%
Debt, net of current portion	$	379,624	$	429,648	3.61	%	2.71	%

2017 refinancing

We were previously party to a $325.0 million five-year credit facility entered into during February 2014. The credit facility included: a dollar and a designated currency revolving credit facility with sublimits for letters of credit and swingline loans (the “2014 Revolving Facility”) and a delayed draw term loan (the “2014 Term Loan”) together, (the “2014 Credit Facility”).

In June 2017, we entered into a five-year $700.0 million senior credit facility (the “2017 Credit Facility”). The 2017 Credit Facility includes a $400.0 million revolving credit facility (the “2017 Revolving Facility”) and a $300.0 million term loan facility (the “2017 Term Loan”). Upon closing we drew $300.0 million on a term loan and $110.0 million in revolving credit loans, which was used to repay all amounts outstanding under the 2014 Credit Facility, fees and expenses incurred in connection with the 2017 Credit Facility, and for other general corporate purposes.

Certain lenders of the 2014 Term Loan participated in the 2017 Term Loan and the change in the present value of our future cash flows to these lenders under the 2014 Term Loan and under the 2017 Term Loan was less than 10%. Accordingly, we accounted for the refinancing event for these lenders as a debt modification. Certain lenders of the 2014 Term Loan did not participate in the 2017 Term Loan. Accordingly, we accounted for the refinancing event for these lenders as a debt extinguishment. Certain lenders of the 2014 Revolving Facility participated in the 2017 Revolving Facility and provided increased borrowing capacities. Accordingly, we accounted for the refinancing event for these lenders as a debt modification. Certain lenders of the 2014 Revolving Facility did not participate in the 2017 Revolving Facility. Accordingly, we accounted for the refinancing event for these lenders as a debt extinguishment.

In 2017, we recorded an insignificant loss on debt extinguishment related to the write-off of debt discount and deferred financing costs for the portions of the 2014 Credit Facility considered to be extinguished. This loss was recognized in the consolidated statements of comprehensive income within other income (expense), net.

In connection with our entry into the 2017 Credit Facility, we paid $3.1 million in financing costs, of which $1.0 million were capitalized in other assets and, together with a portion of the unamortized deferred financing costs from the 2014 Credit Facility and prior facilities, are being amortized into interest expense ratably over the term of the new facility. As of December 31, 2018 and 2017, deferred financing costs totaling $0.9 million and $1.2 million, respectively, were included in other assets on our consolidated balance sheets. We recorded aggregate financing costs of $1.8 million as a direct deduction from the carrying amount of our debt liability, which related to debt discount (fees paid to lenders) and debt issuance costs for the 2017 Term Loan.

Summary of the 2017 Credit Facility

The 2017 Revolving Facility includes (i) a $50.0 million sublimit available for the issuance of standby letters of credit, (ii) a $50.0 million sublimit available for swingline loans, and (iii) a $100.0 million sublimit available for multicurrency borrowings.

The 2017 Credit Facility is secured by the stock and limited liability company interests of certain of our subsidiaries and any of our material domestic subsidiaries.

Amounts borrowed under the dollar tranche revolving credit loans and term loan under the 2017 Credit Facility bear interest at a rate per annum equal to, at our option, (a) a base rate equal to the highest of (i) the prime rate announced by Bank of America, N.A., (ii) the Federal Funds Rate plus 0.50% and (iii) the Eurocurrency Rate (which varies depending on the currency in which the loan is denominated) plus 1.00% (the “Base Rate”), in addition to a margin of 0.00% to 0.75%, or (b) Eurocurrency Rate plus a margin of 1.00% to 1.75%.

We also pay a quarterly commitment fee on the unused portion of the 2017 Revolving Facility from 0.15% to 0.25% per annum, depending on our net leverage ratio. At December 31, 2018, the commitment fee was 0.20%.

The term loan under the 2017 Credit Facility requires periodic principal payments. The balance of the term loan and any amounts drawn on the revolving credit loans are due upon maturity of the 2017 Credit Facility in June 2022. We evaluate the classification of our debt as current or non-current based on the required annual maturities of the 2017 Credit Facility.

The 2017 Credit Facility includes financial covenants related to the net leverage ratio and interest coverage ratio, as well as restrictions on our ability to declare and pay dividends and our ability to repurchase shares of our common stock. At December 31, 2018, we were in compliance with our debt covenants under the 2017 Credit Facility.

The 2017 Credit Facility also includes an option to request increases in the revolving commitments and/or request additional term loans in an aggregate principal amount of up to $200.0 million plus an amount, if any, such that the Net Leverage Ratio shall be no greater than 3.00 to 1.00. At December 31, 2018, our available borrowing capacity under the 2017 Credit Facility was $296.2 million.

Other debt

In September 2017, we entered into a two-year $2.2 million agreement to finance our purchase of software licenses and related services. The agreement was a non-interest-bearing note requiring annual payments, where the first payment was due in November 2017. Interest associated with the note was imputed at the rate we would incur for amounts borrowed under the 2017 Credit Facility. In October 2018, we repaid all amounts outstanding under the agreement.

Financing for 2018 acquisition

On April 30, 2018, we acquired Reeher for $41.2 million in cash, net of closing adjustments. We financed the acquisition with a revolving credit loan under the 2017 Credit Facility.

As of December 31, 2018, the required annual maturities related to the 2017 Credit Facility were as follows:



Years ending December 31, (dollars in thousands)	Annual maturities
2019	$	7,500
2020	7,500
2021	7,500
2022	366,250
2023	—
Thereafter	—
Total required maturities	$	388,750

Derivative Instruments

12 Months Ended

Dec. 31, 2018

Derivatives Instruments

10. Derivative Instruments

Cash flow hedges

We generally use derivative instruments to manage our variable interest rate risk. In July 2017, we entered into an interest rate swap agreement (the "July 2017 Swap Agreement"), which effectively converts portions of our variable rate debt under our credit facility to a fixed rate for the term of the July 2017 Swap Agreement. The notional value of the July 2017 Swap Agreement was $150.0 million with an effective date beginning in July 2017 through July 2021. We designated the July 2017 Swap Agreement as a cash flow hedge at the inception of the contract.

In February 2018, we entered into an additional interest rate swap agreement (the "February 2018 Swap Agreement"), which effectively converts portions of our variable rate debt under our credit facility to a fixed rate for the term of the February 2018 Swap Agreement. The notional value of the February 2018 Swap Agreement was $50.0 million with an effective date beginning in February 2018 through June 2021. We designated the February 2018 Swap Agreement as a cash flow hedge at the inception of the contract.

Undesignated contracts

In June 2017, we entered into a foreign currency option contract to hedge our exposure to currency fluctuations in connection with our acquisition of JustGiving because the purchase price was denominated in British Pounds. The notional value of the instrument was £100.0 million with an effective date beginning in June 2017 and maturing in September 2017. We settled the foreign currency option contract in September 2017. We did not designate the foreign currency option contract as a cash flow hedge for accounting purposes since it involved a business combination. As such, changes in the fair value of this derivative were recognized in earnings. The insignificant premium paid for this option and the $1.0 million in proceeds from the settlement are shown within cash flows from investing activities in our consolidated statements of cash flows.

As the closing date of our acquisition of JustGiving extended beyond the settlement date of the foreign currency option contract, we entered into a foreign currency forward contract in September 2017 with settlement in October 2017. The notional value of the instrument was £103.5 million. We did not designate the foreign currency forward contract as a cash flow hedge for accounting purposes since it involved a business combination. As such, changes in the fair value of this derivative were recognized in earnings. The insignificant premium paid for this forward contract is shown within cash flows from investing activities in our consolidated statements of cash flows.

The fair values of our derivative instruments were as follows as of:



		Asset Derivatives					Liability Derivatives
(dollars in thousands)	Balance sheet location	December 31, 2018		December 31, 2017		Balance sheet location	December 31, 2018		December 31, 2017
Derivative instruments designated as hedging instruments:
Interest rate swaps, current portion	Prepaid expenses and other current assets	$	—	$	145	Accrued expenses and other current liabilities	$	—	$	—
Interest rate swaps, long-term portion	Other assets	2,260		1,138		Other liabilities	186		—
Total derivative instruments designated as hedging instruments		$	2,260	$	1,283		$	186	$	—

We did not have any undesignated derivative instruments as of December 31, 2018 and 2017.

The effects of derivative instruments in cash flow hedging relationships were as follows:



	Gain (loss) recognized in accumulated other comprehensive loss as of		Location of gain (loss) reclassified from accumulated other comprehensive loss into income	Gain (loss) reclassified from accumulated other comprehensive loss into income
(dollars in thousands)	December 31, 2018			Year ended December 31, 2018
Interest rate swaps	$	2,074	Interest expense	$	118

	December 31, 2017			Year ended December 31, 2017
Interest rate swaps	$	1,283	Interest expense	$	(293	)

	December 31, 2016			Year ended December 31, 2016
Interest rate swaps	$	42	Interest expense	$	(1,106	)

Our policy requires that derivatives used for hedging purposes be designated and effective as a hedge of the identified risk exposure at the inception of the contract. Accumulated other comprehensive income (loss) includes unrealized gains or losses from the change in fair value measurement of our derivative instruments each reporting period and the related income tax expense or benefit. Changes in the fair value measurements of the derivative instruments and the related income tax expense or benefit are reflected as adjustments to accumulated other comprehensive income (loss) until the actual hedged expense is incurred or until the hedge is terminated at which point the unrealized gain (loss) is reclassified from accumulated other comprehensive income (loss) to current earnings. The estimated accumulated other comprehensive income as of December 31, 2018 that is expected to be reclassified into earnings within the next twelve months is $1.0 million. There were no ineffective portions of our interest rate swap derivatives during the years ended December 31, 2018, 2017 and 2016. See Note 14 to these consolidated financial statements for a summary of the changes in accumulated other comprehensive income (loss) by component.

We did not have any undesignated derivative instruments during 2018 and 2016. The effects of undesignated derivative instruments during 2017 were as follows:



	Location of gain (loss) recognized in income on derivative	Gain (loss) recognized in income
(dollars in thousands)	Location of gain (loss) recognized in income on derivative	Year ended December 31, 2017
Foreign currency option contracts	Other income (expense), net	$	513
Foreign currency forward contracts	Other income (expense), net	$	(51	)
Total gain⁽¹⁾		$	462

(1)

The individual amounts may not sum to total gain due to rounding.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

11. Commitments and Contingencies

Lease for New Headquarters Facility

In May 2016, we entered into a lease agreement for our New Headquarters Facility in Charleston, South Carolina. There are two phases for construction of the New Headquarters Facility. Phase One included a building with approximately 172,000 rentable square feet, which we began using in April 2018. The lease agreement also grants us a Phase Two option to request that the landlord construct and lease to us a second office building and related improvements. The current annual base rent for Phase One is $4.4 million, payable in equal monthly installments. The base rent escalates annually by approximately 2% based on the terms of the agreement. The lease agreement expires in April 2038 and provides for four renewal periods of five years each at a base rent equal to the then prevailing market rate for comparable buildings.

Other leases

We continue to lease our former headquarters facility, now called our Customer Operations Center, in Charleston, South Carolina. The lease expires in October 2023 and has two five-year renewal options. The current annual base rent of the lease is $4.3 million, payable in equal monthly installments. The base rent escalates annually at a rate equal to the change in the consumer price index, as defined in the agreement, but not to exceed 5.5% in any year.

We have a lease for office space in Austin, Texas which expires in September 2023 and has two five-year renewal options. The current annual base rent of the lease is $2.4 million. The base rent escalates annually between 2% and 4% based on the terms of the agreement. At December 31, 2018, we had a standby letter of credit of $1.0 million for a security deposit for this lease.

We have provisions in our leases that entitle us to aggregate remaining leasehold improvement allowances of $3.8 million as of December 31, 2018. These amounts are being recorded as a reduction to rent expense ratably over the terms of the leases. The leasehold improvement allowances have been included in the table of operating lease commitments below as a reduction in our lease commitments ratably over the then remaining terms of the leases. The timing of the reimbursements for the actual leasehold improvements may vary from the amounts reflected in the table below.

Additionally, we have subleased a portion of our facilities under various agreements through 2023. As of December 31, 2018, our total minimum rentals to be received in the future under noncancelable subleases was $7.2 million. These amounts are also being recorded as a reduction to rent expense.

Total rent expense was $22.2 million, $16.1 million and $11.7 million for the years ended December 31, 2018, 2017 and 2016, respectively.

The quarterly South Carolina state incentive payments we received as a result of locating our former headquarters facility in Berkeley County, South Carolina, ended in the fourth quarter of 2016. These amounts were recorded as a reduction of rent expense upon receipt and were $2.9 million for the year ended December 31, 2016. We expect to receive quarterly South Carolina state incentive payments as a result of locating our New Headquarters Facility in Berkeley County, South Carolina, which will be recorded as a reduction of rent expense upon receipt.

As of December 31, 2018, the future minimum lease payments related to lease agreements with a remaining noncancelable term in excess of one year, net of related sublease commitments and lease incentives, were as follows:



Years ending December 31, (dollars in thousands)	Operating leases⁽¹⁾
2019	$	20,808
2020	20,274
2021	16,924
2022	14,391
2023	12,923
Thereafter	81,755
Total minimum lease payments	$	167,075


(1)	Our future minimum lease commitments related to operating leases do not include payments related to Phase Two of our New Headquarters Facility, as that option had not been exercised as of December 31, 2018.

Other commitments

As discussed in Note 9 to these consolidated financial statements, the term loans under the 2017 Credit Facility require periodic principal payments. The balance of the term loans and any amounts drawn on the revolving credit loans are due upon maturity of the 2017 Credit Facility in June 2022.

We have contractual obligations for third-party technology used in our solutions and for other services we purchase as part of our normal operations. In certain cases, these arrangements require a minimum annual purchase commitment by us. As of December 31, 2018, the remaining aggregate minimum purchase commitment under these arrangements was approximately $109.9 million through 2023.

Solution and service indemnifications

In the ordinary course of business, we provide certain indemnifications of varying scope to customers against claims of intellectual property infringement made by third parties arising from the use of our solutions or services. If we determine that it is probable that a loss has been incurred related to solution or service indemnifications, any such loss that could be reasonably estimated would be recognized. We have not identified any losses and, accordingly, we have not recorded a liability related to these indemnifications.

Guarantees and indemnification obligations

We enter into agreements in the ordinary course of business with, among others, customers, creditors, vendors and service providers. Pursuant to certain of these agreements we have agreed to indemnify the other party for certain matters, such as property damage, personal injury, acts or omissions of ours, or our employees, agents or representatives, or third-party claims alleging that the activities of its contractual partner pursuant to the contract infringe a patent, trademark or copyright of such third party.

Legal proceedings

We are subject to legal proceedings and claims that arise in the ordinary course of business. We make a provision for a loss contingency when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular case. Unless otherwise specifically disclosed in this note, we have determined as of December 31, 2018, that no provision for liability nor disclosure is required related to any claim against us because (a) there is not a reasonable possibility that a loss exceeding amounts already recognized (if any) may be incurred with respect to such claim; (b) a reasonably possible loss or range of loss cannot be estimated; or (c) such estimate is immaterial.

All legal costs associated with litigation are expensed as incurred. Litigation is inherently unpredictable. However, we believe that we have valid defenses with respect to the legal matters pending against us. It is possible, nevertheless, that our

consolidated financial position, results of operations or cash flows could be negatively affected in any particular period by an unfavorable resolution of one or more of such proceedings, claims or investigations.

Income Taxes

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Income Taxes

12. Income Taxes

We file income tax returns in the U.S. for federal and various state jurisdictions as well as in foreign jurisdictions including Canada, the United Kingdom, Australia, Ireland and Costa Rica. We are generally subject to U.S. federal income tax examination for calendar tax years 2015 through 2018 as well as state and foreign income tax examinations for various years depending on statutes of limitations of those jurisdictions. We are currently under U.S. federal income tax examination for the calendar year 2016.

In December 2017, the Tax Act was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S. international taxation from a worldwide tax system to a territorial system, and a one-time U.S. Federal transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017.

On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. During the third quarter of 2018, the Company finalized its calculation of the transition tax as of December 31, 2017, and the impact to our effective income tax rate was insignificant.

The Tax Act eliminates the exceptions for performance-based compensation and CFO compensation from the calculation under Section 162(m) of the Internal Revenue Code. A transition rule allows for the grandfathering of performance-based compensation pursuant to a written binding contract in effect as of November 2, 2017. On August 21, 2018, the Internal Revenue Service issued Notice 2018-68 providing guidance regarding amendments to Section 162(m) contained in the Tax Act, including application of the transition rule. As a result of this guidance, the Company finalized its calculations of the Section 162(m) deduction and the ending estimated deferred tax assets for the performance-based stock compensation and the bonus accrual, which resulted in an insignificant impact due to tax reform on our effective income tax rate.

In accordance with the closing of the measurement period under SAB 118, we finalized our provisional estimates as noted above. As additional regulations or guidance in relation to the Tax Act continue to be issued, we will analyze and record the necessary impacts in the quarter in which guidance is received.

The following summarizes the components of income tax expense:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Current taxes:
U.S. Federal	$	(1,088	)	$	2,565		$	4,808
U.S. State and local	1,182			(144		)	1,670
International	306			101			53
Total current taxes	400			2,522			6,531
Deferred taxes:
U.S. Federal	659			(17,128		)	4,782
U.S. State and local	45			398			304
International	(1,323		)	(1,084		)	329
Total deferred taxes	(619		)	(17,814		)	5,415
Total income tax provision	$	(219	)	$	(15,292	)	$	11,946

The following summarizes the components of income before provision for income taxes:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
U.S.	$	47,532		$	58,547		$	55,381
International	(2,910		)	(206		)	1,969
Income before provision for income taxes	$	44,622		$	58,341		$	57,350

A reconciliation between the effect of applying the federal statutory rate and the effective income tax rate used to calculate our income tax provision is as follows:



	Years ended December 31,
	2018		2017		2016
Federal statutory rate	21.0	%	35.0	%	35.0	%
Effect of:
State income taxes, net of federal benefit	4.1		1.8		4.2
Change in federal income tax rate applied to deferred tax balances	—		(43.1	)	—
Change in state income tax rate applied to deferred tax balances	(0.4	)	—		0.2
Unrecognized tax benefit	(2.6	)	1.5		0.1
State credits, net of federal benefit	(1.9	)	(1.4	)	(0.1	)
Change in valuation reserve (primarily state credit reserves)	0.4		(1.0	)	(1.4	)
Federal credits generated	(10.4	)	(5.8	)	(5.5	)
Foreign tax rate	0.2		0.2		(0.4	)
Acquisition costs	—		2.2		0.1
Section 162(m) limitation	4.2		2.5		1.5
Domestic production activities deduction	—		—		(1.1	)
Stock-based compensation	(17.4	)	(18.9	)	(12.1	)
FDII benefit	(0.7	)	—		—
Nondeductible meals, entertainment, and transportation	2.6		0.8		0.9
Other	0.4		—		(0.6	)
Income tax provision effective rate	(0.5	)%	(26.2	)%	20.8	%

The increase in our effective income tax rate in 2018, when compared to 2017, was primarily due to the impact of U.S. tax reform legislation enacted in December 2017. Our effective income tax rate in 2017 included the benefit attributable to the revaluation of our U.S. deferred tax assets and liabilities as of December 31, 2017, resulting from the reduced U.S. corporate federal income tax rate effective for tax years beginning after that date.

The increase in our effective income tax rate was partially offset by the impact of the benefit to income tax expense relating to stock-based compensation items, calculated prior to the impact of the U.S. federal corporate tax rate change as a result of the Tax Act. This favorable impact was attributable to an increase in the market price for shares of our common stock, as reported by Nasdaq, as well as an increase in the number of stock awards that vested and were exercised. The benefit to income tax expense relating to stock-based compensation during 2018 was reduced as a result of a decrease in the U.S. corporate tax rate.

The increase in our effective income tax rate was also partially offset by the impact of the lower U.S. federal corporate tax rate on pre-tax income and the release of our tax reserve due to the expiration of the federal statute of limitations for 2014.

The significant components of our deferred tax assets and liabilities were as follows:



	December 31,
(dollars in thousands)	2018			2017
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$	11,021		$	13,597
Federal, state and foreign tax credits	18,936			14,389
Intangible assets	1,041			693
Stock-based compensation	11,462			9,611
Accrued bonuses	973			1,001
Deferred revenue	854			505
Allowance for doubtful accounts	1,242			1,379
Other	5,607			4,770
Total deferred tax assets	51,136			45,945
Deferred tax liabilities relating to:
Intangible assets	(43,700		)	(47,997		)
Fixed assets	(4,444		)	(4,552		)
Costs of obtaining contracts	(19,573		)	(18,756		)
Capitalized software development costs	(19,469		)	(14,012		)
Other	(926		)	(995		)
Total deferred tax liabilities	(88,112		)	(86,312		)
Valuation allowance	(6,855		)	(7,205		)
Net deferred tax liability	$	(43,831	)	$	(47,572	)

As of December 31, 2018, our federal, foreign and state net operating loss carryforwards for income tax purposes were approximately $24.3 million, $24.5 million and $25.1 million, respectively. The federal and state net operating loss carryforwards are subject to various Internal Revenue Code limitations and applicable state tax laws. If not utilized, the federal net operating loss carryforwards will begin to expire in 2028 and the state net operating loss carryforwards will expire over various periods beginning in 2019. Our foreign net operating loss carryforwards have an unlimited carryforward period. As of December 31, 2018, our foreign tax credit carryforwards for income tax purposes were insignificant. Our federal tax credit carryforwards for income tax purposes were approximately $6.5 million. Our state tax credit carryforwards for income tax purposes were approximately $14.1 million, net of federal benefit. If not utilized, the federal tax credit carryforwards will begin to expire in 2036 and the state tax credit carryforwards will begin to expire in 2019. A portion of the foreign and state net operating loss carryforwards and state credit carryforwards have a valuation reserve due to management's uncertainty regarding the future ability to use such carryforwards.

The following table illustrates the change in our deferred tax asset valuation allowance:



Years ended December 31,	Balance at beginning of year		Acquisition- related change		Charges to expense			Balance at end of year
(dollars in thousands)
2018	$	7,205	$	16	$	(366	)	$	6,855
2017	6,994		—		211			7,205
2016	7,911		—		(917		)	6,994

The following table sets forth the change to our unrecognized tax benefit for the years ended December 31, 2018, 2017 and 2016:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Balance at December 31, 2017	$	5,160		$	3,145		$	3,024
Increases from prior period positions	104			1,860			23
Decreases in prior year positions	(413		)	(238		)	(17		)
Increases from current period positions	58			404			358
Lapse of statute of limitations	(1,205		)	(11		)	(243		)
Balance at December 31, 2018	$	3,704		$	5,160		$	3,145

The total amount of unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate was $3.3 million at December 31, 2018. Certain prior period amounts relating to our 2014 acquisitions are covered under indemnification agreements and, therefore, we have recorded a corresponding indemnification asset. We recognize accrued interest and penalties, if any, related to unrecognized tax benefits as a component of income tax expense. The total amount of accrued interest and penalties included in the consolidated balance sheet as of December 31, 2018 was $0.7 million. The total amount of accrued interest and penalties included in the consolidated balance sheet as of December 31, 2017 was $0.8 million. The total amount of interest and penalties included in the consolidated statements of comprehensive income as an increase or decrease in income tax expense for 2018, 2017 and 2016 was insignificant.

We have taken federal and state tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits might decrease within the next twelve months. This possible decrease could result from the expiration of statutes of limitations. The reasonably possible decrease at December 31, 2018 was $1.4 million.

For our undistributed earnings of foreign subsidiaries, which we do not consider to be significant, we concluded that these earnings would be permanently reinvested in the local jurisdictions and not repatriated to the United States. Accordingly, we have not provided for U.S. state income taxes and foreign withholding taxes on those undistributed earnings of our foreign subsidiaries. If some or all of such earnings were to be remitted, the amount of taxes payable would be insignificant.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2018

Stock-Based Compensation

13. Stock-based Compensation

Employee stock-based compensation plans

Under the 2016 Equity and Incentive Compensation Plan (the "2016 Equity Plan"), we may grant incentive stock options, nonstatutory stock options, stock appreciation rights, restricted stock, restricted stock units, other stock awards and cash incentive awards to employees, directors and consultants. We maintain other stock-based compensation plans including the 2008 Equity Incentive Plan (the “2008 Equity Plan”), under which no additional grants may be made, and the 2009 Equity Compensation Plan for Employees from Acquired Companies, under which we may grant shares of common stock to employees pursuant to employment contracts or other arrangements entered into in connection with past and future acquisitions.

In connection with the acquisition of Convio in May 2012, we maintain the Convio, Inc. 1999 Stock Option/Stock Issuance Plan, as amended (the “Convio 1999 Plan”) and Convio, Inc. 2009 Stock Incentive Plan, as amended (the “Convio 2009 Plan”), which we assumed upon the acquisition of Convio. Our Compensation Committee of the Board of Directors administers all of these plans and the stock-based awards are granted under terms determined by them.

The total number of authorized stock-based awards available under our plans was 4,347,224 as of December 31, 2018. We issue common stock from our pool of authorized stock upon exercise of stock options and stock appreciation rights, vesting of restricted stock units or upon granting of restricted stock.

Historically, we have issued four types of awards under these plans: restricted stock awards, restricted stock units, stock appreciation rights and stock options. The following table sets forth the number of awards outstanding for each award type as of:



	Outstanding at December 31,
Award type	2018	2017
Restricted stock awards	1,263,510	1,257,574
Restricted stock units	459,673	493,248
Stock appreciation rights	60,871	212,506
Stock options	836	2,050

The majority of the stock-based awards granted under these plans have a 10-year contractual term. Stock appreciation rights (“SARs”) have contractual lives of 7 years. Awards granted to our executive officers and certain members of management are subject to accelerated vesting upon a change in control as defined in the employees’ retention agreement.

Expense recognition

We recognize compensation expense associated with stock options and awards with performance or market based vesting conditions on an accelerated basis over the requisite service period of the individual grantees, which generally equals the vesting period. We recognize compensation expense associated with restricted stock awards and SARs on a straight-line basis over the requisite service period of the individual grantees, which generally equals the vesting period. We recognize the effect of awards for which the requisite service period is not rendered when the award is forfeited (that is, we recognize the effect of forfeitures in compensation cost when they occur). Previously recognized compensation cost for an award is reversed in the period that the award is forfeited.

Stock-based compensation expense is allocated to cost of revenue and operating expenses on the consolidated statements of comprehensive income based on where the associated employee’s compensation is recorded. The following table summarizes stock-based compensation expense:



	Years ended December 31,
(in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	2,464	$	1,627	$	1,676
Cost of one-time services and other	2,778		1,843		1,621
Total included in cost of revenue	5,242		3,470		3,297
Included in operating expenses:
Sales, marketing and customer success	9,285		6,381		3,844
Research and development	9,048		7,765		6,467
General and administrative	24,699		23,015		19,030
Total included in operating expenses	43,032		37,161		29,341
Total stock-based compensation expense	$	48,274	$	40,631	$	32,638

The total amount of compensation cost related to unvested awards not recognized was $74.1 million at December 31, 2018. It is expected that this amount will be recognized over a weighted average period of 1.7 years.

Restricted stock awards

We have granted shares of common stock subject to certain restrictions under the 2016 Equity Plan and the 2008 Equity Plan. Restricted stock awards granted to employees vest in equal annual installments generally over four years from the grant date subject to the recipient’s continued employment with us. Restricted stock awards granted to non-employee

directors vest after one year from the date of grant or, if earlier, immediately prior to the next annual election of directors, provided the non-employee director is serving as a director at that time. The fair market value of the stock at the time of the grant is amortized on a straight-line basis to expense over the period of vesting. Recipients of restricted stock awards have the right to vote such shares and receive dividends.

The following table summarizes our unvested restricted stock awards as of December 31, 2018, and changes during the year then ended:



Restricted stock awards	Restricted stock awards		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	1,257,574		$	61.00
Granted	541,786		94.51
Vested	(420,688	)	57.56
Forfeited	(115,162	)	72.93
Unvested at December 31, 2018	1,263,510		75.46		8.1	$	79,475


(1)	The intrinsic value is calculated as the market value as of the end of the fiscal period.

The total fair value of restricted stock awards that vested during the years ended December 31, 2018, 2017 and 2016 was $24.2 million, $19.4 million and $14.5 million, respectively. The weighted average grant-date fair value of restricted stock awards granted during the years ended December 31, 2017 and 2016 was $74.08 and $53.59, respectively.

Restricted stock units

We have also granted restricted stock units subject to certain restrictions under the 2016 Equity Plan and the 2008 Equity Plan. Restricted stock units granted to employees vest in equal annual installments generally over three years from the grant date subject to the recipient’s continued employment with us. We have also granted restricted stock units for which vesting is subject to meeting certain performance and/or market conditions. Restricted stock units granted with a market condition had a fair market value assigned at the grant date based on the use of a Monte Carlo simulation model. The fair market value of the stock at the time of the grant is amortized to expense on a straight-line basis over the period of vesting except for awards with market or performance conditions, which are amortized on an accelerated basis over the period of vesting.

The following table summarizes our unvested restricted stock units as of December 31, 2018, and changes during the year then ended:



Restricted stock units	Restricted stock units		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	493,248		$	61.05
Granted	231,491		95.59
Forfeited	(24,507	)	79.85
Vested	(240,559	)	56.77
Unvested at December 31, 2018	459,673		79.78		8.4	$	28,913


(1)	The intrinsic value is calculated as the market value as of the end of the fiscal period.

The total fair value of restricted stock units that vested during the years ended December 31, 2018, 2017 and 2016 was $13.7 million, $9.4 million, and $6.7 million, respectively. The weighted average grant date fair value of restricted stock units granted for the years ended December 31, 2017 and 2016 was $72.19 and $51.98, respectively.

Stock appreciation rights

We have granted SARs under the 2008 Equity Plan to certain members of management. The SARs will be settled in stock at the time of exercise and vest in equal annual installments generally over four years from the date of grant subject to the recipient’s continued employment with us. The number of shares issued upon the exercise of the SARs is calculated as the difference between the share price of our stock on the date of exercise and the date of grant multiplied by the number of SARs divided by the share price on the exercise date.

The following table summarizes our outstanding SARs as of December 31, 2018, and changes during the year then ended:



Stock appreciation rights	Stock appreciation rights		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	212,506		$	23.01
Exercised	(151,635	)	23.31
Outstanding at December 31, 2018	60,871		22.24		0.8	$	2,475
Vested and exercisable at December 31, 2018	60,871		22.24		0.8	2,475


(1)	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

There have been no new SARs granted since 2013 and all outstanding SARs were fully vested as of December 31, 2017. The total intrinsic value of SARs exercised during the years ended December 31, 2018, 2017 and 2016 was $12.4 million, $14.2 million, and $10.7 million, respectively. The total fair value of SARs that vested during the year ended December 31, 2017 was insignificant. The total fair value of SARs that vested during the year ended December 31, 2016 was $1.0 million. SARs granted with a market condition had a fair market value assigned at the grant date based on the use of a Monte Carlo simulation model. All other SARs granted had a fair market value assigned at the grant date based on the use of the Black-Scholes option pricing model.

Stock options

The following table summarizes our outstanding stock options as of December 31, 2018, and changes during the year then ended:



Stock options	Stock options		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	2,050		$	11.44
Exercised	(1,032	)	10.53
Expired	(182	)	10.59
Outstanding at December 31, 2018	836		12.75		0.7	$	42
Vested and exercisable at December 31, 2018	836		12.75		0.7	42


(1)	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

There have been no new stock option awards granted since 2005 and all outstanding stock options were fully vested as of December 31, 2010. The total intrinsic value of stock options exercised during the years ended December 31, 2018, 2017 and 2016 was insignificant. All outstanding stock options granted had a fair market value assigned at the grant date based on the use of the Black-Scholes option pricing model.

Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Defined Contribution Plan

Stockholders' Equity

14. Stockholders' Equity

Preferred stock

Our Board of Directors may fix the relative rights and preferences of each series of preferred stock in a resolution of the Board of Directors.

Dividends

Our Board of Directors has adopted a dividend policy, which provides for the distribution to stockholders a portion of cash generated by us that is in excess of operational needs and capital expenditures. The 2017 Credit Facility limits the amount of dividends payable and certain state laws restrict the amount of dividends distributed.

The following table provides information with respect to quarterly dividends paid on common stock during the year ended December 31, 2018.



Declaration Date	Dividend per Share		Record Date	Payable Date
February 6, 2018	$	0.12	February 28	March 15
April 30, 2018	0.12		May 25	June 15
July 30, 2018	0.12		August 28	September 14
October 29, 2018	0.12		November 28	December 14

On February 6, 2019, our Board of Directors declared a first quarter 2019 dividend of $0.12 per share payable on March 15, 2019 to stockholders of record on February 27, 2019.

Stock repurchase program

In August 2010, our Board of Directors approved a stock repurchase program that authorized us to purchase up to $50.0 million of our outstanding shares of common stock. The program does not have an expiration date. The shares can be purchased from time to time on the open market or in privately negotiated transactions depending upon market conditions and other factors. Under the 2017 Credit Facility, we also have restrictions on our ability to repurchase shares of our common stock.

We account for purchases of treasury stock under the cost method. The remaining amount available to purchase stock under the stock repurchase program was $50.0 million as of December 31, 2018.

Changes in accumulated other comprehensive loss by component

The changes in accumulated other comprehensive loss by component, consisted of the following:



	Years ended December 31,
(in thousands)	2018			2017			2016
Accumulated other comprehensive loss, beginning of period	$	(642	)	$	(604	)	$	(825	)
By component:
Gains and losses on cash flow hedges:
Accumulated other comprehensive income (loss) balance, beginning of period	$	748		$	(3	)	$	(19	)
Other comprehensive income (loss) before reclassifications, net of tax effects of $(239), $(374) and $406	670			574			(626		)
Amounts reclassified from accumulated other comprehensive loss to interest expense	(118		)	293			1,106
Tax benefit included in provision for income taxes	31			(116		)	(436		)
Total amounts reclassified from accumulated other comprehensive loss	(87		)	177			670
Net current-period other comprehensive income	583			751			44
Cumulative effect of adoption of ASU 2014-09	—			—			(28		)
Reclassification upon early adoption of ASU 2018-02	167			—			—
Accumulated other comprehensive income (loss) balance, end of period	$	1,498		$	748		$	(3	)
Foreign currency translation adjustment:
Accumulated other comprehensive loss balance, beginning of period	$	(1,390	)	$	(601	)	$	(806	)
Translation adjustments	(5,218		)	(789		)	205
Accumulated other comprehensive loss balance, end of period	(6,608		)	(1,390		)	(601		)
Accumulated other comprehensive loss, end of period	$	(5,110	)	$	(642	)	$	(604	)

Defined Contribution Plan

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

15. Defined Contribution Plan

We have a defined contribution 401(k) plan (the "401K Plan") covering substantially all employees. Employees were able to contribute between 1% and 75% of their salaries in 2018, 2017 and 2016. We match 50% of qualified employees’ contributions up to 6% of their salary. The 401K Plan also provides for additional employer contributions to be made at our discretion. Total matching contributions to the 401K Plan for the years ended December 31, 2018, 2017 and 2016 were $8.1 million, $7.1 million and $7.6 million, respectively. There were no discretionary contributions by us to the 401K Plan in 2018, 2017 and 2016.

Segment Information

12 Months Ended

Dec. 31, 2018

Segment Information

16. Segment Information

Our chief operating decision maker is our chief executive officer ("CEO"). Our chief operating decision maker uses consolidated financial information to make operating decisions, assess financial performance and allocate resources. We have one operating segment and one reportable segment.

The following table presents long-lived assets by geographic region based on the location of the assets.



	Years ended December 31,
(dollars in thousands)	2018		2017
United States	$	37,015	$	39,071
Other countries	3,016		3,172
Total property and equipment	$	40,031	$	42,243

See Note 17 to these consolidated financial statements for information about our revenues by geographic region.

Revenue Recognition

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer

17. Revenue Recognition

The prior period financial information presented below has been adjusted to reflect our adoption of ASU 2014-09.

Transaction price allocated to the remaining performance obligations

As of December 31, 2018, approximately $738 million of revenue is expected to be recognized from remaining performance obligations. We expect to recognize revenue on approximately 60% of these remaining performance obligations over the next 12 months, with the remainder recognized thereafter.

We applied the practical expedient in ASC 606-10-50-14 and have excluded the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less (one-time services); and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed (payment services and usage).

We also applied the practical expedient in ASC 606-10-65-1-(f)(3), whereby the transaction price allocated to the remaining performance obligations, or an explanation of when we expect to recognize that amount as revenue for all reporting periods presented before the date of the initial application, is not disclosed.

Contract balances

Our opening and closing balances of contract assets and deferred revenue were as follows:



(in thousands)	December 31, 2018		December 31, 2017
Contract assets⁽¹⁾	$	308	$	—
Total deferred revenue	298,555		278,706


(1)	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable. See Note 8 to these consolidated financial statements for additional details.

Contract assets increased during the year ended December 31, 2018 primarily as a result of incremental revenue recognized in excess of amounts billed. The increase in deferred revenue during the year ended December 31, 2018 was primarily due to new subscription sales of our cloud-based solutions, and to a much lesser extent, the inclusion of Reeher. We also sold more subscription-based contracts for professional services and services embedded in our renewable cloud-based solution contracts.

The amount of revenue recognized during the year ended December 31, 2018 that was included in the deferred revenue balance at the beginning of the period was approximately $270 million. The amount of revenue recognized during the year ended December 31, 2018 from performance obligations satisfied in prior periods was insignificant.

Disaggregation of revenue

We sell our cloud-based solutions and related services in two primary geographical markets: to customers in the United States, and to customers located outside of the United States. The following table presents our revenue by geographic area based on the address of our customers:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
United States	$	727,366	$	706,904	$	661,143
Other countries	121,240		81,583		70,499
Total revenue	$	848,606	$	788,487	$	731,642

The General Markets Group ("GMG"), the Enterprise Markets Group ("EMG"), and the International Markets Group ("IMG") comprise our go-to-market organizations. The following is a description of each market group as of December 31, 2018:


•	The GMG focuses on sales to all K-12 private schools, faith communities and arts and cultural organizations, as well as emerging and mid-sized prospects in North America;


•	The EMG focuses on sales to all healthcare and higher education institutions, corporations and foundations, as well as large and/or strategic prospects in North America; and


•	The IMG focuses on sales to all prospects and customers outside of North America.

Beginning in the first quarter of 2019, all of our Canadian operations will be included in the IMG.

The following table presents our revenue by market group:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
GMG	$	387,630	$	373,108	$	340,644
EMG	375,861		367,203		346,781
IMG	81,160		45,682		42,291
Other	3,955		2,494		1,926
Total revenue	$	848,606	$	788,487	$	731,642

Quarterly Results (unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results

18. Quarterly Results (Unaudited)



(dollars in thousands, except per share data)	December 31, 2018		September 30, 2018		June 30, 2018		March 31, 2018
Total revenue	$	221,218	$	209,532	$	213,672	$	204,184
Gross profit	117,922		114,295		118,500		116,147
Income from operations	14,679		15,783		11,374		17,581
Income before provision for income taxes	11,485		11,496		7,417		14,224
Net income	9,334		11,164		6,592		17,751
Earnings per share
Basic	$	0.20	$	0.24	$	0.14	$	0.38
Diluted	0.19		0.23		0.14		0.37

(dollars in thousands, except per share data)	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
Total revenue	$	217,402	$	194,424	$	191,589	$	185,072
Gross profit	114,980		107,419		104,594		99,590
Income from operations	19,959		18,423		16,523		13,273
Income before provision for income taxes	17,226		15,799		14,134		11,182
Net income	36,638		12,824		11,029		13,142
Earnings per share
Basic	$	0.78	$	0.27	$	0.24	$	0.28
Diluted	0.76		0.27		0.23		0.28

Note: The individual amounts for each quarter may not sum to full year totals due to rounding.

The results of operations of acquired companies are included in the consolidated results of operations from the date of their respective acquisition. See Note 3 of these consolidated financial statements for details related to our business acquisitions.

Restructuring

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring

19. Restructuring

During 2017, in an effort to further our organizational objectives including, improved operating efficiency, customer outcomes and employee satisfaction, we initiated a multi-year plan to consolidate and relocate some of our existing offices to highly modern and more collaborative workspaces with short-term financial commitments. These workspaces are also more centrally located for our employees and closer to our customers and prospects. Restructuring costs incurred to date and expected to be incurred consist primarily of costs to terminate existing lease agreements, contractual lease payments, net of estimated sublease income, upon vacating space as part of the plan, as well as costs to relocate affected employees and write-off leasehold improvement assets that we will no longer use. We currently expect to incur before-tax restructuring costs associated with these activities of between $8.5 million and $9.5 million, of which $5.4 million have been incurred through 2018. We expect that a significant portion of the remaining costs expected will be incurred in 2019. Our updated estimates reflect the more aggressive actions taken to relocate and consolidate some of our offices than we had originally anticipated. We also expect to incur employee severance costs related to the plan; however, these costs cannot be reasonably estimated at this time.

The following table summarizes our facilities optimization restructuring costs as of December 31, 2018:



	Costs incurred during the year ended		Cumulative costs incurred as of
(in thousands)	December 31, 2018
By component:
Contract termination costs	$	3,581	$	4,176
Other costs	1,009		1,208
Total	$	4,590	$	5,384

The change in our liability related to our facilities optimization restructuring during the twelve months ended December 31, 2018, consisted of the following:



	Accrued at		Increases for incurred costs		Costs paid			Accrued at
(in thousands)	December 31, 2017		Increases for incurred costs		Costs paid			December 31, 2018
By component:
Contract termination costs	$	691	$	3,581	$	(2,407	)	$	1,865
Other costs	—		1,009		(959		)	50
Total	$	691	$	4,590	$	(3,366	)	$	1,915

Subsequent Events

12 Months Ended

Dec. 31, 2018

Subsequent Events [Abstract]

Subsequent Events [Text Block]

20. Subsequent Events

YourCause acquisition

On January 2, 2019, we acquired all of the outstanding equity securities, including all voting equity interests, of YourCause Holdings, LLC, a Delaware limited liability company ("YourCause"), pursuant to a purchase agreement and plan of merger. The acquisition expands our footprint in corporate social responsibility and employee engagement and enhances our position as a leader in providing solutions to both nonprofit organizations and for-profit companies committed to addressing social issues. We acquired the equity securities for an aggregate purchase price of $157.0 million in cash, subject to certain adjustments set forth in the agreement and plan of merger. The purchase price and related expenses were funded primarily through borrowings under the 2017 Credit Facility. As a result of the acquisition, YourCause has become a wholly-owned subsidiary of ours. We will include the operating results of YourCause, as well as the assets acquired, liabilities assumed and any goodwill arising from the acquisition, in our consolidated financial statements from the date of the acquisition. During the three months ended December 31, 2018, we incurred insignificant acquisition-related expenses associated with the acquisition, which were recorded in general and administrative expense. Due to the timing of the transaction, the initial accounting for this acquisition, including the measurement of assets acquired, liabilities assumed and goodwill, is not complete and is pending detailed analyses of the facts and circumstances that existed as of the January 2, 2019 acquisition date.

Basis of Presentation (Policy)

12 Months Ended

Dec. 31, 2018

Basis of presentation

Basis of presentationThe consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”).

Basis of consolidation

Basis of consolidationThe consolidated financial statements include the accounts of Blackbaud, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of estimates

Use of estimatesThe preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. On an ongoing basis, we reconsider and evaluate our estimates and assumptions, including those that impact revenue recognition, long-lived and intangible assets including goodwill, income taxes, business combinations, stock-based compensation, capitalization of software development costs, our allowances for sales returns and doubtful accounts, costs of obtaining contracts, valuation of derivative instruments and loss contingencies, among others. Changes in the facts or circumstances underlying these estimates could result in material changes and actual results could materially differ from these estimates.

Revenue recognition

We determine revenue recognition through the following steps:

•Identification of the contract, or contracts, with a customer;

•Identification of the performance obligations in the contract;

•Determination of the transaction price;

•Allocation of the transaction price to the performance obligations in the contract; and

•Recognition of revenue when, or as, we satisfy a performance obligation.

Recurring

One-time services and other

One-time services and other revenue primarily consists of fees for one-time consulting, analytic and onsite training services.

Contracts with multiple performance obligations

Costs of obtaining contracts, contract assets and deferred revenue

Fair value measurements


•	Level 1 - Quoted prices for identical assets or liabilities in active markets;


•	Level 2 - Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets in markets that are not active, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets; and


•	Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are unobservable.

Cash and cash equivalents

Sales taxes

Sales taxesWe present sales taxes and other taxes collected from customers and remitted to governmental authorities on a net basis and, as such, exclude them from revenues.

Cash and cash equivalentsWe consider all highly liquid investments purchased with an original maturity of three months or less and cash items in transit to be cash equivalents.

Restricted cash due to customers; due to customers

Restricted cash due to customers; Customer funds receivable; Due to customersRestricted cash due to customers consists of monies collected by us and payable to our customers, net of the associated transaction fees earned. Monies associated with amounts due to customers are segregated in separate bank accounts and used exclusively for the payment of amounts due to customers. This usage restriction is either legally or internally imposed and reflects our intention with regard to such deposits. Customer funds receivable consists of monies we expect to collect and remit to our customers.

Concentration of credit risk

Concentration of credit riskFinancial instruments that potentially subject us to concentrations of credit risk consist of cash and cash equivalents, restricted cash due to customers and accounts receivable. Our cash and cash equivalents and restricted cash due to customers are placed with high credit-quality financial institutions. Our accounts receivable is derived from sales to customers who primarily operate in the nonprofit sector. With respect to accounts receivable, we perform ongoing evaluations of our customers and maintain an allowance for doubtful accounts based on historical experience and our expectations of future losses.

Property and equipment

Business combinations

Goodwill

Intangible assets

Intangible assets other than goodwill

We amortize finite-lived intangible assets over their estimated useful lives as follows.



	Basis of amortization	Amortization period (in years)
Customer relationships	Straight-line and accelerated⁽¹⁾	4-17
Marketing assets	Straight-line	1-15
Acquired software and technology	Straight-line and accelerated⁽¹⁾	1-11
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Deferred financing costs

Deferred financing costsDeferred financing costs included in other assets represent the direct third-party costs of entering into the revolving (line-of-credit) portion of our credit facility in June 2017 and portions of the unamortized deferred financing costs from prior facilities. These costs are amortized ratably over the term of the credit facility as interest expense.

Stock-based compensation

Income taxes

Foreign currency

Research and development

Research and developmentResearch and development costs are expensed as incurred. These costs include compensation costs for engineering and product management personnel, third-party contractor expenses, software development tools and other expenses related to researching and developing new solutions, upgrading and enhancing existing solutions, and allocated depreciation, facilities and IT support costs.

Software development costs, software for internal use

Software development costs

Software development costs, software to be sold

Historically, we have also incurred and capitalized costs in connection with the development of certain of our software solutions licensed to customers on a perpetual basis, which are accounted for as costs of software to be sold, leased or otherwise marketed; however, there were no costs capitalized related to those solutions as of December 31, 2018 and 2017. Qualifying capitalized software development costs are amortized on a straight-line basis over the software asset's estimated useful life, which is generally three to seven years. We evaluate the useful lives of these assets on an annual basis and test for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.

Sales returns and allowance for doubtful accounts

Sales returns and allowance for doubtful accountsWe maintain a reserve for returns and credits which is estimated based on several factors including historical experience, known credits yet to be issued, the aging of customer accounts and the nature of service level commitments. A considerable amount of judgment is required in assessing these factors. Provisions for sales returns and credits are charged against the related revenue items.

Accounts receivable

Advertising costs

Advertising costsWe expense advertising costs as incurred

Restructuring costs

Restructuring costsRestructuring costs include charges for the costs of exit or disposal activities. The liability for costs associated with exit or disposal activities is measured initially at fair value and only recognized when the liability is incurred.

Impairment of long-lived assets

Impairment of long-lived assetsWe review long-lived assets for impairment when events change or circumstances indicate the carrying amount may not be recoverable. Events or changes in circumstances that indicate the carrying amount may not be recoverable include, but are not limited to, a significant decrease in the market value of the business or asset acquired, a significant adverse change in the extent or manner in which the business or asset acquired is used or significant adverse change in the business climate. If such events or changes in circumstances are present, the undiscounted cash flow method is used to determine whether the asset is impaired.

Contingencies

ContingenciesWe are subject to the possibility of various loss contingencies in the normal course of business. We record an accrual for a contingency when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Often these issues are subject to substantial uncertainties and, therefore, the probability of loss and the estimation of damages are difficult to ascertain. These assessments can involve a series of complex judgments about future events and can rely heavily on estimates and assumptions that have been deemed reasonable by us. Although we believe we have substantial defenses in these matters, we could incur judgments or enter into settlements of claims that could have a material adverse effect on our consolidated financial position, results of operations or cash flows in any particular period.

Earnings per share

Earnings per shareWe compute basic earnings per share by dividing net income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average number of common shares and dilutive potential common shares outstanding during the period. Diluted earnings per share reflect the assumed exercise, settlement and vesting of all dilutive securities using the “treasury stock method” except when the effect is anti-dilutive. Potentially dilutive securities consist of shares issuable upon the exercise of stock options and stock appreciation rights and vesting of restricted stock awards and units.

Recently adopted accounting pronouncements

Select adjusted financial statement information, which reflects our adoption of ASU 2014-09 is set forth below.



Consolidated balance sheets:
	As of December 31, 2016							As of December 31, 2017
(dollars in thousands)	As Reported		Adjustments			As Adjusted		As Reported		Adjustments			As Adjusted
Accounts receivable, net of allowance	$	88,932	$	(671	)	$	88,261	$	96,293	$	(614	)	$	95,679
Prepaid expenses and other current assets	$	48,314	$	5,897		$	54,211	$	56,099	$	5,879		$	61,978
Other assets	$	22,524	$	29,573		$	52,097	$	24,083	$	33,155		$	57,238
Deferred revenue, current portion	$	244,500	$	(651	)	$	243,849	$	276,456	$	(1,393	)	$	275,063
Deferred tax liability	$	29,558	$	13,917		$	43,475	$	37,597	$	10,426		$	48,023
Retained earnings	$	152,729	$	21,680		$	174,409	$	195,649	$	29,380		$	225,029



Consolidated statements of comprehensive income:
	Year ended December 31, 2016							Year ended December 31, 2017
(dollars in thousands, except per share amounts)	As Reported⁽¹⁾		Adjustments			As Adjusted		As Reported⁽¹⁾		Adjustments			As Adjusted
Revenue
Recurring	$	575,933	$	33,130		$	609,063	$	651,031	$	33,552		$	684,583
One-time services and other	154,882		(32,303		)	122,579		137,275		(33,371		)	103,904
Total revenue	$	730,815	$	827		$	731,642	$	788,306	$	181		$	788,487
Cost of revenue
Recurring	$	235,977	$	10,692		$	246,669	$	265,713	$	11,926		$	277,639
One-time services and other	103,243		(10,692		)	92,551		96,191		(11,926		)	84,265
Total cost of revenue	$	339,220	$	—		$	339,220	$	361,904	$	—		$	361,904
Operating expenses
Sales, marketing and customer success	$	155,754	$	(5,597	)	$	150,157	$	173,525	$	(3,966	)	$	169,559
Net income	$	41,515	$	3,889		$	45,404	$	65,933	$	7,700		$	73,633
Basic earnings per share	$	0.90	$	0.08		$	0.98	$	1.41	$	0.17		$	1.58
Diluted earnings per share	$	0.88	$	0.08		$	0.96	$	1.38	$	0.16		$	1.54


(1)	See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Our adoption of ASU 2014-09 had no impact on our net cash provided by or used in operating, investing or financing activities for any of the periods reported.

Recently issued accounting pronouncements

Recently issued accounting pronouncementsIn February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 will require lessees to record most leases on their balance sheets but recognize expenses in the income statement in a manner similar to current guidance. The updated guidance also eliminates certain real estate-specific provisions and changes the guidance on sale-leaseback transactions, initial direct costs and lease executory costs for all entities. All entities will classify leases to determine how to recognize lease-related revenue and expense. Upon adoption, entities will be required to use a modified retrospective approach with an option to use certain practical expedients. We expect to adopt ASU 2016-02 when effective, using the transition method that allows us to initially apply the guidance at the adoption date of January 1, 2019 and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We expect to use the package of practical expedients that allows us to not reassess: (1) whether any expired or existing contracts are or contain leases, (2) lease classification for any expired or existing leases and (3) initial direct costs for any expired or existing leases. We expect ASU 2016-02 will impact our consolidated financial statements and related disclosures. We are currently evaluating the extent of the impact and expect that most of our lease commitments will be subject to the updated guidance and recognized as lease liabilities and right-of-use assets on our consolidated balance sheets upon adoption.

Legal contingencies

Legal proceedingsWe are subject to legal proceedings and claims that arise in the ordinary course of business. We make a provision for a loss contingency when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Finite-Lived Intangible Assets

We amortize finite-lived intangible assets over their estimated useful lives as follows.



	Basis of amortization	Amortization period (in years)
Customer relationships	Straight-line and accelerated⁽¹⁾	4-17
Marketing assets	Straight-line	1-15
Acquired software and technology	Straight-line and accelerated⁽¹⁾	1-11
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8

(1)

Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Schedule of Changes in Allowance for Sales Returns and Doubtful Accounts

Below is a summary of the changes in our allowance for sales returns.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	4,400	$	4,952	$	(5,975	)	$	3,377
2017	2,704		10,511		(8,815		)	4,400
2016	4,431		3,060		(4,787		)	2,704

Below is a summary of the changes in our allowance for doubtful accounts.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	741	$	2,446	$	(1,842	)	$	1,345
2017	587		1,148		(994		)	741
2016	512		499		(424		)	587

Adoption of New Standard Impact on Previously Reported Quarterly Results

Select adjusted financial statement information, which reflects our adoption of ASU 2014-09 is set forth below.



Consolidated balance sheets:
	As of December 31, 2016							As of December 31, 2017
(dollars in thousands)	As Reported		Adjustments			As Adjusted		As Reported		Adjustments			As Adjusted
Accounts receivable, net of allowance	$	88,932	$	(671	)	$	88,261	$	96,293	$	(614	)	$	95,679
Prepaid expenses and other current assets	$	48,314	$	5,897		$	54,211	$	56,099	$	5,879		$	61,978
Other assets	$	22,524	$	29,573		$	52,097	$	24,083	$	33,155		$	57,238
Deferred revenue, current portion	$	244,500	$	(651	)	$	243,849	$	276,456	$	(1,393	)	$	275,063
Deferred tax liability	$	29,558	$	13,917		$	43,475	$	37,597	$	10,426		$	48,023
Retained earnings	$	152,729	$	21,680		$	174,409	$	195,649	$	29,380		$	225,029



Consolidated statements of comprehensive income:
	Year ended December 31, 2016							Year ended December 31, 2017
(dollars in thousands, except per share amounts)	As Reported⁽¹⁾		Adjustments			As Adjusted		As Reported⁽¹⁾		Adjustments			As Adjusted
Revenue
Recurring	$	575,933	$	33,130		$	609,063	$	651,031	$	33,552		$	684,583
One-time services and other	154,882		(32,303		)	122,579		137,275		(33,371		)	103,904
Total revenue	$	730,815	$	827		$	731,642	$	788,306	$	181		$	788,487
Cost of revenue
Recurring	$	235,977	$	10,692		$	246,669	$	265,713	$	11,926		$	277,639
One-time services and other	103,243		(10,692		)	92,551		96,191		(11,926		)	84,265
Total cost of revenue	$	339,220	$	—		$	339,220	$	361,904	$	—		$	361,904
Operating expenses
Sales, marketing and customer success	$	155,754	$	(5,597	)	$	150,157	$	173,525	$	(3,966	)	$	169,559
Net income	$	41,515	$	3,889		$	45,404	$	65,933	$	7,700		$	73,633
Basic earnings per share	$	0.90	$	0.08		$	0.98	$	1.41	$	0.17		$	1.58
Diluted earnings per share	$	0.88	$	0.08		$	0.96	$	1.38	$	0.16		$	1.54

(1)

See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2018

Business Acquisition [Line Items]

Purchase Price Allocation



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	1,683
Property and equipment	755
Identifiable intangible assets	27,055
Deferred tax asset	713
Deferred revenue	(2,700		)
Goodwill	13,681
Total purchase price	$	41,187

Acquired Intangible Assets

The Reeher acquisition resulted in the identification of the following identifiable intangible assets:



	Intangible assets acquired		Weighted average amortization period
Reeher	(in thousands)		(in years)
Acquired technology	$	19,500	11
Customer relationships	7,000		10
Marketing assets	480		3
Non-compete agreements	75		2
Total intangible assets	$	27,055	11

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

The change in our goodwill during 2018 consisted of the following:



(dollars in thousands)	Total
Balance at December 31, 2017	$	530,249
Additions related to current year business combinations	18,271
Adjustments related to prior year business combinations	(333		)
Effect of foreign currency translation	(2,974		)
Balance at December 31, 2018	$	545,213

Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class

The table below sets forth the balances of each class of intangible asset and related amortization as of:



	December 31,
(dollars in thousands)	2018			2017
Finite-lived gross carrying amount
Customer relationships	$	280,309		$	274,458
Marketing assets	48,484			49,661
Acquired software and technology	211,654			193,010
Non-compete agreements	2,499			2,603
Database	4,275			4,275
Total finite-lived gross carrying amount	547,221			524,007
Accumulated amortization
Customer relationships	(116,648		)	(96,662		)
Marketing assets	(16,395		)	(12,444		)
Acquired software and technology	(118,268		)	(96,528		)
Non-compete agreements	(1,618		)	(1,125		)
Database	(4,275		)	(4,197		)
Total accumulated amortization	(257,204		)	(210,956		)
Indefinite-lived gross carrying amount
Marketing assets	1,600			1,600
Intangible assets, net	$	291,617		$	314,651

Summary of Amortization Expense

The following table summarizes amortization expense of our finite-lived intangible assets:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	39,877	$	37,557	$	36,597
Cost of one-time services and other	2,356		2,542		2,961
Total included in cost of revenue	42,233		40,099		39,558
Included in operating expenses	4,844		3,271		2,840
Total amortization of intangibles from business combinations	$	47,077	$	43,370	$	42,398

Future Amortization Expense for Finite-Lived Intangible Assets

The following table outlines the estimated future amortization expense for each of the next five years for our finite-lived intangible assets as of December 31, 2018:



Years ending December 31, (dollars in thousands)	Amortization expense
2019	$	45,266
2020	36,995
2021	31,453
2022	27,969
2023	26,213
Total	$	167,896

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:



	Years ended December 31,
(dollars in thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	44,841	$	73,633	$	45,404
Denominator:
Weighted average common shares	47,206,669		46,669,440		46,132,389
Add effect of dilutive securities:
Stock-based awards	838,415		1,106,262		1,184,149
Weighted average common shares assuming dilution	48,045,084		47,775,702		47,316,538
Earnings per share:
Basic	$	0.95	$	1.58	$	0.98
Diluted	$	0.93	$	1.54	$	0.96

Anti-dilutive shares excluded from calculations of diluted earnings per share	48,881		4,634		7,339

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities that are measured at fair value on a recurring basis consisted of the following, as of the dates indicated below:



	Fair value measurement using
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Fair value as of December 31, 2018
Financial assets:
Derivative instruments	$	—	$	2,260	$	—	$	2,260
Total financial assets	$	—	$	2,260	$	—	$	2,260

Fair value as of December 31, 2018
Financial liabilities:
Derivative instruments	$	—	$	186	$	—	$	186
Total financial liabilities	$	—	$	186	$	—	$	186

Fair value as of December 31, 2017
Financial assets:
Derivative instruments	$	—	$	1,283	$	—	$	1,283
Total financial assets	$	—	$	1,283	$	—	$	1,283

Property and Equipment and Software Development Costs (Tables)

12 Months Ended

Dec. 31, 2018

Property and equipment [Member]

Software development [Member]

Property and equipment consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Equipment	2 - 5	$	4,243		$	2,728
Computer hardware	2 - 5	75,060			76,331
Computer software	2 - 5	34,294			34,058
Construction in progress	—	233			3,102
Furniture and fixtures	3 - 10	7,004			7,265
Leasehold improvements	Lesser of lease term or 10 years	26,795			22,359
Total property and equipment		147,629			145,843
Less: accumulated depreciation		(107,598		)	(103,600		)
Property and equipment, net		$	40,031		$	42,243

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Software development costs consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Software development costs	3 - 7	$	121,983		$	84,404
Less: accumulated amortization		(46,884		)	(30,306		)
Software development costs, net		$	75,099		$	54,098

Consolidated Financial Statement Details (Tables)

12 Months Ended

Dec. 31, 2018

Components of Prepaid Expenses and Other Assets

Prepaid expenses and other assets



(dollars in thousands)	December 31, 2018		December 31, 2017
Costs of obtaining contracts⁽¹⁾⁽²⁾	$	85,590	$	77,312
Prepaid software maintenance and subscriptions	21,134		17,402
Taxes, prepaid and receivable	2,055		10,548
Derivative instruments	2,260		1,283
Unbilled accounts receivable⁽³⁾	4,161		3,136
Security deposits	1,020		2,305
Other assets	8,931		7,230
Total prepaid expenses and other assets	125,151		119,216
Less: Long-term portion	65,363		57,238
Prepaid expenses and other current assets	$	59,788	$	61,978


(1)	Amortization expense from costs of obtaining contracts was $35.7 million for the year ended December 31, 2018.


(2)	The current portion of costs of obtaining contracts as of December 31, 2018 and 2017 was $31.7 million and $28.0 million, respectively.

(3)

Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable.

Components of Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities



(dollars in thousands)	December 31, 2018		December 31, 2017
Accrued bonuses	$	14,868	$	16,743
Accrued commissions and salaries	9,934		6,943
Taxes payable	6,204		5,517
Deferred rent liabilities	4,332		4,548
Customer credit balances	4,076		4,652
Lease incentive obligations	3,514		4,635
Unrecognized tax benefit	2,719		1,972
Accrued vacation costs	2,352		2,458
Accrued health care costs	1,497		2,615
Other liabilities	6,785		9,948
Total accrued expenses and other liabilities	56,281		60,031
Less: Long-term portion	9,388		5,632
Accrued expenses and other current liabilities	$	46,893	$	54,399

Components of Deferred Revenue

Deferred revenue



(dollars in thousands)	December 31, 2018		December 31, 2017
Recurring	$	286,960	$	265,513
One-time services and other	11,595		13,193
Total deferred revenue	298,555		278,706
Less: Long-term portion	2,564		3,643
Deferred revenue, current portion	$	295,991	$	275,063

Our opening and closing balances of contract assets and deferred revenue were as follows:



(in thousands)	December 31, 2018		December 31, 2017
Contract assets⁽¹⁾	$	308	$	—
Total deferred revenue	298,555		278,706

(1)

Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable. See Note 8 to these consolidated financial statements for additional details.

Components of Other Income and Expense



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Interest income	$	2,008		$	993		$	581
Gain on derivative instrument	—			462			—
Loss on debt extinguishment	—			(299		)	—
Other (expense) income, net	(905		)	1,104			(872		)
Other income (expense), net	$	1,103		$	2,260		$	(291	)

Debt (Tables)

12 Months Ended

Dec. 31, 2018

Annual Maturities Related to Credit Facility and Other Debt

Summary of Debt

The following table summarizes our debt balances and the related weighted average effective interest rates, which includes the effect of interest rate swap agreements.



	Debt balance at				Weighted average effective interest rate at
(dollars in thousands)	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
Credit facility:
Revolving credit loans	$	100,000	$	143,000	4.13	%	2.84	%
Term loans	288,750		296,250		3.44	%	2.64	%
Other debt	—		1,076		—	%	4.50	%
Total debt	388,750		440,326		3.61	%	2.71	%
Less: Unamortized discount and debt issuance costs	1,626		2,102
Less: Debt, current portion	7,500		8,576		3.77	%	3.03	%
Debt, net of current portion	$	379,624	$	429,648	3.61	%	2.71	%

As of December 31, 2018, the required annual maturities related to the 2017 Credit Facility were as follows:



Years ending December 31, (dollars in thousands)	Annual maturities
2019	$	7,500
2020	7,500
2021	7,500
2022	366,250
2023	—
Thereafter	—
Total required maturities	$	388,750

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Values of Derivative Instruments

The fair values of our derivative instruments were as follows as of:



		Asset Derivatives					Liability Derivatives
(dollars in thousands)	Balance sheet location	December 31, 2018		December 31, 2017		Balance sheet location	December 31, 2018		December 31, 2017
Derivative instruments designated as hedging instruments:
Interest rate swaps, current portion	Prepaid expenses and other current assets	$	—	$	145	Accrued expenses and other current liabilities	$	—	$	—
Interest rate swaps, long-term portion	Other assets	2,260		1,138		Other liabilities	186		—
Total derivative instruments designated as hedging instruments		$	2,260	$	1,283		$	186	$	—

Effects of Derivative Instruments in Cash Flow Hedging Relationships

The effects of derivative instruments in cash flow hedging relationships were as follows:



	Gain (loss) recognized in accumulated other comprehensive loss as of		Location of gain (loss) reclassified from accumulated other comprehensive loss into income	Gain (loss) reclassified from accumulated other comprehensive loss into income
(dollars in thousands)	December 31, 2018			Year ended December 31, 2018
Interest rate swaps	$	2,074	Interest expense	$	118

	December 31, 2017			Year ended December 31, 2017
Interest rate swaps	$	1,283	Interest expense	$	(293	)

	December 31, 2016			Year ended December 31, 2016
Interest rate swaps	$	42	Interest expense	$	(1,106	)

Effects of Undesignated Derivative Instruments

The effects of undesignated derivative instruments during 2017 were as follows:



	Location of gain (loss) recognized in income on derivative	Gain (loss) recognized in income
(dollars in thousands)	Location of gain (loss) recognized in income on derivative	Year ended December 31, 2017
Foreign currency option contracts	Other income (expense), net	$	513
Foreign currency forward contracts	Other income (expense), net	$	(51	)
Total gain⁽¹⁾		$	462

(1)

The individual amounts may not sum to total gain due to rounding.

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Commitments Related to Lease Agreements, Net of Related Lease Incentives



Years ending December 31, (dollars in thousands)	Operating leases⁽¹⁾
2019	$	20,808
2020	20,274
2021	16,924
2022	14,391
2023	12,923
Thereafter	81,755
Total minimum lease payments	$	167,075

(1)

Our future minimum lease commitments related to operating leases do not include payments related to Phase Two of our New Headquarters Facility, as that option had not been exercised as of December 31, 2018.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Components of Income Tax Expense

The following summarizes the components of income tax expense:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Current taxes:
U.S. Federal	$	(1,088	)	$	2,565		$	4,808
U.S. State and local	1,182			(144		)	1,670
International	306			101			53
Total current taxes	400			2,522			6,531
Deferred taxes:
U.S. Federal	659			(17,128		)	4,782
U.S. State and local	45			398			304
International	(1,323		)	(1,084		)	329
Total deferred taxes	(619		)	(17,814		)	5,415
Total income tax provision	$	(219	)	$	(15,292	)	$	11,946

Schedule of Income Before Provision for Income Taxes

The following summarizes the components of income before provision for income taxes:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
U.S.	$	47,532		$	58,547		$	55,381
International	(2,910		)	(206		)	1,969
Income before provision for income taxes	$	44,622		$	58,341		$	57,350

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation between the effect of applying the federal statutory rate and the effective income tax rate used to calculate our income tax provision is as follows:



	Years ended December 31,
	2018		2017		2016
Federal statutory rate	21.0	%	35.0	%	35.0	%
Effect of:
State income taxes, net of federal benefit	4.1		1.8		4.2
Change in federal income tax rate applied to deferred tax balances	—		(43.1	)	—
Change in state income tax rate applied to deferred tax balances	(0.4	)	—		0.2
Unrecognized tax benefit	(2.6	)	1.5		0.1
State credits, net of federal benefit	(1.9	)	(1.4	)	(0.1	)
Change in valuation reserve (primarily state credit reserves)	0.4		(1.0	)	(1.4	)
Federal credits generated	(10.4	)	(5.8	)	(5.5	)
Foreign tax rate	0.2		0.2		(0.4	)
Acquisition costs	—		2.2		0.1
Section 162(m) limitation	4.2		2.5		1.5
Domestic production activities deduction	—		—		(1.1	)
Stock-based compensation	(17.4	)	(18.9	)	(12.1	)
FDII benefit	(0.7	)	—		—
Nondeductible meals, entertainment, and transportation	2.6		0.8		0.9
Other	0.4		—		(0.6	)
Income tax provision effective rate	(0.5	)%	(26.2	)%	20.8	%

Schedule of Deferred Tax Assets and Liabilities

The significant components of our deferred tax assets and liabilities were as follows:



	December 31,
(dollars in thousands)	2018			2017
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$	11,021		$	13,597
Federal, state and foreign tax credits	18,936			14,389
Intangible assets	1,041			693
Stock-based compensation	11,462			9,611
Accrued bonuses	973			1,001
Deferred revenue	854			505
Allowance for doubtful accounts	1,242			1,379
Other	5,607			4,770
Total deferred tax assets	51,136			45,945
Deferred tax liabilities relating to:
Intangible assets	(43,700		)	(47,997		)
Fixed assets	(4,444		)	(4,552		)
Costs of obtaining contracts	(19,573		)	(18,756		)
Capitalized software development costs	(19,469		)	(14,012		)
Other	(926		)	(995		)
Total deferred tax liabilities	(88,112		)	(86,312		)
Valuation allowance	(6,855		)	(7,205		)
Net deferred tax liability	$	(43,831	)	$	(47,572	)

Summary of Changes in Deferred Tax Asset Valuation Allowance

The following table illustrates the change in our deferred tax asset valuation allowance:



Years ended December 31,	Balance at beginning of year		Acquisition- related change		Charges to expense			Balance at end of year
(dollars in thousands)
2018	$	7,205	$	16	$	(366	)	$	6,855
2017	6,994		—		211			7,205
2016	7,911		—		(917		)	6,994

Summary of Changes in Unrecognized Tax Benefits

The following table sets forth the change to our unrecognized tax benefit for the years ended December 31, 2018, 2017 and 2016:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Balance at December 31, 2017	$	5,160		$	3,145		$	3,024
Increases from prior period positions	104			1,860			23
Decreases in prior year positions	(413		)	(238		)	(17		)
Increases from current period positions	58			404			358
Lapse of statute of limitations	(1,205		)	(11		)	(243		)
Balance at December 31, 2018	$	3,704		$	5,160		$	3,145

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Awards Outstanding by Each Award Type

The following table sets forth the number of awards outstanding for each award type as of:



	Outstanding at December 31,
Award type	2018	2017
Restricted stock awards	1,263,510	1,257,574
Restricted stock units	459,673	493,248
Stock appreciation rights	60,871	212,506
Stock options	836	2,050

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense:



	Years ended December 31,
(in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	2,464	$	1,627	$	1,676
Cost of one-time services and other	2,778		1,843		1,621
Total included in cost of revenue	5,242		3,470		3,297
Included in operating expenses:
Sales, marketing and customer success	9,285		6,381		3,844
Research and development	9,048		7,765		6,467
General and administrative	24,699		23,015		19,030
Total included in operating expenses	43,032		37,161		29,341
Total stock-based compensation expense	$	48,274	$	40,631	$	32,638

Summary of Unvested Restricted Stock Awards, Activity

The following table summarizes our unvested restricted stock awards as of December 31, 2018, and changes during the year then ended:



Restricted stock awards	Restricted stock awards		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	1,257,574		$	61.00
Granted	541,786		94.51
Vested	(420,688	)	57.56
Forfeited	(115,162	)	72.93
Unvested at December 31, 2018	1,263,510		75.46		8.1	$	79,475

(1)

The intrinsic value is calculated as the market value as of the end of the fiscal period.

Summary of Unvested Restricted Stock Units, Activity

The following table summarizes our unvested restricted stock units as of December 31, 2018, and changes during the year then ended:



Restricted stock units	Restricted stock units		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	493,248		$	61.05
Granted	231,491		95.59
Forfeited	(24,507	)	79.85
Vested	(240,559	)	56.77
Unvested at December 31, 2018	459,673		79.78		8.4	$	28,913

(1)

The intrinsic value is calculated as the market value as of the end of the fiscal period.

Summary of Stock Appreciation Rights, Activity

The following table summarizes our outstanding SARs as of December 31, 2018, and changes during the year then ended:



Stock appreciation rights	Stock appreciation rights		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	212,506		$	23.01
Exercised	(151,635	)	23.31
Outstanding at December 31, 2018	60,871		22.24		0.8	$	2,475
Vested and exercisable at December 31, 2018	60,871		22.24		0.8	2,475

(1)

The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Summary of Stock Options, Activity

The following table summarizes our outstanding stock options as of December 31, 2018, and changes during the year then ended:



Stock options	Stock options		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	2,050		$	11.44
Exercised	(1,032	)	10.53
Expired	(182	)	10.59
Outstanding at December 31, 2018	836		12.75		0.7	$	42
Vested and exercisable at December 31, 2018	836		12.75		0.7	42

(1)

The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Changes in Accumulated Other Comprehensive Loss by Component

The changes in accumulated other comprehensive loss by component, consisted of the following:



	Years ended December 31,
(in thousands)	2018			2017			2016
Accumulated other comprehensive loss, beginning of period	$	(642	)	$	(604	)	$	(825	)
By component:
Gains and losses on cash flow hedges:
Accumulated other comprehensive income (loss) balance, beginning of period	$	748		$	(3	)	$	(19	)
Other comprehensive income (loss) before reclassifications, net of tax effects of $(239), $(374) and $406	670			574			(626		)
Amounts reclassified from accumulated other comprehensive loss to interest expense	(118		)	293			1,106
Tax benefit included in provision for income taxes	31			(116		)	(436		)
Total amounts reclassified from accumulated other comprehensive loss	(87		)	177			670
Net current-period other comprehensive income	583			751			44
Cumulative effect of adoption of ASU 2014-09	—			—			(28		)
Reclassification upon early adoption of ASU 2018-02	167			—			—
Accumulated other comprehensive income (loss) balance, end of period	$	1,498		$	748		$	(3	)
Foreign currency translation adjustment:
Accumulated other comprehensive loss balance, beginning of period	$	(1,390	)	$	(601	)	$	(806	)
Translation adjustments	(5,218		)	(789		)	205
Accumulated other comprehensive loss balance, end of period	(6,608		)	(1,390		)	(601		)
Accumulated other comprehensive loss, end of period	$	(5,110	)	$	(642	)	$	(604	)

Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Long-Lived Assets By Geographic Region

The following table presents long-lived assets by geographic region based on the location of the assets.



	Years ended December 31,
(dollars in thousands)	2018		2017
United States	$	37,015	$	39,071
Other countries	3,016		3,172
Total property and equipment	$	40,031	$	42,243

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Disaggregation of Revenue

Contract Balances

Deferred revenue



(dollars in thousands)	December 31, 2018		December 31, 2017
Recurring	$	286,960	$	265,513
One-time services and other	11,595		13,193
Total deferred revenue	298,555		278,706
Less: Long-term portion	2,564		3,643
Deferred revenue, current portion	$	295,991	$	275,063

Our opening and closing balances of contract assets and deferred revenue were as follows:



(in thousands)	December 31, 2018		December 31, 2017
Contract assets⁽¹⁾	$	308	$	—
Total deferred revenue	298,555		278,706

(1)

The following table presents our revenue by geographic area based on the address of our customers:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
United States	$	727,366	$	706,904	$	661,143
Other countries	121,240		81,583		70,499
Total revenue	$	848,606	$	788,487	$	731,642

The following table presents our revenue by market group:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
GMG	$	387,630	$	373,108	$	340,644
EMG	375,861		367,203		346,781
IMG	81,160		45,682		42,291
Other	3,955		2,494		1,926
Total revenue	$	848,606	$	788,487	$	731,642

Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



(dollars in thousands, except per share data)	December 31, 2018		September 30, 2018		June 30, 2018		March 31, 2018
Total revenue	$	221,218	$	209,532	$	213,672	$	204,184
Gross profit	117,922		114,295		118,500		116,147
Income from operations	14,679		15,783		11,374		17,581
Income before provision for income taxes	11,485		11,496		7,417		14,224
Net income	9,334		11,164		6,592		17,751
Earnings per share
Basic	$	0.20	$	0.24	$	0.14	$	0.38
Diluted	0.19		0.23		0.14		0.37

(dollars in thousands, except per share data)	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
Total revenue	$	217,402	$	194,424	$	191,589	$	185,072
Gross profit	114,980		107,419		104,594		99,590
Income from operations	19,959		18,423		16,523		13,273
Income before provision for income taxes	17,226		15,799		14,134		11,182
Net income	36,638		12,824		11,029		13,142
Earnings per share
Basic	$	0.78	$	0.27	$	0.24	$	0.28
Diluted	0.76		0.27		0.23		0.28

Note: The individual amounts for each quarter may not sum to full year totals due to rounding.

Restructuring (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Costs

The following table summarizes our facilities optimization restructuring costs as of December 31, 2018:



	Costs incurred during the year ended		Cumulative costs incurred as of
(in thousands)	December 31, 2018
By component:
Contract termination costs	$	3,581	$	4,176
Other costs	1,009		1,208
Total	$	4,590	$	5,384

Schedule of Restructuring Reserve by Type of Cost

The change in our liability related to our facilities optimization restructuring during the twelve months ended December 31, 2018, consisted of the following:



	Accrued at		Increases for incurred costs		Costs paid			Accrued at
(in thousands)	December 31, 2017		Increases for incurred costs		Costs paid			December 31, 2018
By component:
Contract termination costs	$	691	$	3,581	$	(2,407	)	$	1,865
Other costs	—		1,009		(959		)	50
Total	$	691	$	4,590	$	(3,366	)	$	1,915

Organization (Details)	Dec. 31, 2018 Customers
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Approximate number of customers distributed across verticals	45,000

Basis of Presentation (Details) - USD ($) $ in Thousands	12 Months Ended
Basis of Presentation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2016
Basis of Presentation [Line Items]
Expected period of benefit	5 years
Net foreign currency loss (gain)	$ 900	$ (1,100)	$ 900
Advertising costs	$ 4,000	2,400	2,300
Contract term of recurring revenue contracts at contract inception (years)	3 years
Impairment of goodwill	$ 0	0	0
Impairment of intangible assets (excluding goodwill)	0	0	0
Capitalized software development costs	0	0
Impairment of capitalized software dev costs	0	0
Impairment of long-lived assets	$ 0	$ 0	0
Minimum [Member]
Basis of Presentation [Line Items]
Contract term of recurring revenue contracts at renewal (years)	1 year
Maximum [Member]
Basis of Presentation [Line Items]
Contract term of recurring revenue contracts at renewal (years)	3 years
ASU 2016-09 [Member]
Basis of Presentation [Line Items]
Cumulative effect of a change in accounting principle				$ 606
Discrete tax benefit, stock-based compensation			$ 7,700
ASU 2016-02 [Member] \| Minimum [Member]
Basis of Presentation [Line Items]
Aggregate lease liabilities expected to recognize	$ 105,000
ASU 2016-02 [Member] \| Maximum [Member]
Basis of Presentation [Line Items]
Aggregate lease liabilities expected to recognize	$ 135,000
Software Development [Member] \| Minimum [Member]
Basis of Presentation [Line Items]
Software development costs, estimated useful life (years)	3 years
Software Development [Member] \| Maximum [Member]
Basis of Presentation [Line Items]
Software development costs, estimated useful life (years)	7 years
Retained earnings [Member] \| ASU 2016-09 [Member]
Basis of Presentation [Line Items]
Cumulative effect of a change in accounting principle				$ (934)

Basis of Presentation Basis of Presentation (Adoption of New Standard Impact on Previously Reported Quarterly Results) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

$ 86,595

$ 95,679

$ 86,595

$ 95,679

$ 88,261

59,788

61,978

59,788

61,978

54,211

65,363

57,238

65,363

57,238

52,097

275,063

243,849

44,291

48,023

44,291

48,023

43,475

246,477

225,029

246,477

225,029

174,409

Revenue

848,606

788,487

731,642

381,742

361,904

339,220

192,848

169,559

150,157

$ 9,334

$ 11,164

$ 6,592

$ 17,751

$ 36,638

$ 12,824

$ 11,029

$ 13,142

$ 44,841

$ 73,633

$ 45,404

$ 0.20

$ 0.24

$ 0.14

$ 0.38

$ 0.78

$ 0.27

$ 0.24

$ 0.28

$ 0.95

$ 1.58

$ 0.98

$ 0.19

$ 0.23

$ 0.14

$ 0.37

$ 0.76

$ 0.27

$ 0.23

$ 0.28

$ 0.93

$ 1.54

$ 0.96

As Reported [Member]

$ 96,293

$ 88,932

56,099

48,314

24,083

22,524

276,456

244,500

37,597

29,558

195,649

152,729

Revenue

^[1]

788,306

730,815

^[1]

361,904

339,220

173,525

155,754

$ 65,933

$ 41,515

$ 1.41

$ 0.90

ASU 2014-09 [Member] | Adjustments [Member]

$ 1.38

$ 0.88

(614)

$ (614)

$ (671)

5,879

5,897

33,155

29,573

(1,393)

(651)

10,426

13,917

$ 29,380

29,380

21,680

Revenue

181

827

(3,966)

(5,597)

$ 7,700

$ 3,889

$ 0.17

$ 0.08

$ 0.16

$ 0.08

Recurring [Member]

Revenue

$ 762,181

$ 684,583

$ 609,063

Recurring [Member] | As Reported [Member]

305,481

277,639

246,669

Revenue

^[1]

651,031

575,933

Recurring [Member] | ASU 2014-09 [Member] | Adjustments [Member]

^[1]

265,713

235,977

Revenue

33,552

33,130

One-time services and other [Member]

11,926

10,692

Revenue

86,425

103,904

122,579

One-time services and other [Member] | As Reported [Member]

$ 76,261

84,265

92,551

Revenue

^[1]

137,275

154,882

One-time services and other [Member] | ASU 2014-09 [Member] | Adjustments [Member]

^[1]

96,191

103,243

Revenue

(33,371)

(32,303)

Customer relationships [Member]

$ (11,926)

$ (10,692)

[1]	(1) See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Basis of Presentation (Finite-Lived Intangible Assets by Major Class) (Details)

12 Months Ended

Dec. 31, 2018

Finite-lived intangible assets, amortization method

Straight-line and accelerated

^[1]

Customer relationships [Member] | Minimum [Member]

Customer relationships [Member] | Maximum [Member]

4 years

Marketing assets [Member]

17 years

Finite-lived intangible assets, amortization method

Straight-line

Marketing assets [Member] | Minimum [Member]

Marketing assets [Member] | Maximum [Member]

1 year

Acquired software and technology [Member]

15 years

Finite-lived intangible assets, amortization method

Straight-line and accelerated

Acquired software and technology [Member] | Minimum [Member]

Acquired software and technology [Member] | Maximum [Member]

1 year

Non-compete agreements [Member]

11 years

Finite-lived intangible assets, amortization method

Straight-line

Non-compete agreements [Member] | Minimum [Member]

Non-compete agreements [Member] | Maximum [Member]

1 year

5 years

Database [Member]

Finite-lived intangible assets, amortization method

Straight-line

8 years

[1]	Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Basis of Presentation (Changes in Allowance for Sales Returns and Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for sales returns [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4,400	$ 2,704	$ 4,431
Provision/adjustment	4,952	10,511	3,060
Write-off	(5,975)	(8,815)	(4,787)
Balance at end of year	3,377	4,400	2,704
Allowance for doubtful accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	741	587	512
Provision/adjustment	2,446	1,148	499
Write-off	(1,842)	(994)	(424)
Balance at end of year	$ 1,345	$ 741	$ 587

Business Combinations (Details) £ in Millions, $ in Millions	Apr. 30, 2018 USD ($)	Oct. 02, 2017 USD ($)	Oct. 02, 2017 GBP (£)	Jun. 02, 2017 USD ($)	Apr. 03, 2017 USD ($)
Reeher [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition	$ 41.2
Estimated fair value of accounts receivable acquired	1.1
Goodwill, tax deductible amount	$ 11.7
JustGiving [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition		$ 137.2	£ 102.4
Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit				$ 110.0
Revolving Credit Facility [Member] \| JustGiving [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit		$ 138.7
Revolving Credit Facility [Member] \| AcademicWorks [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition					$ 52.1

Business Combinations (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 545,213		$ 530,249
Reeher [Member]
Business Acquisition [Line Items]
Net working capital, excluding deferred revenue		$ 1,683
Property and equipment		755
Finite-lived intangible assets		27,055
Deferred tax asset		713
Deferred revenue		(2,700)
Goodwill		13,681
Total purchase price		$ 41,187

Business Combinations (Acquired Intangible Assets) (Details) - Reeher [Member] $ in Thousands	Apr. 30, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 27,055
Weighted average amortization period (in years)	11 years
Acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 19,500
Weighted average amortization period (in years)	11 years
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 7,000
Weighted average amortization period (in years)	10 years
Marketing assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 480
Weighted average amortization period (in years)	3 years
Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 75
Weighted average amortization period (in years)	2 years

Goodwill and Other Intangible Assets (Change in Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2017	$ 530,249
Additions related to current year business combinations	18,271
Adjustments related to prior year business combinations	(333)
Effect of foreign currency translation	(2,974)
Balance at December 31, 2018	$ 545,213

Goodwill And Other Intangible Assets (Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 547,221	$ 524,007
Finite-lived intangible assets, accumulated amortization	(257,204)	(210,956)
Intangible assets, net (excluding goodwill)	291,617	314,651
Marketing assets [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill), gross carrying amount	1,600	1,600
Customer relationships [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	280,309	274,458
Finite-lived intangible assets, accumulated amortization	(116,648)	(96,662)
Marketing assets [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	48,484	49,661
Finite-lived intangible assets, accumulated amortization	(16,395)	(12,444)
Acquired software and technology [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	211,654	193,010
Finite-lived intangible assets, accumulated amortization	(118,268)	(96,528)
Non-compete agreements [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	2,499	2,603
Finite-lived intangible assets, accumulated amortization	(1,618)	(1,125)
Database [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	4,275	4,275
Finite-lived intangible assets, accumulated amortization	$ (4,275)	$ (4,197)

Goodwill and Other Intangible Assets (Summary of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	$ 47,077	$ 43,370	$ 42,398
Cost of recurring [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	39,877	37,557	36,597
Cost of one-time services and other [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	2,356	2,542	2,961
Total included in cost of revenue [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	42,233	40,099	39,558
Included in operating expenses [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	$ 4,844	$ 3,271	$ 2,840

Goodwill and Other Intangible Assets (Future Amortization Expense for Finite-Lived Intangible Assets) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Future amortization expense for finite-lived intangible assets:
2019	$ 45,266
2020	36,995
2021	31,453
2022	27,969
2023	26,213
Total	$ 167,896

Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 9,334	$ 11,164	$ 6,592	$ 17,751	$ 36,638	$ 12,824	$ 11,029	$ 13,142	$ 44,841	$ 73,633	$ 45,404
Weighted average common shares									47,206,669	46,669,440	46,132,389
Stock-based awards									838,415	1,106,262	1,184,149
Weighted average common shares assuming dilution									48,045,084	47,775,702	47,316,538
Earnings (Loss) Per Share, Basic and Diluted [Abstract]
Basic earnings per share	$ 0.20	$ 0.24	$ 0.14	$ 0.38	$ 0.78	$ 0.27	$ 0.24	$ 0.28	$ 0.95	$ 1.58	$ 0.98
Diluted earnings per share	$ 0.19	$ 0.23	$ 0.14	$ 0.37	$ 0.76	$ 0.27	$ 0.23	$ 0.28	$ 0.93	$ 1.54	$ 0.96
Shares excluded from calculations of diluted earnings per share									48,881	4,634	7,339

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair value measurements, recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 2,260	$ 1,283
Total financial assets	2,260	1,283
Derivative liabilities	186
Total financial liabilities	186
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Total financial assets	0	0
Derivative liabilities	0
Total financial liabilities	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,260	1,283
Total financial assets	2,260	1,283
Derivative liabilities	186
Total financial liabilities	186
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Total financial assets	0	$ 0
Derivative liabilities	0
Total financial liabilities	$ 0

Property and Equipment and Software Development Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 15.9	$ 17.8	$ 19.8
Software development costs, amortization	$ 16.6	$ 12.8	$ 8.3

Property and Equipment and Software Development Costs (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 147,629	$ 145,843
Less: accumulated depreciation	(107,598)	(103,600)
Property and equipment, net	40,031	42,243
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,243	2,728
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	2 years
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	5 years
Computer hardware [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 75,060	76,331
Computer hardware [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	2 years
Computer hardware [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	5 years
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 34,294	34,058
Computer software [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	2 years
Computer software [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	5 years
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 233	3,102
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,004	7,265
Furniture and fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	3 years
Furniture and fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	10 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 26,795	$ 22,359

Property and Equipment and Software Development Costs (Schedule of Software Development Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Software development costs, gross	$ 121,983	$ 84,404
Less: accumulated amortization	(46,884)	(30,306)
Software development costs, net	$ 75,099	$ 54,098
Software Development [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Software development costs, estimated useful life (years)	3 years
Software Development [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Software development costs, estimated useful life (years)	7 years

Consolidated Financial Statement Details (Components of Prepaid Expenses and Other Assets) (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Costs of obtaining contracts

^[2]

$ 85,590

^[1]

$ 77,312

Prepaid software maintenance and subscriptions

21,134

17,402

Taxes, prepaid and receivable

2,055

10,548

Unbilled accounts receivable

2,260

1,283

^[3]

4,161

3,136

Security deposits

1,020

2,305

Total prepaid expenses and other assets

8,931

7,230

125,151

119,216

Less: Long-term portion

65,363

57,238

Amortization expense from costs of obtaining contracts

59,788

61,978

$ 54,211

35,700

Cost of obtaining contracts, current portion

$ 31,700

$ 28,000

[1]	Amortization expense from costs of obtaining contracts was $35.7 million for the year ended December 31, 2018.
[2]	The current portion of costs of obtaining contracts as of December 31, 2018 and 2017 was $31.7 million and $28.0 million, respectively.
[3]	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable.

Consolidated Financial Statement Details (Components of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued bonuses	$ 14,868	$ 16,743
Accrued commissions and salaries	9,934	6,943
Taxes payable	6,204	5,517
Deferred rent liabilities	4,332	4,548
Customer credit balances	4,076	4,652
Lease incentive obligations	3,514	4,635
Unrecognized tax benefit	2,719	1,972
Accrued vacation costs	2,352	2,458
Accrued health care costs	1,497	2,615
Other liabilities	6,785	9,948
Total accrued expenses and other liabilities	56,281	60,031
Less: Long-term portion	9,388	5,632
Accrued expenses and other current liabilities	$ 46,893	$ 54,399

Consolidated Financial Statement Details (Components of Deferred Revenue) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 298,555	$ 278,706
Less: Long-term portion	2,564	3,643
Deferred revenue, current portion	295,991	275,063
Recurring [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue	286,960	265,513
One-time services and other [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 11,595	$ 13,193

Consolidated Financial Statement Details (Components of Other Income and Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 2,008	$ 993	$ 581
Gain on derivative instrument	0	462	0
Loss on debt extinguishment	0	(299)	0
Other (expense) income, net	(905)	1,104	(872)
Other income (expense), net	$ 1,103	$ 2,260	$ (291)

Debt (Details) $ in Thousands			1 Months Ended		12 Months Ended
Debt (Details) $ in Thousands	Apr. 30, 2018 USD ($)	Jun. 02, 2017 USD ($)	Sep. 29, 2017 USD ($)	Feb. 28, 2014 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 700,000		$ 325,000
Debt instrument, term		5 years		5 years
Change in present value of future cash flows to financing investors				10.00%
Payment of financing costs		$ 3,100			$ 0	$ 3,085	$ 0
Capitalized financing costs to be amortized over term of facility		1,000
Total deferred financing costs included in other assets					900	1,200
Aggregate financing costs related to debt discount and debt issuance costs		1,800			$ (1,626)	$ (2,102)
Commitment fee on unused portion of revolving credit facility					0.20%
Line of credit facility, available increase capacity, amount		$ 200,000
Line of credit facility, current borrowing capacity					$ 296,200
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee on unused portion of revolving credit facility					0.15%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee on unused portion of revolving credit facility					0.25%
Net Leverage Ratio		3.00
Federal funds rate option [Member]
Line of Credit Facility [Line Items]
Credit facility, variable interest rate					0.50%
Eurocurrency base rate option [Member]
Line of Credit Facility [Line Items]
Credit facility, variable interest rate					1.00%
Base rate margin [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					0.00%
Base rate margin [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					0.75%
Eurocurrency rate margin [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					1.00%
Eurocurrency rate margin [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					1.75%
Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 400,000
Proceeds from lines of credit		110,000
Term loans [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		300,000
Proceeds from lines of credit		300,000
Standby letters of credit [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		50,000
Swingline loans [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		50,000
Multicurrency borrowings [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 100,000
Reeher [Member]
Line of Credit Facility [Line Items]
Total cash consideration paid for the acquisition	$ 41,200
Loans payable [Member]
Line of Credit Facility [Line Items]
Debt instrument, term			2 years
Other debt, face amount			$ 2,200

Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jun. 02, 2017
Line of Credit Facility [Line Items]
Debt, gross	$ 388,750	$ 440,326
Less: Unamortized discount and debt issuance costs	1,626	2,102	$ (1,800)
Less: Debt, current portion	7,500	8,576
Debt, net of current portion	$ 379,624	$ 429,648
Weighted average effective interest rate	3.61%	2.71%
Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 100,000	$ 143,000
Weighted average effective interest rate	4.13%	2.84%
Term loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 288,750	$ 296,250
Weighted average effective interest rate	3.44%	2.64%
Short-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	3.77%	3.03%
Long-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	3.61%	2.71%
Loans payable [Member]
Line of Credit Facility [Line Items]
Other debt	$ 0	$ 1,076
Weighted average effective interest rate	0.00%	4.50%

Debt (Annual Maturities Related to Credit Facility and Other Debt) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2019	$ 7,500
2020	7,500
2021	7,500
2022	366,250
2023	0
Thereafter	0
Total required maturities	$ 388,750

Derivative Instruments (Details)
$ in Thousands, £ in Millions

12 Months Ended

Dec. 31, 2018

USD ($)

Dec. 31, 2017

USD ($)

Dec. 31, 2016

USD ($)

Feb. 28, 2018

USD ($)

Sep. 27, 2017

GBP (£)

Jul. 31, 2017

USD ($)

Jun. 28, 2017

GBP (£)

Proceeds from settlement of derivative instruments

$ 0

$ 1,030

$ 0

Accumulated other comprehensive income expected to be reclassified into earnings within next 12 months

1,000

Ineffective portion of interest rate swap(s)

Undesignated derivative instruments

462

^[1]

$ 0

July 2017 Swap [Member]

February 2018 Swap [Member]

$ 150,000

June 2017 Foreign Currency Option [Member]

$ 50,000

October 2017 Foreign Currency Forward [Member]

£ 100.0

Not Designated as Hedging Instrument [Member]

£ 103.5

Derivative, fair value, net

$ 0

[1]	The individual amounts may not sum to total gain due to rounding.

Derivative Instruments (Fair Value of Derivative Instruments) (Details) - Designated as hedging instrument [Member] - Interest rate swap [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 2,260	$ 1,283
Derivative liabilities, fair value	186	0
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, current portion	0	145
Accrued expenses and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current portion	0	0
Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, long-term portion	2,260	1,138
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, long-term portion	$ 186	$ 0

Derivative Instruments (Effects of Derivative Instruments in Cash Flow Hedging Relationships) (Details) - Interest rate swap [Member] - Cash flow hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive loss	$ 2,074	$ 1,283	$ 42
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated other comprehensive loss into income	$ 118	$ (293)	$ (1,106)

Derivative Instruments (Effects of Undesignated Derivative Instruments) (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Foreign currency option contracts [Member]

$ 0

$ 462

^[1]

$ 0

Foreign currency forward contracts [Member]

513

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

$ (51)

[1]	The individual amounts may not sum to total gain due to rounding.

Commitments and Contingencies (Details) $ in Millions		1 Months Ended		12 Months Ended
Commitments and Contingencies (Details) $ in Millions	May 04, 2012 lease	May 31, 2016 USD ($) ft² lease	Oct. 31, 2008 lease	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Total minimum rentals to be received in the future under noncancelable subleases				$ 7.2
Total rent expense				22.2	$ 16.1	$ 11.7
Building [Member] \| Texas [Member]
Operating Leased Assets [Line Items]
Annual base rent of operating lease				2.4
Standby letter of credit for security deposit				1.0
Number of renewal options (leases) \| lease	2
Lease agreement renewal term	5 years
Building [Member] \| Texas [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent	4.00%
Building [Member] \| Texas [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent	2.00%
Leasehold improvements [Member]
Operating Leased Assets [Line Items]
Remaining aggregate reimbursable leasehold improvements				3.8
Customer Operations Center [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Reduction in rent expense						$ 2.9
Customer Operations Center [Member] \| Building [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Annual base rent of operating lease				4.3
Number of renewal options (leases) \| lease			2
Lease agreement renewal term			5 years
Customer Operations Center [Member] \| Building [Member] \| South Carolina [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent			5.50%
World Headquarters [Member] \| Building [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Rentable square feet (square foot) \| ft²		172,000
Annual base rent of operating lease		$ 4.4
Percentage of change in base rent		2.00%
Number of renewal options (leases) \| lease		4
Lease agreement renewal term		5 years
Third-party technology [Member]
Long-term Purchase Commitment [Line Items]
Remaining aggregate minimum purchase commitment				$ 109.9

Commitments and Contingencies (Future Minimum Lease Commitments Related to Lease Agreements, Net of Related Lease Incentives) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 20,808
2020	20,274
2021	16,924
2022	14,391
2023	12,923
Thereafter	81,755
Total minimum lease payments	$ 167,075

Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate	$ 3.3
Accrued interest and penalties	0.7	$ 0.8
Reasonably possible decrease in unrecognized tax benefits	1.4
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	24.3
Tax credit carryforwards	6.5
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	24.5
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards	25.1
Tax credit carryforwards	$ 14.1

Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. Federal	$ (1,088)	$ 2,565	$ 4,808
U.S. State and local	1,182	(144)	1,670
International	306	101	53
Total current taxes	400	2,522	6,531
U.S. Federal	659	(17,128)	4,782
U.S. State and local	45	398	304
International	(1,323)	(1,084)	329
Total deferred taxes	(619)	(17,814)	5,415
Total income tax provision	$ (219)	$ (15,292)	$ 11,946

Income Taxes (Schedule of Income Before Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S.									$ 47,532	$ 58,547	$ 55,381
International									(2,910)	(206)	1,969
Income before provision for income taxes	$ 11,485	$ 11,496	$ 7,417	$ 14,224	$ 17,226	$ 15,799	$ 14,134	$ 11,182	$ 44,622	$ 58,341	$ 57,350

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	35.00%	35.00%
Effect of:
State income taxes, net of federal benefit	4.10%	1.80%	4.20%
Unrecognized tax benefit	(2.60%)	1.50%	0.10%
State credits, net of federal benefit	(1.90%)	(1.40%)	(0.10%)
Change in valuation reserve (primarily state credit reserves)	0.40%	(1.00%)	(1.40%)
Federal credits generated	(10.40%)	(5.80%)	(5.50%)
Foreign tax rate	0.20%	0.20%	(0.40%)
Acquisition costs	0.00%	2.20%	0.10%
Section 162(m) limitation	4.20%	2.50%	1.50%
Domestic production activities deduction	0.00%	0.00%	(1.10%)
Stock-based compensation	(17.40%)	(18.90%)	(12.10%)
Effective Income Tax Rate Reconciliation, Deduction, TCJA FDII, Percent	(0.70%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	2.60%	0.80%	0.90%
Other	0.40%	0.00%	(0.60%)
Income tax provision effective rate	(0.50%)	(26.20%)	20.80%
Domestic Tax Authority [Member]
Effect of:
Change in income tax rate applied to deferred tax balances	0.00%	(43.10%)	0.00%
State and Local Jurisdiction [Member]
Effect of:
Change in income tax rate applied to deferred tax balances	(0.40%)	0.00%	0.20%

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$ 11,021	$ 13,597
Federal, state and foreign tax credits	18,936	14,389
Intangible assets	1,041	693
Stock-based compensation	11,462	9,611
Accrued bonuses	973	1,001
Deferred revenue	854	505
Allowance for doubtful accounts	1,242	1,379
Other	5,607	4,770
Total deferred tax assets	51,136	45,945
Deferred tax liabilities relating to:
Intangible assets	(43,700)	(47,997)
Fixed assets	(4,444)	(4,552)
Costs of obtaining contracts	(19,573)	(18,756)
Capitalized software development costs	(19,469)	(14,012)
Other	(926)	(995)
Total deferred tax liabilities	(88,112)	(86,312)
Valuation allowance	(6,855)	(7,205)	$ (6,994)	$ (7,911)
Net deferred tax liability	$ (43,831)	$ (47,572)

Income Taxes (Summary of Changes in Deferred Tax Asset Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 7,205	$ 6,994	$ 7,911
Acquisition-related change	16	0	0
Charges to expense	(366)	211	(917)
Balance at end of year	$ 6,855	$ 7,205	$ 6,994

Income Taxes (Summary of Changes in Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at December 31, 2017	$ 5,160	$ 3,145	$ 3,024
Increases from prior period positions	104	1,860	23
Decreases in prior year positions	(413)	(238)	(17)
Increases from current period positions	58	404	358
Lapse of statute of limitations	(1,205)	(11)	(243)
Balance at December 31, 2018	$ 3,704	$ 5,160	$ 3,145

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of authorized stock-based awards available (in shares)	4,347,224
Unvested awards, compensation cost not yet recognized	$ 74.1
Unvested awards, compensation cost not yet recognized, period of recognition (in years)	1 year 8 months 12 days
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years
Restricted stock vested, total fair value	$ 24.2	$ 19.4	$ 14.5
Restricted stock granted, weighted average grant date fair value	$ 94.51	$ 74.08	$ 53.59
Vesting period (in years)	4 years
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years
Restricted stock vested, total fair value	$ 13.7	$ 9.4	$ 6.7
Restricted stock granted, weighted average grant date fair value	$ 95.59	$ 72.19	$ 51.98
Vesting period (in years)	3 years
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	7 years
Options exercised, total intrinsic value	$ 12.4	$ 14.2	$ 10.7
Options vested, total fair value			$ 1.0
Vesting period (in years)	4 years
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years

Stock-Based Compensation (Summary of Awards Outstanding by Each Award Type) (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	1,263,510	1,257,574
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	459,673	493,248
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	60,871	212,506
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	836	2,050

Stock-Based Compensation (Summary of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 48,274	$ 40,631	$ 32,638
Cost of recurring [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	2,464	1,627	1,676
Cost of one-time services and other [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	2,778	1,843	1,621
Total included in cost of revenue [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	5,242	3,470	3,297
Sales, marketing and customer success [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	9,285	6,381	3,844
Research and development [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	9,048	7,765	6,467
General and administrative [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	24,699	23,015	19,030
Total included in operating expense [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 43,032	$ 37,161	$ 29,341

Stock-Based Compensation (Summary of Unvested Restricted Stock Awards, Activity) (Details) - Restricted stock awards [Member] - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Unvested, weighted average grant date fair value, beginning of period

1,257,574

$ 61.00

541,786

$ 94.51

$ 74.08

$ 53.59

(420,688)

$ 57.56

(115,162)

$ 72.93

Unvested, weighted average grant date fair value, end of period

1,263,510

1,257,574

$ 75.46

$ 61.00

Unvested, weighted average remaining contractual term

8 years 1 month 6 days

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

$ 79,475

[1]	The intrinsic value is calculated as the market value as of the end of the fiscal period.

Stock-Based Compensation (Summary of Unvested Restricted Stock Units, Activity) (Details) - Restricted stock units [Member] - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Unvested, weighted average grant date fair value, beginning of period

493,248

$ 61.05

231,491

$ 95.59

$ 72.19

$ 51.98

(24,507)

$ 79.85

(240,559)

$ 56.77

Unvested, weighted average grant date fair value, end of period

459,673

493,248

$ 79.78

$ 61.05

Unvested, weighted average remaining contractual term

8 years 4 months 24 days

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

$ 28,913

[1]	The intrinsic value is calculated as the market value as of the end of the fiscal period.

Stock-Based Compensation (Summary of Stock Appreciation Rights, Activity) (Details) - Stock appreciation rights (SARs) [Member]
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

USD ($)

$ / shares

Outstanding, weighted average exercise price, beginning of period | $ / shares

212,506

$ 23.01

Exercised, weighted average exercise price | $ / shares

(151,635)

$ 23.31

Outstanding, weighted average exercise price, end of period | $ / shares

60,871

$ 22.24

Outstanding, weighted average remaining contractual term

24 days

$ 2,475

^[1]

Vested and exercisable, weighted average exercise price | $ / shares

60,871

$ 22.24

Vested and exercisable, weighted average remaining contractual term

24 days

Vested and exercisable, aggregate intrinsic value | $

$ 2,475

^[1]

[1]	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares

Stock-Based Compensation (Summary of Stock Options, Activity) (Details) - Stock options [Member]
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

USD ($)

$ / shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Outstanding, weighted average exercise price, beginning of period | $ / shares

2,050

$ 11.44

Exercised, weighted average exercise price | $ / shares

(1,032)

$ 10.53

Expired, number | shares

(182)

Expired, weighted average exercise price | $ / shares

$ 10.59

Outstanding, weighted average exercise price, end of period | $ / shares

836

$ 12.75

Outstanding, weighted average remaining contractual term

21 days

$ 42

^[1]

Vested and exercisable, weighted average exercise price | $ / shares

836

$ 12.75

Vested and exercisable, weighted average remaining contractual term

21 days

Vested and exercisable, aggregate intrinsic value | $

$ 42

^[1]

[1]	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Dec. 14, 2018	Sep. 14, 2018	Jun. 15, 2018	Mar. 15, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 15, 2019	Aug. 31, 2010
Equity [Abstract]
Dividends paid per share (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.48	$ 0.48	$ 0.48
Stock repurchase program, authorized amount									$ 50.0
Stock repurchase program, remaining authorized repurchase amount					$ 50.0
Subsequent event [Member]
Dividends Payable [Line Items]
Dividends payable per share (in dollars per share)								$ 0.12

Stockholders' Equity (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017	Jan. 01, 2016
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	$ (642)	$ (604)	$ (825)
Reclassification upon early adoption of ASU 2018-02	0
Translation adjustments	(5,218)	(789)	205
Accumulated other comprehensive (loss) income, end of period	(5,110)	(642)	(604)
Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	748	(3)	(19)
Other comprehensive income (loss) before reclassifications	670	574	(626)
Amounts reclassified from accumulated other comprehensive loss to interest expense	(118)	293	1,106
Tax benefit included in provision for income taxes	31	(116)	(436)
Total amounts reclassified from accumulated other comprehensive loss	(87)	177	670
Net current-period other comprehensive income	583	751	44
Reclassification upon early adoption of ASU 2018-02	167	0	0
Accumulated other comprehensive (loss) income, end of period	1,498	748	(3)
Unrealized (losses) gains, tax effects	(239)	(374)	406
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	(1,390)	(601)	(806)
Translation adjustments	(5,218)	(789)	205
Accumulated other comprehensive (loss) income, end of period	$ (6,608)	$ (1,390)	$ (601)
ASU 2014-09 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect of adoption of ASU 2014-09						$ (17,763)
ASU 2014-09 [Member] \| Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect of adoption of ASU 2014-09				$ 0	$ 0	$ (28)

Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
Defined Contribution Plan (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of qualified employees' contribution	50.00%	50.00%	50.00%
Employer matching contributions, total	$ 8.1	$ 7.1	$ 7.6
Employer discretionary contributions, total	$ 0.0	$ 0.0	$ 0.0
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percent of salary	1.00%	1.00%	1.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percent of salary	75.00%	75.00%	75.00%
Employer matching contribution, percent of employees' salary	6.00%	6.00%	6.00%

Segment Information (Long-Lived Assets By Geographic Region) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 40,031	$ 42,243
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	37,015	39,071
Other countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 3,016	$ 3,172

Revenue Recognition Revenue Recognition (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 738
Revenue, remaining performance obligation, percentage to be recognized	60.00%
Revenue, remaining performance obligation, expected timing of satisfaction	12 months
Revenue recognized that was included in deferred revenue at beginning of period	$ 270

Revenue Recognition Revenue Recognition (Contract Balances) (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

Contract assets

^[1]

$ 308

$ 0

Total deferred revenue

$ 298,555

$ 278,706

[1]	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable. See Note 8 to these consolidated financial statements for additional details.

Revenue Recognition (Revenue by Geography) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 848,606	$ 788,487	$ 731,642
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	727,366	706,904	661,143
Other countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 121,240	$ 81,583	$ 70,499

Revenue Recognition (Revenue by Market Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 848,606	$ 788,487	$ 731,642
GMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	387,630	373,108	340,644
EMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	375,861	367,203	346,781
IMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	81,160	45,682	42,291
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 3,955	$ 2,494	$ 1,926

Quarterly Results (unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 221,218	$ 209,532	$ 213,672	$ 204,184	$ 217,402	$ 194,424	$ 191,589	$ 185,072
Gross profit	117,922	114,295	118,500	116,147	114,980	107,419	104,594	99,590	$ 466,864	$ 426,583	$ 392,422
Income from operations	14,679	15,783	11,374	17,581	19,959	18,423	16,523	13,273	59,417	68,178	68,224
Income before provision for income taxes	11,485	11,496	7,417	14,224	17,226	15,799	14,134	11,182	44,622	58,341	57,350
Net income	$ 9,334	$ 11,164	$ 6,592	$ 17,751	$ 36,638	$ 12,824	$ 11,029	$ 13,142	$ 44,841	$ 73,633	$ 45,404
Earnings per share, basic	$ 0.20	$ 0.24	$ 0.14	$ 0.38	$ 0.78	$ 0.27	$ 0.24	$ 0.28	$ 0.95	$ 1.58	$ 0.98
Earnings per share, diluted	$ 0.19	$ 0.23	$ 0.14	$ 0.37	$ 0.76	$ 0.27	$ 0.23	$ 0.28	$ 0.93	$ 1.54	$ 0.96

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Restructuring (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring costs, incurred to date	$ 5,384
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, expected	8,500
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, expected	$ 9,500

Restructuring (Schedule of Restructuring Costs) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Contract termination costs	$ 3,581
Other costs	1,009
Total	4,590
Cumulative costs incurred to date	5,384
Contract termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred to date	4,176
Other costs [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred to date	$ 1,208

Restructuring (Schedule of Restructuring Reserve by Type of Cost) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning of period	$ 691
Increases for incurred costs	4,590
Costs paid	(3,366)
Restructuring reserve, end of period	1,915
Contract termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning of period	691
Increases for incurred costs	3,581
Costs paid	(2,407)
Restructuring reserve, end of period	1,865
Other costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning of period	0
Increases for incurred costs	1,009
Costs paid	(959)
Restructuring reserve, end of period	$ 50

Subsequent Events Subsequent Events (Details) $ in Millions	Jan. 02, 2019 USD ($)
Revolving credit loans [Member] \| YourCause [Member] \| Subsequent event [Member]
Subsequent Event [Line Items]
Total cash consideration paid for the acquisition	$ 157.0

Label	Element	Value
Accounting Standards Update 2016-09 [Member] \| Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 1,540,000
Accounting Standards Update 2014-09 [Member] \| AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(28,000)
Accounting Standards Update 2014-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 17,791,000

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2018	Feb. 04, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document type	10-K
Amendment flag	false
Document period end date	Dec. 31, 2018
Document fiscal year focus	2018
Document fiscal period focus	Q4
Trading symbol	blkb
Entity registrant name	BLACKBAUD INC
Entity central index key	0001280058
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity small business	false
Entity emerging growth company	false
Entity shell company	false
Entity common stock, shares outstanding		48,568,295
Entity well-known seasoned issuer	Yes
Entity voluntary filers	No
Entity current reporting status	Yes
Entity public float			$ 4,380,929,403

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 30,866	$ 29,830
Restricted cash due to customers	418,980	610,344
Accounts receivable, net of allowance of $4,722 and $5,141 at December 31, 2018 and December 31, 2017, respectively	86,595	95,679
Customer funds receivable	1,753	1,536
Prepaid expenses and other current assets	59,788	61,978
Total current assets	597,982	799,367
Property and equipment, net	40,031	42,243
Software development costs, net	75,099	54,098
Goodwill	545,213	530,249
Intangible assets, net	291,617	314,651
Other assets	65,363	57,238
Total assets	1,615,305	1,797,846
Current liabilities:
Trade accounts payable	34,538	24,693
Accrued expenses and other current liabilities	46,893	54,399
Due to customers	420,733	611,880
Debt, current portion	7,500	8,576
Deferred revenue, current portion	295,991	275,063
Total current liabilities	805,655	974,611
Debt, net of current portion	379,624	429,648
Deferred tax liability	44,291	48,023
Deferred revenue, net of current portion	2,564	3,643
Other liabilities	9,388	5,632
Total liabilities	1,241,522	1,461,557
Commitments and contingencies (see Note 11)
Stockholders' equity:
Preferred stock; 20,000,000 shares authorized, none outstanding	0	0
Common stock, $0.001 par value; 180,000,000 shares authorized, 59,327,633 and 58,551,761 shares issued at December 31, 2018 and December 31, 2017, respectively	59	59
Additional paid-in capital	399,241	351,042
Treasury stock, at cost; 10,760,574 and 10,475,794 shares at December 31, 2018 and December 31, 2017, respectively	(266,884)	(239,199)
Accumulated other comprehensive loss	(5,110)	(642)
Retained earnings	246,477	225,029
Total stockholders' equity	373,783	336,289
Total liabilities and stockholders' equity	$ 1,615,305	$ 1,797,846

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 4,722	$ 5,141
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	59,327,633	58,551,761
Treasury stock, shares	10,760,574	10,475,794

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Revenue	$ 848,606	$ 788,487	$ 731,642
Cost of revenue
Cost of revenue	381,742	361,904	339,220
Gross profit	466,864	426,583	392,422
Operating expenses
Sales, marketing and customer success	192,848	169,559	150,157
Research and development	98,811	89,911	89,870
General and administrative	106,354	94,870	81,331
Amortization	4,844	3,271	2,840
Restructuring	4,590	794	0
Total operating expenses	407,447	358,405	324,198
Income from operations	59,417	68,178	68,224
Interest expense	(15,898)	(12,097)	(10,583)
Other income (expense), net	1,103	2,260	(291)
Income before provision for income taxes	44,622	58,341	57,350
Income tax (benefit) provision	(219)	(15,292)	11,946
Net income	$ 44,841	$ 73,633	$ 45,404
Earnings per share
Basic earnings per share	$ 0.95	$ 1.58	$ 0.98
Diluted earnings per share	$ 0.93	$ 1.54	$ 0.96
Common shares and equivalents outstanding
Basic weighted average shares	47,206,669	46,669,440	46,132,389
Diluted weighted average shares	48,045,084	47,775,702	47,316,538
Other comprehensive (loss) income
Foreign currency translation adjustment	$ (5,218)	$ (789)	$ 205
Unrealized gain on derivative instruments, net of tax	583	751	44
Total other comprehensive (loss) income	(4,635)	(38)	249
Comprehensive income	40,206	73,595	45,653
Recurring [Member]
Revenue
Revenue	762,181	684,583	609,063
Cost of revenue
Cost of revenue	305,481	277,639	246,669
One-time services and other [Member]
Revenue
Revenue	86,425	103,904	122,579
Cost of revenue
Cost of revenue	$ 76,261	$ 84,265	$ 92,551

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
Consolidated Statements of Cash Flows $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Cash flows from operating activities
Net income	$ 44,841	$ 73,633	$ 45,404
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	79,566	73,948	70,491
Provision for doubtful accounts and sales returns	6,890	11,686	3,730
Stock-based compensation expense	48,274	40,631	32,638
Deferred taxes	(619)	(17,814)	5,415
Amortization of deferred financing costs and discount	752	838	958
Other non-cash adjustments	(1,912)	504	(864)
Changes in operating assets and liabilities, net of acquisition and disposal of businesses:
Accounts receivable	2,166	(15,821)	(13,007)
Prepaid expenses and other assets	(5,217)	(9,550)	(8,495)
Trade accounts payable	9,487	1,024	3,689
Accrued expenses and other liabilities	(2,027)	(4,973)	(751)
Deferred revenue	19,184	22,184	14,420
Net cash provided by operating activities	201,385	176,290	153,628
Cash flows from investing activities
Purchase of property and equipment	(14,719)	(10,208)	(17,694)
Capitalized software development costs	(37,629)	(28,345)	(26,359)
Purchase of net assets of acquired companies, net of cash and restricted cash acquired	(44,943)	(146,789)	(3,377)
Purchase of derivative instruments	0	(568)	0
Proceeds from settlement of derivative instruments	0	1,030	0
Other investing activities	(500)	0	0
Net cash used in investing activities	(97,791)	(184,880)	(47,430)
Cash flows from financing activities
Proceeds from issuance of debt	270,900	774,500	227,200
Payments on debt	(322,476)	(679,119)	(293,575)
Debt issuance costs	0	(3,085)	0
Employee taxes paid for withheld shares upon equity award settlement	(27,685)	(23,962)	(15,376)
Proceeds from exercise of stock options	11	15	16
Change in due to customers	(188,502)	226,717	96,000
Change in customer funds receivable	(844)	6,644	0
Dividend payments to stockholders	(23,312)	(23,069)	(22,811)
Net cash (used in) provided by financing activities	(291,908)	278,641	(8,546)
Effect of exchange rate on cash, cash equivalents, and restricted cash	(2,014)	(550)	2,622
Net (decrease) increase in cash, cash equivalents, and restricted cash	(190,328)	269,501	100,274
Cash, cash equivalents, and restricted cash, beginning of year	640,174	370,673	270,399
Cash, cash equivalents, and restricted cash, end of year	449,846	640,174	370,673
Cash (paid) received during the year for:
Interest	(15,261)	(10,614)	(9,608)
Taxes, net of refunds	7,138	(5,613)	(1,340)
Non-cash investing and financing activities:
Purchase of equipment and other assets included in accounts payable	(882)	(1,546)	(3,155)
Acquired restricted cash liabilities due to customers	0	31,644	$ 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	30,866	29,830
Restricted cash due to customers	418,980	610,344
Total cash, cash equivalents and restricted cash in the statement of cash flows	$ 449,846	$ 640,174

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock [Member]	Additional paid-in capital [Member]	Treasury stock [Member]	Accumulated other comprehensive loss [Member]	Retained earnings [Member]
Balance (in shares) at Dec. 31, 2015		56,873,817
Balance at Dec. 31, 2015	$ 210,588	$ 57	$ 276,340	$ (199,861)	$ (825)	$ 134,877
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,404					45,404
Payment of dividends	(22,811)					(22,811)
Exercise of stock options and stock appreciation rights and vesting of restricted stock units (in shares)		341,418
Exercise of stock options and stock appreciation rights and vesting of restricted stock units	16		16
Employee taxes paid for withheld shares upon equity award settlement	(15,376)			(15,376)
Stock-based compensation	32,638		32,556			82
Restricted stock grants (in shares)		574,309
Restricted stock grants	1	$ 1
Restricted stock cancellations (in shares)		(117,143)
Other comprehensive income	249				249
Balance (in shares) at Dec. 31, 2016		57,672,401
Balance at Dec. 31, 2016	269,078	$ 58	310,452	(215,237)	(604)	174,409
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	73,633					73,633
Payment of dividends	(23,069)					(23,069)
Exercise of stock options and stock appreciation rights and vesting of restricted stock units (in shares)		390,291
Exercise of stock options and stock appreciation rights and vesting of restricted stock units	15		15
Employee taxes paid for withheld shares upon equity award settlement	(23,962)			(23,962)
Stock-based compensation	40,631		40,575			56
Restricted stock grants (in shares)		570,208
Restricted stock grants	1	$ 1
Restricted stock cancellations (in shares)		(81,139)
Other comprehensive income	(38)				(38)
Balance (in shares) at Dec. 31, 2017		58,551,761
Balance at Dec. 31, 2017	336,289	$ 59	351,042	(239,199)	(642)	225,029
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	44,841					44,841
Payment of dividends	(23,312)					(23,312)
Exercise of stock options and stock appreciation rights and vesting of restricted stock units (in shares)		349,248
Exercise of stock options and stock appreciation rights and vesting of restricted stock units	11		11
Employee taxes paid for withheld shares upon equity award settlement	(27,685)			(27,685)
Stock-based compensation	48,274		48,188			86
Restricted stock grants (in shares)		541,786
Restricted stock grants	0	$ 0
Restricted stock cancellations (in shares)		(115,162)
Other comprehensive income	(4,635)				(4,635)
StockholdersEquityASU201802Adoption	0				167	(167)
Balance (in shares) at Dec. 31, 2018		59,327,633
Balance at Dec. 31, 2018	$ 373,783	$ 59	$ 399,241	$ (266,884)	$ (5,110)	$ 246,477

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Employee taxes paid for withheld shares upon equity award settlement (in shares)	284,780	308,993	263,730
Dividends per share (in dollars per share)	$ 0.48	$ 0.48	$ 0.48

Organization

12 Months Ended

Dec. 31, 2018

Organization

1. Organization

Basis of Presentation

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Basis of Presentation

2. Basis of Presentation

Basis of presentation

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”).

Reclassifications

Basis of consolidation

The consolidated financial statements include the accounts of Blackbaud, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of estimates

Recently adopted accounting pronouncements

Select adjusted financial statement information, which reflects our adoption of ASU 2014-09 is set forth below.



Consolidated balance sheets:
	As of December 31, 2016							As of December 31, 2017
(dollars in thousands)	As Reported		Adjustments			As Adjusted		As Reported		Adjustments			As Adjusted
Accounts receivable, net of allowance	$	88,932	$	(671	)	$	88,261	$	96,293	$	(614	)	$	95,679
Prepaid expenses and other current assets	$	48,314	$	5,897		$	54,211	$	56,099	$	5,879		$	61,978
Other assets	$	22,524	$	29,573		$	52,097	$	24,083	$	33,155		$	57,238
Deferred revenue, current portion	$	244,500	$	(651	)	$	243,849	$	276,456	$	(1,393	)	$	275,063
Deferred tax liability	$	29,558	$	13,917		$	43,475	$	37,597	$	10,426		$	48,023
Retained earnings	$	152,729	$	21,680		$	174,409	$	195,649	$	29,380		$	225,029



Consolidated statements of comprehensive income:
	Year ended December 31, 2016							Year ended December 31, 2017
(dollars in thousands, except per share amounts)	As Reported⁽¹⁾		Adjustments			As Adjusted		As Reported⁽¹⁾		Adjustments			As Adjusted
Revenue
Recurring	$	575,933	$	33,130		$	609,063	$	651,031	$	33,552		$	684,583
One-time services and other	154,882		(32,303		)	122,579		137,275		(33,371		)	103,904
Total revenue	$	730,815	$	827		$	731,642	$	788,306	$	181		$	788,487
Cost of revenue
Recurring	$	235,977	$	10,692		$	246,669	$	265,713	$	11,926		$	277,639
One-time services and other	103,243		(10,692		)	92,551		96,191		(11,926		)	84,265
Total cost of revenue	$	339,220	$	—		$	339,220	$	361,904	$	—		$	361,904
Operating expenses
Sales, marketing and customer success	$	155,754	$	(5,597	)	$	150,157	$	173,525	$	(3,966	)	$	169,559
Net income	$	41,515	$	3,889		$	45,404	$	65,933	$	7,700		$	73,633
Basic earnings per share	$	0.90	$	0.08		$	0.98	$	1.41	$	0.17		$	1.58
Diluted earnings per share	$	0.88	$	0.08		$	0.96	$	1.38	$	0.16		$	1.54


(1)	See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Our adoption of ASU 2014-09 had no impact on our net cash provided by or used in operating, investing or financing activities for any of the periods reported.

Recently issued accounting pronouncements

Summary of significant accounting policies

Revenue recognition

We determine revenue recognition through the following steps:

•Identification of the contract, or contracts, with a customer;

•Identification of the performance obligations in the contract;

•Determination of the transaction price;

•Allocation of the transaction price to the performance obligations in the contract; and

•Recognition of revenue when, or as, we satisfy a performance obligation.

Recurring

One-time services and other

One-time services and other revenue primarily consists of fees for one-time consulting, analytic and onsite training services.

Contracts with multiple performance obligations

Costs of obtaining contracts, contract assets and deferred revenue

Fair value measurements


•	Level 1 - Quoted prices for identical assets or liabilities in active markets;


•	Level 2 - Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets in markets that are not active, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets; and


•	Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are unobservable.

Derivative instruments

Sales taxes

We present sales taxes and other taxes collected from customers and remitted to governmental authorities on a net basis and, as such, exclude them from revenues.

Cash and cash equivalents

We consider all highly liquid investments purchased with an original maturity of three months or less and cash items in transit to be cash equivalents.

Restricted cash due to customers; Customer funds receivable; Due to customers

Concentration of credit risk

Property and equipment

Business combinations

Goodwill

Intangible assets other than goodwill

We amortize finite-lived intangible assets over their estimated useful lives as follows.



	Basis of amortization	Amortization period (in years)
Customer relationships	Straight-line and accelerated⁽¹⁾	4-17
Marketing assets	Straight-line	1-15
Acquired software and technology	Straight-line and accelerated⁽¹⁾	1-11
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Deferred financing costs

Stock-based compensation

Income taxes

Foreign currency

Research and development

Software development costs

Sales returns and allowance for doubtful accounts

Below is a summary of the changes in our allowance for sales returns.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	4,400	$	4,952	$	(5,975	)	$	3,377
2017	2,704		10,511		(8,815		)	4,400
2016	4,431		3,060		(4,787		)	2,704

Below is a summary of the changes in our allowance for doubtful accounts.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	741	$	2,446	$	(1,842	)	$	1,345
2017	587		1,148		(994		)	741
2016	512		499		(424		)	587

Advertising costs

We expense advertising costs as incurred, which was $4.0 million, $2.4 million and $2.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Restructuring costs

Impairment of long-lived assets

Contingencies

Earnings per share

Business Combinations

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Business Combinations

3. Business Combinations

2018 Acquisitions

Reeher



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	1,683
Property and equipment	755
Identifiable intangible assets	27,055
Deferred tax asset	713
Deferred revenue	(2,700		)
Goodwill	13,681
Total purchase price	$	41,187

The Reeher acquisition resulted in the identification of the following identifiable intangible assets:



	Intangible assets acquired		Weighted average amortization period
Reeher	(in thousands)		(in years)
Acquired technology	$	19,500	11
Customer relationships	7,000		10
Marketing assets	480		3
Non-compete agreements	75		2
Total intangible assets	$	27,055	11

2017 Acquisitions

JustGiving

AcademicWorks

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Other Intangible Assets

4. Goodwill and Other Intangible Assets

The change in our goodwill during 2018 consisted of the following:



(dollars in thousands)	Total
Balance at December 31, 2017	$	530,249
Additions related to current year business combinations	18,271
Adjustments related to prior year business combinations	(333		)
Effect of foreign currency translation	(2,974		)
Balance at December 31, 2018	$	545,213



	December 31,
(dollars in thousands)	2018			2017
Finite-lived gross carrying amount
Customer relationships	$	280,309		$	274,458
Marketing assets	48,484			49,661
Acquired software and technology	211,654			193,010
Non-compete agreements	2,499			2,603
Database	4,275			4,275
Total finite-lived gross carrying amount	547,221			524,007
Accumulated amortization
Customer relationships	(116,648		)	(96,662		)
Marketing assets	(16,395		)	(12,444		)
Acquired software and technology	(118,268		)	(96,528		)
Non-compete agreements	(1,618		)	(1,125		)
Database	(4,275		)	(4,197		)
Total accumulated amortization	(257,204		)	(210,956		)
Indefinite-lived gross carrying amount
Marketing assets	1,600			1,600
Intangible assets, net	$	291,617		$	314,651

Amortization expense

The following table summarizes amortization expense of our finite-lived intangible assets:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	39,877	$	37,557	$	36,597
Cost of one-time services and other	2,356		2,542		2,961
Total included in cost of revenue	42,233		40,099		39,558
Included in operating expenses	4,844		3,271		2,840
Total amortization of intangibles from business combinations	$	47,077	$	43,370	$	42,398

The following table outlines the estimated future amortization expense for each of the next five years for our finite-lived intangible assets as of December 31, 2018:



Years ending December 31, (dollars in thousands)	Amortization expense
2019	$	45,266
2020	36,995
2021	31,453
2022	27,969
2023	26,213
Total	$	167,896

Earnings Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share

5. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:



	Years ended December 31,
(dollars in thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	44,841	$	73,633	$	45,404
Denominator:
Weighted average common shares	47,206,669		46,669,440		46,132,389
Add effect of dilutive securities:
Stock-based awards	838,415		1,106,262		1,184,149
Weighted average common shares assuming dilution	48,045,084		47,775,702		47,316,538
Earnings per share:
Basic	$	0.95	$	1.58	$	0.98
Diluted	$	0.93	$	1.54	$	0.96

Anti-dilutive shares excluded from calculations of diluted earnings per share	48,881		4,634		7,339

Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Fair Value Measurements

6. Fair Value Measurements

Recurring fair value measurements

Assets and liabilities that are measured at fair value on a recurring basis consisted of the following, as of the dates indicated below:



	Fair value measurement using
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Fair value as of December 31, 2018
Financial assets:
Derivative instruments	$	—	$	2,260	$	—	$	2,260
Total financial assets	$	—	$	2,260	$	—	$	2,260

Fair value as of December 31, 2018
Financial liabilities:
Derivative instruments	$	—	$	186	$	—	$	186
Total financial liabilities	$	—	$	186	$	—	$	186

Fair value as of December 31, 2017
Financial assets:
Derivative instruments	$	—	$	1,283	$	—	$	1,283
Total financial assets	$	—	$	1,283	$	—	$	1,283

Non-recurring fair value measurements

estimate fair value using market-based methods including the use of market capitalization and consideration of a control premium.

Property and Equipment and Software Development Costs

12 Months Ended

Dec. 31, 2018

Property and Equipment Disclosure

7. Property and Equipment and Software Development Costs

Property and equipment

Property and equipment consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Equipment	2 - 5	$	4,243		$	2,728
Computer hardware	2 - 5	75,060			76,331
Computer software	2 - 5	34,294			34,058
Construction in progress	—	233			3,102
Furniture and fixtures	3 - 10	7,004			7,265
Leasehold improvements	Lesser of lease term or 10 years	26,795			22,359
Total property and equipment		147,629			145,843
Less: accumulated depreciation		(107,598		)	(103,600		)
Property and equipment, net		$	40,031		$	42,243

Depreciation expense was $15.9 million, $17.8 million and $19.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Property and equipment, net of depreciation, under capital leases at December 31, 2018 and 2017 was insignificant.

Software development costs

Software development costs consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Software development costs	3 - 7	$	121,983		$	84,404
Less: accumulated amortization		(46,884		)	(30,306		)
Software development costs, net		$	75,099		$	54,098

Consolidated Financial Statement Details

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidated Financial Statement Details

8. Consolidated Financial Statement Details

Prepaid expenses and other assets



(dollars in thousands)	December 31, 2018		December 31, 2017
Costs of obtaining contracts⁽¹⁾⁽²⁾	$	85,590	$	77,312
Prepaid software maintenance and subscriptions	21,134		17,402
Taxes, prepaid and receivable	2,055		10,548
Derivative instruments	2,260		1,283
Unbilled accounts receivable⁽³⁾	4,161		3,136
Security deposits	1,020		2,305
Other assets	8,931		7,230
Total prepaid expenses and other assets	125,151		119,216
Less: Long-term portion	65,363		57,238
Prepaid expenses and other current assets	$	59,788	$	61,978


(1)	Amortization expense from costs of obtaining contracts was $35.7 million for the year ended December 31, 2018.


(2)	The current portion of costs of obtaining contracts as of December 31, 2018 and 2017 was $31.7 million and $28.0 million, respectively.


(3)	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable.

Accrued expenses and other liabilities



(dollars in thousands)	December 31, 2018		December 31, 2017
Accrued bonuses	$	14,868	$	16,743
Accrued commissions and salaries	9,934		6,943
Taxes payable	6,204		5,517
Deferred rent liabilities	4,332		4,548
Customer credit balances	4,076		4,652
Lease incentive obligations	3,514		4,635
Unrecognized tax benefit	2,719		1,972
Accrued vacation costs	2,352		2,458
Accrued health care costs	1,497		2,615
Other liabilities	6,785		9,948
Total accrued expenses and other liabilities	56,281		60,031
Less: Long-term portion	9,388		5,632
Accrued expenses and other current liabilities	$	46,893	$	54,399

Deferred revenue



(dollars in thousands)	December 31, 2018		December 31, 2017
Recurring	$	286,960	$	265,513
One-time services and other	11,595		13,193
Total deferred revenue	298,555		278,706
Less: Long-term portion	2,564		3,643
Deferred revenue, current portion	$	295,991	$	275,063

Other income (expense), net



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Interest income	$	2,008		$	993		$	581
Gain on derivative instrument	—			462			—
Loss on debt extinguishment	—			(299		)	—
Other (expense) income, net	(905		)	1,104			(872		)
Other income (expense), net	$	1,103		$	2,260		$	(291	)

Debt

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Debt

9. Debt

The following table summarizes our debt balances and the related weighted average effective interest rates, which includes the effect of interest rate swap agreements.



	Debt balance at				Weighted average effective interest rate at
(dollars in thousands)	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
Credit facility:
Revolving credit loans	$	100,000	$	143,000	4.13	%	2.84	%
Term loans	288,750		296,250		3.44	%	2.64	%
Other debt	—		1,076		—	%	4.50	%
Total debt	388,750		440,326		3.61	%	2.71	%
Less: Unamortized discount and debt issuance costs	1,626		2,102
Less: Debt, current portion	7,500		8,576		3.77	%	3.03	%
Debt, net of current portion	$	379,624	$	429,648	3.61	%	2.71	%

2017 refinancing

Summary of the 2017 Credit Facility

The 2017 Credit Facility is secured by the stock and limited liability company interests of certain of our subsidiaries and any of our material domestic subsidiaries.

Other debt

Financing for 2018 acquisition

On April 30, 2018, we acquired Reeher for $41.2 million in cash, net of closing adjustments. We financed the acquisition with a revolving credit loan under the 2017 Credit Facility.

As of December 31, 2018, the required annual maturities related to the 2017 Credit Facility were as follows:



Years ending December 31, (dollars in thousands)	Annual maturities
2019	$	7,500
2020	7,500
2021	7,500
2022	366,250
2023	—
Thereafter	—
Total required maturities	$	388,750

Derivative Instruments

12 Months Ended

Dec. 31, 2018

Derivatives Instruments

10. Derivative Instruments

Cash flow hedges

Undesignated contracts

The fair values of our derivative instruments were as follows as of:



		Asset Derivatives					Liability Derivatives
(dollars in thousands)	Balance sheet location	December 31, 2018		December 31, 2017		Balance sheet location	December 31, 2018		December 31, 2017
Derivative instruments designated as hedging instruments:
Interest rate swaps, current portion	Prepaid expenses and other current assets	$	—	$	145	Accrued expenses and other current liabilities	$	—	$	—
Interest rate swaps, long-term portion	Other assets	2,260		1,138		Other liabilities	186		—
Total derivative instruments designated as hedging instruments		$	2,260	$	1,283		$	186	$	—

We did not have any undesignated derivative instruments as of December 31, 2018 and 2017.

The effects of derivative instruments in cash flow hedging relationships were as follows:



	Gain (loss) recognized in accumulated other comprehensive loss as of		Location of gain (loss) reclassified from accumulated other comprehensive loss into income	Gain (loss) reclassified from accumulated other comprehensive loss into income
(dollars in thousands)	December 31, 2018			Year ended December 31, 2018
Interest rate swaps	$	2,074	Interest expense	$	118

	December 31, 2017			Year ended December 31, 2017
Interest rate swaps	$	1,283	Interest expense	$	(293	)

	December 31, 2016			Year ended December 31, 2016
Interest rate swaps	$	42	Interest expense	$	(1,106	)

We did not have any undesignated derivative instruments during 2018 and 2016. The effects of undesignated derivative instruments during 2017 were as follows:



	Location of gain (loss) recognized in income on derivative	Gain (loss) recognized in income
(dollars in thousands)	Location of gain (loss) recognized in income on derivative	Year ended December 31, 2017
Foreign currency option contracts	Other income (expense), net	$	513
Foreign currency forward contracts	Other income (expense), net	$	(51	)
Total gain⁽¹⁾		$	462

(1)

The individual amounts may not sum to total gain due to rounding.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

11. Commitments and Contingencies

Lease for New Headquarters Facility

Other leases

Total rent expense was $22.2 million, $16.1 million and $11.7 million for the years ended December 31, 2018, 2017 and 2016, respectively.



Years ending December 31, (dollars in thousands)	Operating leases⁽¹⁾
2019	$	20,808
2020	20,274
2021	16,924
2022	14,391
2023	12,923
Thereafter	81,755
Total minimum lease payments	$	167,075


(1)	Our future minimum lease commitments related to operating leases do not include payments related to Phase Two of our New Headquarters Facility, as that option had not been exercised as of December 31, 2018.

Other commitments

Solution and service indemnifications

Guarantees and indemnification obligations

Legal proceedings

Income Taxes

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Income Taxes

12. Income Taxes

The following summarizes the components of income tax expense:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Current taxes:
U.S. Federal	$	(1,088	)	$	2,565		$	4,808
U.S. State and local	1,182			(144		)	1,670
International	306			101			53
Total current taxes	400			2,522			6,531
Deferred taxes:
U.S. Federal	659			(17,128		)	4,782
U.S. State and local	45			398			304
International	(1,323		)	(1,084		)	329
Total deferred taxes	(619		)	(17,814		)	5,415
Total income tax provision	$	(219	)	$	(15,292	)	$	11,946

The following summarizes the components of income before provision for income taxes:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
U.S.	$	47,532		$	58,547		$	55,381
International	(2,910		)	(206		)	1,969
Income before provision for income taxes	$	44,622		$	58,341		$	57,350

A reconciliation between the effect of applying the federal statutory rate and the effective income tax rate used to calculate our income tax provision is as follows:



	Years ended December 31,
	2018		2017		2016
Federal statutory rate	21.0	%	35.0	%	35.0	%
Effect of:
State income taxes, net of federal benefit	4.1		1.8		4.2
Change in federal income tax rate applied to deferred tax balances	—		(43.1	)	—
Change in state income tax rate applied to deferred tax balances	(0.4	)	—		0.2
Unrecognized tax benefit	(2.6	)	1.5		0.1
State credits, net of federal benefit	(1.9	)	(1.4	)	(0.1	)
Change in valuation reserve (primarily state credit reserves)	0.4		(1.0	)	(1.4	)
Federal credits generated	(10.4	)	(5.8	)	(5.5	)
Foreign tax rate	0.2		0.2		(0.4	)
Acquisition costs	—		2.2		0.1
Section 162(m) limitation	4.2		2.5		1.5
Domestic production activities deduction	—		—		(1.1	)
Stock-based compensation	(17.4	)	(18.9	)	(12.1	)
FDII benefit	(0.7	)	—		—
Nondeductible meals, entertainment, and transportation	2.6		0.8		0.9
Other	0.4		—		(0.6	)
Income tax provision effective rate	(0.5	)%	(26.2	)%	20.8	%

The significant components of our deferred tax assets and liabilities were as follows:



	December 31,
(dollars in thousands)	2018			2017
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$	11,021		$	13,597
Federal, state and foreign tax credits	18,936			14,389
Intangible assets	1,041			693
Stock-based compensation	11,462			9,611
Accrued bonuses	973			1,001
Deferred revenue	854			505
Allowance for doubtful accounts	1,242			1,379
Other	5,607			4,770
Total deferred tax assets	51,136			45,945
Deferred tax liabilities relating to:
Intangible assets	(43,700		)	(47,997		)
Fixed assets	(4,444		)	(4,552		)
Costs of obtaining contracts	(19,573		)	(18,756		)
Capitalized software development costs	(19,469		)	(14,012		)
Other	(926		)	(995		)
Total deferred tax liabilities	(88,112		)	(86,312		)
Valuation allowance	(6,855		)	(7,205		)
Net deferred tax liability	$	(43,831	)	$	(47,572	)

The following table illustrates the change in our deferred tax asset valuation allowance:



Years ended December 31,	Balance at beginning of year		Acquisition- related change		Charges to expense			Balance at end of year
(dollars in thousands)
2018	$	7,205	$	16	$	(366	)	$	6,855
2017	6,994		—		211			7,205
2016	7,911		—		(917		)	6,994

The following table sets forth the change to our unrecognized tax benefit for the years ended December 31, 2018, 2017 and 2016:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Balance at December 31, 2017	$	5,160		$	3,145		$	3,024
Increases from prior period positions	104			1,860			23
Decreases in prior year positions	(413		)	(238		)	(17		)
Increases from current period positions	58			404			358
Lapse of statute of limitations	(1,205		)	(11		)	(243		)
Balance at December 31, 2018	$	3,704		$	5,160		$	3,145

Stock-Based Compensation

12 Months Ended

Dec. 31, 2018

Stock-Based Compensation

13. Stock-based Compensation

Employee stock-based compensation plans



	Outstanding at December 31,
Award type	2018	2017
Restricted stock awards	1,263,510	1,257,574
Restricted stock units	459,673	493,248
Stock appreciation rights	60,871	212,506
Stock options	836	2,050

Expense recognition



	Years ended December 31,
(in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	2,464	$	1,627	$	1,676
Cost of one-time services and other	2,778		1,843		1,621
Total included in cost of revenue	5,242		3,470		3,297
Included in operating expenses:
Sales, marketing and customer success	9,285		6,381		3,844
Research and development	9,048		7,765		6,467
General and administrative	24,699		23,015		19,030
Total included in operating expenses	43,032		37,161		29,341
Total stock-based compensation expense	$	48,274	$	40,631	$	32,638

Restricted stock awards

The following table summarizes our unvested restricted stock awards as of December 31, 2018, and changes during the year then ended:



Restricted stock awards	Restricted stock awards		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	1,257,574		$	61.00
Granted	541,786		94.51
Vested	(420,688	)	57.56
Forfeited	(115,162	)	72.93
Unvested at December 31, 2018	1,263,510		75.46		8.1	$	79,475


(1)	The intrinsic value is calculated as the market value as of the end of the fiscal period.

Restricted stock units

The following table summarizes our unvested restricted stock units as of December 31, 2018, and changes during the year then ended:



Restricted stock units	Restricted stock units		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	493,248		$	61.05
Granted	231,491		95.59
Forfeited	(24,507	)	79.85
Vested	(240,559	)	56.77
Unvested at December 31, 2018	459,673		79.78		8.4	$	28,913


(1)	The intrinsic value is calculated as the market value as of the end of the fiscal period.

Stock appreciation rights

The following table summarizes our outstanding SARs as of December 31, 2018, and changes during the year then ended:



Stock appreciation rights	Stock appreciation rights		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	212,506		$	23.01
Exercised	(151,635	)	23.31
Outstanding at December 31, 2018	60,871		22.24		0.8	$	2,475
Vested and exercisable at December 31, 2018	60,871		22.24		0.8	2,475


(1)	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Stock options

The following table summarizes our outstanding stock options as of December 31, 2018, and changes during the year then ended:



Stock options	Stock options		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	2,050		$	11.44
Exercised	(1,032	)	10.53
Expired	(182	)	10.59
Outstanding at December 31, 2018	836		12.75		0.7	$	42
Vested and exercisable at December 31, 2018	836		12.75		0.7	42


(1)	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Defined Contribution Plan

Stockholders' Equity

14. Stockholders' Equity

Preferred stock

Our Board of Directors may fix the relative rights and preferences of each series of preferred stock in a resolution of the Board of Directors.

Dividends

The following table provides information with respect to quarterly dividends paid on common stock during the year ended December 31, 2018.



Declaration Date	Dividend per Share		Record Date	Payable Date
February 6, 2018	$	0.12	February 28	March 15
April 30, 2018	0.12		May 25	June 15
July 30, 2018	0.12		August 28	September 14
October 29, 2018	0.12		November 28	December 14

On February 6, 2019, our Board of Directors declared a first quarter 2019 dividend of $0.12 per share payable on March 15, 2019 to stockholders of record on February 27, 2019.

Stock repurchase program

We account for purchases of treasury stock under the cost method. The remaining amount available to purchase stock under the stock repurchase program was $50.0 million as of December 31, 2018.

Changes in accumulated other comprehensive loss by component

The changes in accumulated other comprehensive loss by component, consisted of the following:



	Years ended December 31,
(in thousands)	2018			2017			2016
Accumulated other comprehensive loss, beginning of period	$	(642	)	$	(604	)	$	(825	)
By component:
Gains and losses on cash flow hedges:
Accumulated other comprehensive income (loss) balance, beginning of period	$	748		$	(3	)	$	(19	)
Other comprehensive income (loss) before reclassifications, net of tax effects of $(239), $(374) and $406	670			574			(626		)
Amounts reclassified from accumulated other comprehensive loss to interest expense	(118		)	293			1,106
Tax benefit included in provision for income taxes	31			(116		)	(436		)
Total amounts reclassified from accumulated other comprehensive loss	(87		)	177			670
Net current-period other comprehensive income	583			751			44
Cumulative effect of adoption of ASU 2014-09	—			—			(28		)
Reclassification upon early adoption of ASU 2018-02	167			—			—
Accumulated other comprehensive income (loss) balance, end of period	$	1,498		$	748		$	(3	)
Foreign currency translation adjustment:
Accumulated other comprehensive loss balance, beginning of period	$	(1,390	)	$	(601	)	$	(806	)
Translation adjustments	(5,218		)	(789		)	205
Accumulated other comprehensive loss balance, end of period	(6,608		)	(1,390		)	(601		)
Accumulated other comprehensive loss, end of period	$	(5,110	)	$	(642	)	$	(604	)

Defined Contribution Plan

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

15. Defined Contribution Plan

Segment Information

12 Months Ended

Dec. 31, 2018

Segment Information

16. Segment Information

The following table presents long-lived assets by geographic region based on the location of the assets.



	Years ended December 31,
(dollars in thousands)	2018		2017
United States	$	37,015	$	39,071
Other countries	3,016		3,172
Total property and equipment	$	40,031	$	42,243

See Note 17 to these consolidated financial statements for information about our revenues by geographic region.

Revenue Recognition

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer

17. Revenue Recognition

The prior period financial information presented below has been adjusted to reflect our adoption of ASU 2014-09.

Transaction price allocated to the remaining performance obligations

Contract balances

Our opening and closing balances of contract assets and deferred revenue were as follows:



(in thousands)	December 31, 2018		December 31, 2017
Contract assets⁽¹⁾	$	308	$	—
Total deferred revenue	298,555		278,706


(1)	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable. See Note 8 to these consolidated financial statements for additional details.

Disaggregation of revenue



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
United States	$	727,366	$	706,904	$	661,143
Other countries	121,240		81,583		70,499
Total revenue	$	848,606	$	788,487	$	731,642


•	The GMG focuses on sales to all K-12 private schools, faith communities and arts and cultural organizations, as well as emerging and mid-sized prospects in North America;


•	The EMG focuses on sales to all healthcare and higher education institutions, corporations and foundations, as well as large and/or strategic prospects in North America; and


•	The IMG focuses on sales to all prospects and customers outside of North America.

Beginning in the first quarter of 2019, all of our Canadian operations will be included in the IMG.

The following table presents our revenue by market group:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
GMG	$	387,630	$	373,108	$	340,644
EMG	375,861		367,203		346,781
IMG	81,160		45,682		42,291
Other	3,955		2,494		1,926
Total revenue	$	848,606	$	788,487	$	731,642

Quarterly Results (unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results

18. Quarterly Results (Unaudited)



(dollars in thousands, except per share data)	December 31, 2018		September 30, 2018		June 30, 2018		March 31, 2018
Total revenue	$	221,218	$	209,532	$	213,672	$	204,184
Gross profit	117,922		114,295		118,500		116,147
Income from operations	14,679		15,783		11,374		17,581
Income before provision for income taxes	11,485		11,496		7,417		14,224
Net income	9,334		11,164		6,592		17,751
Earnings per share
Basic	$	0.20	$	0.24	$	0.14	$	0.38
Diluted	0.19		0.23		0.14		0.37

(dollars in thousands, except per share data)	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
Total revenue	$	217,402	$	194,424	$	191,589	$	185,072
Gross profit	114,980		107,419		104,594		99,590
Income from operations	19,959		18,423		16,523		13,273
Income before provision for income taxes	17,226		15,799		14,134		11,182
Net income	36,638		12,824		11,029		13,142
Earnings per share
Basic	$	0.78	$	0.27	$	0.24	$	0.28
Diluted	0.76		0.27		0.23		0.28

Note: The individual amounts for each quarter may not sum to full year totals due to rounding.

Restructuring

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring

19. Restructuring

The following table summarizes our facilities optimization restructuring costs as of December 31, 2018:



	Costs incurred during the year ended		Cumulative costs incurred as of
(in thousands)	December 31, 2018
By component:
Contract termination costs	$	3,581	$	4,176
Other costs	1,009		1,208
Total	$	4,590	$	5,384

The change in our liability related to our facilities optimization restructuring during the twelve months ended December 31, 2018, consisted of the following:



	Accrued at		Increases for incurred costs		Costs paid			Accrued at
(in thousands)	December 31, 2017		Increases for incurred costs		Costs paid			December 31, 2018
By component:
Contract termination costs	$	691	$	3,581	$	(2,407	)	$	1,865
Other costs	—		1,009		(959		)	50
Total	$	691	$	4,590	$	(3,366	)	$	1,915

Subsequent Events

12 Months Ended

Dec. 31, 2018

Subsequent Events [Abstract]

Subsequent Events [Text Block]

20. Subsequent Events

YourCause acquisition

Basis of Presentation (Policy)

12 Months Ended

Dec. 31, 2018

Basis of presentation

Basis of presentationThe consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”).

Basis of consolidation

Use of estimates

Revenue recognition

We determine revenue recognition through the following steps:

•Identification of the contract, or contracts, with a customer;

•Identification of the performance obligations in the contract;

•Determination of the transaction price;

•Allocation of the transaction price to the performance obligations in the contract; and

•Recognition of revenue when, or as, we satisfy a performance obligation.

Recurring

One-time services and other

One-time services and other revenue primarily consists of fees for one-time consulting, analytic and onsite training services.

Contracts with multiple performance obligations

Costs of obtaining contracts, contract assets and deferred revenue

Fair value measurements


•	Level 1 - Quoted prices for identical assets or liabilities in active markets;


•	Level 2 - Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets in markets that are not active, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets; and


•	Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are unobservable.

Cash and cash equivalents

Sales taxes

Sales taxesWe present sales taxes and other taxes collected from customers and remitted to governmental authorities on a net basis and, as such, exclude them from revenues.

Cash and cash equivalentsWe consider all highly liquid investments purchased with an original maturity of three months or less and cash items in transit to be cash equivalents.

Restricted cash due to customers; due to customers

Concentration of credit risk

Property and equipment

Business combinations

Goodwill

Intangible assets

Intangible assets other than goodwill

We amortize finite-lived intangible assets over their estimated useful lives as follows.



	Basis of amortization	Amortization period (in years)
Customer relationships	Straight-line and accelerated⁽¹⁾	4-17
Marketing assets	Straight-line	1-15
Acquired software and technology	Straight-line and accelerated⁽¹⁾	1-11
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Deferred financing costs

Stock-based compensation

Income taxes

Foreign currency

Research and development

Software development costs, software for internal use

Software development costs

Software development costs, software to be sold

Sales returns and allowance for doubtful accounts

Accounts receivable

Advertising costs

Advertising costsWe expense advertising costs as incurred

Restructuring costs

Impairment of long-lived assets

Contingencies

Earnings per share

Recently adopted accounting pronouncements

Select adjusted financial statement information, which reflects our adoption of ASU 2014-09 is set forth below.



Consolidated balance sheets:
	As of December 31, 2016							As of December 31, 2017
(dollars in thousands)	As Reported		Adjustments			As Adjusted		As Reported		Adjustments			As Adjusted
Accounts receivable, net of allowance	$	88,932	$	(671	)	$	88,261	$	96,293	$	(614	)	$	95,679
Prepaid expenses and other current assets	$	48,314	$	5,897		$	54,211	$	56,099	$	5,879		$	61,978
Other assets	$	22,524	$	29,573		$	52,097	$	24,083	$	33,155		$	57,238
Deferred revenue, current portion	$	244,500	$	(651	)	$	243,849	$	276,456	$	(1,393	)	$	275,063
Deferred tax liability	$	29,558	$	13,917		$	43,475	$	37,597	$	10,426		$	48,023
Retained earnings	$	152,729	$	21,680		$	174,409	$	195,649	$	29,380		$	225,029



Consolidated statements of comprehensive income:
	Year ended December 31, 2016							Year ended December 31, 2017
(dollars in thousands, except per share amounts)	As Reported⁽¹⁾		Adjustments			As Adjusted		As Reported⁽¹⁾		Adjustments			As Adjusted
Revenue
Recurring	$	575,933	$	33,130		$	609,063	$	651,031	$	33,552		$	684,583
One-time services and other	154,882		(32,303		)	122,579		137,275		(33,371		)	103,904
Total revenue	$	730,815	$	827		$	731,642	$	788,306	$	181		$	788,487
Cost of revenue
Recurring	$	235,977	$	10,692		$	246,669	$	265,713	$	11,926		$	277,639
One-time services and other	103,243		(10,692		)	92,551		96,191		(11,926		)	84,265
Total cost of revenue	$	339,220	$	—		$	339,220	$	361,904	$	—		$	361,904
Operating expenses
Sales, marketing and customer success	$	155,754	$	(5,597	)	$	150,157	$	173,525	$	(3,966	)	$	169,559
Net income	$	41,515	$	3,889		$	45,404	$	65,933	$	7,700		$	73,633
Basic earnings per share	$	0.90	$	0.08		$	0.98	$	1.41	$	0.17		$	1.58
Diluted earnings per share	$	0.88	$	0.08		$	0.96	$	1.38	$	0.16		$	1.54


(1)	See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Our adoption of ASU 2014-09 had no impact on our net cash provided by or used in operating, investing or financing activities for any of the periods reported.

Recently issued accounting pronouncements

Legal contingencies

Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Finite-Lived Intangible Assets

We amortize finite-lived intangible assets over their estimated useful lives as follows.



	Basis of amortization	Amortization period (in years)
Customer relationships	Straight-line and accelerated⁽¹⁾	4-17
Marketing assets	Straight-line	1-15
Acquired software and technology	Straight-line and accelerated⁽¹⁾	1-11
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8

(1)

Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Schedule of Changes in Allowance for Sales Returns and Doubtful Accounts

Below is a summary of the changes in our allowance for sales returns.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	4,400	$	4,952	$	(5,975	)	$	3,377
2017	2,704		10,511		(8,815		)	4,400
2016	4,431		3,060		(4,787		)	2,704

Below is a summary of the changes in our allowance for doubtful accounts.



Years ended December 31, (in thousands)	Balance at beginning of year		Provision/ adjustment		Write-off			Balance at end of year
2018	$	741	$	2,446	$	(1,842	)	$	1,345
2017	587		1,148		(994		)	741
2016	512		499		(424		)	587

Adoption of New Standard Impact on Previously Reported Quarterly Results

Select adjusted financial statement information, which reflects our adoption of ASU 2014-09 is set forth below.



Consolidated balance sheets:
	As of December 31, 2016							As of December 31, 2017
(dollars in thousands)	As Reported		Adjustments			As Adjusted		As Reported		Adjustments			As Adjusted
Accounts receivable, net of allowance	$	88,932	$	(671	)	$	88,261	$	96,293	$	(614	)	$	95,679
Prepaid expenses and other current assets	$	48,314	$	5,897		$	54,211	$	56,099	$	5,879		$	61,978
Other assets	$	22,524	$	29,573		$	52,097	$	24,083	$	33,155		$	57,238
Deferred revenue, current portion	$	244,500	$	(651	)	$	243,849	$	276,456	$	(1,393	)	$	275,063
Deferred tax liability	$	29,558	$	13,917		$	43,475	$	37,597	$	10,426		$	48,023
Retained earnings	$	152,729	$	21,680		$	174,409	$	195,649	$	29,380		$	225,029



Consolidated statements of comprehensive income:
	Year ended December 31, 2016							Year ended December 31, 2017
(dollars in thousands, except per share amounts)	As Reported⁽¹⁾		Adjustments			As Adjusted		As Reported⁽¹⁾		Adjustments			As Adjusted
Revenue
Recurring	$	575,933	$	33,130		$	609,063	$	651,031	$	33,552		$	684,583
One-time services and other	154,882		(32,303		)	122,579		137,275		(33,371		)	103,904
Total revenue	$	730,815	$	827		$	731,642	$	788,306	$	181		$	788,487
Cost of revenue
Recurring	$	235,977	$	10,692		$	246,669	$	265,713	$	11,926		$	277,639
One-time services and other	103,243		(10,692		)	92,551		96,191		(11,926		)	84,265
Total cost of revenue	$	339,220	$	—		$	339,220	$	361,904	$	—		$	361,904
Operating expenses
Sales, marketing and customer success	$	155,754	$	(5,597	)	$	150,157	$	173,525	$	(3,966	)	$	169,559
Net income	$	41,515	$	3,889		$	45,404	$	65,933	$	7,700		$	73,633
Basic earnings per share	$	0.90	$	0.08		$	0.98	$	1.41	$	0.17		$	1.58
Diluted earnings per share	$	0.88	$	0.08		$	0.96	$	1.38	$	0.16		$	1.54

(1)

See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2018

Business Acquisition [Line Items]

Purchase Price Allocation



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	1,683
Property and equipment	755
Identifiable intangible assets	27,055
Deferred tax asset	713
Deferred revenue	(2,700		)
Goodwill	13,681
Total purchase price	$	41,187

Acquired Intangible Assets

The Reeher acquisition resulted in the identification of the following identifiable intangible assets:



	Intangible assets acquired		Weighted average amortization period
Reeher	(in thousands)		(in years)
Acquired technology	$	19,500	11
Customer relationships	7,000		10
Marketing assets	480		3
Non-compete agreements	75		2
Total intangible assets	$	27,055	11

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

The change in our goodwill during 2018 consisted of the following:



(dollars in thousands)	Total
Balance at December 31, 2017	$	530,249
Additions related to current year business combinations	18,271
Adjustments related to prior year business combinations	(333		)
Effect of foreign currency translation	(2,974		)
Balance at December 31, 2018	$	545,213

Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class

The table below sets forth the balances of each class of intangible asset and related amortization as of:



	December 31,
(dollars in thousands)	2018			2017
Finite-lived gross carrying amount
Customer relationships	$	280,309		$	274,458
Marketing assets	48,484			49,661
Acquired software and technology	211,654			193,010
Non-compete agreements	2,499			2,603
Database	4,275			4,275
Total finite-lived gross carrying amount	547,221			524,007
Accumulated amortization
Customer relationships	(116,648		)	(96,662		)
Marketing assets	(16,395		)	(12,444		)
Acquired software and technology	(118,268		)	(96,528		)
Non-compete agreements	(1,618		)	(1,125		)
Database	(4,275		)	(4,197		)
Total accumulated amortization	(257,204		)	(210,956		)
Indefinite-lived gross carrying amount
Marketing assets	1,600			1,600
Intangible assets, net	$	291,617		$	314,651

Summary of Amortization Expense

The following table summarizes amortization expense of our finite-lived intangible assets:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	39,877	$	37,557	$	36,597
Cost of one-time services and other	2,356		2,542		2,961
Total included in cost of revenue	42,233		40,099		39,558
Included in operating expenses	4,844		3,271		2,840
Total amortization of intangibles from business combinations	$	47,077	$	43,370	$	42,398

Future Amortization Expense for Finite-Lived Intangible Assets

The following table outlines the estimated future amortization expense for each of the next five years for our finite-lived intangible assets as of December 31, 2018:



Years ending December 31, (dollars in thousands)	Amortization expense
2019	$	45,266
2020	36,995
2021	31,453
2022	27,969
2023	26,213
Total	$	167,896

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:



	Years ended December 31,
(dollars in thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	44,841	$	73,633	$	45,404
Denominator:
Weighted average common shares	47,206,669		46,669,440		46,132,389
Add effect of dilutive securities:
Stock-based awards	838,415		1,106,262		1,184,149
Weighted average common shares assuming dilution	48,045,084		47,775,702		47,316,538
Earnings per share:
Basic	$	0.95	$	1.58	$	0.98
Diluted	$	0.93	$	1.54	$	0.96

Anti-dilutive shares excluded from calculations of diluted earnings per share	48,881		4,634		7,339

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities that are measured at fair value on a recurring basis consisted of the following, as of the dates indicated below:



	Fair value measurement using
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Fair value as of December 31, 2018
Financial assets:
Derivative instruments	$	—	$	2,260	$	—	$	2,260
Total financial assets	$	—	$	2,260	$	—	$	2,260

Fair value as of December 31, 2018
Financial liabilities:
Derivative instruments	$	—	$	186	$	—	$	186
Total financial liabilities	$	—	$	186	$	—	$	186

Fair value as of December 31, 2017
Financial assets:
Derivative instruments	$	—	$	1,283	$	—	$	1,283
Total financial assets	$	—	$	1,283	$	—	$	1,283

Property and Equipment and Software Development Costs (Tables)

12 Months Ended

Dec. 31, 2018

Property and equipment [Member]

Software development [Member]

Property and equipment consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Equipment	2 - 5	$	4,243		$	2,728
Computer hardware	2 - 5	75,060			76,331
Computer software	2 - 5	34,294			34,058
Construction in progress	—	233			3,102
Furniture and fixtures	3 - 10	7,004			7,265
Leasehold improvements	Lesser of lease term or 10 years	26,795			22,359
Total property and equipment		147,629			145,843
Less: accumulated depreciation		(107,598		)	(103,600		)
Property and equipment, net		$	40,031		$	42,243

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Software development costs consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2018			2017
Software development costs	3 - 7	$	121,983		$	84,404
Less: accumulated amortization		(46,884		)	(30,306		)
Software development costs, net		$	75,099		$	54,098

Consolidated Financial Statement Details (Tables)

12 Months Ended

Dec. 31, 2018

Components of Prepaid Expenses and Other Assets

Prepaid expenses and other assets



(dollars in thousands)	December 31, 2018		December 31, 2017
Costs of obtaining contracts⁽¹⁾⁽²⁾	$	85,590	$	77,312
Prepaid software maintenance and subscriptions	21,134		17,402
Taxes, prepaid and receivable	2,055		10,548
Derivative instruments	2,260		1,283
Unbilled accounts receivable⁽³⁾	4,161		3,136
Security deposits	1,020		2,305
Other assets	8,931		7,230
Total prepaid expenses and other assets	125,151		119,216
Less: Long-term portion	65,363		57,238
Prepaid expenses and other current assets	$	59,788	$	61,978


(1)	Amortization expense from costs of obtaining contracts was $35.7 million for the year ended December 31, 2018.


(2)	The current portion of costs of obtaining contracts as of December 31, 2018 and 2017 was $31.7 million and $28.0 million, respectively.

(3)

Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable.

Components of Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities



(dollars in thousands)	December 31, 2018		December 31, 2017
Accrued bonuses	$	14,868	$	16,743
Accrued commissions and salaries	9,934		6,943
Taxes payable	6,204		5,517
Deferred rent liabilities	4,332		4,548
Customer credit balances	4,076		4,652
Lease incentive obligations	3,514		4,635
Unrecognized tax benefit	2,719		1,972
Accrued vacation costs	2,352		2,458
Accrued health care costs	1,497		2,615
Other liabilities	6,785		9,948
Total accrued expenses and other liabilities	56,281		60,031
Less: Long-term portion	9,388		5,632
Accrued expenses and other current liabilities	$	46,893	$	54,399

Components of Deferred Revenue

Deferred revenue



(dollars in thousands)	December 31, 2018		December 31, 2017
Recurring	$	286,960	$	265,513
One-time services and other	11,595		13,193
Total deferred revenue	298,555		278,706
Less: Long-term portion	2,564		3,643
Deferred revenue, current portion	$	295,991	$	275,063

Our opening and closing balances of contract assets and deferred revenue were as follows:



(in thousands)	December 31, 2018		December 31, 2017
Contract assets⁽¹⁾	$	308	$	—
Total deferred revenue	298,555		278,706

(1)

Components of Other Income and Expense



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Interest income	$	2,008		$	993		$	581
Gain on derivative instrument	—			462			—
Loss on debt extinguishment	—			(299		)	—
Other (expense) income, net	(905		)	1,104			(872		)
Other income (expense), net	$	1,103		$	2,260		$	(291	)

Debt (Tables)

12 Months Ended

Dec. 31, 2018

Annual Maturities Related to Credit Facility and Other Debt

Summary of Debt

The following table summarizes our debt balances and the related weighted average effective interest rates, which includes the effect of interest rate swap agreements.



	Debt balance at				Weighted average effective interest rate at
(dollars in thousands)	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
Credit facility:
Revolving credit loans	$	100,000	$	143,000	4.13	%	2.84	%
Term loans	288,750		296,250		3.44	%	2.64	%
Other debt	—		1,076		—	%	4.50	%
Total debt	388,750		440,326		3.61	%	2.71	%
Less: Unamortized discount and debt issuance costs	1,626		2,102
Less: Debt, current portion	7,500		8,576		3.77	%	3.03	%
Debt, net of current portion	$	379,624	$	429,648	3.61	%	2.71	%

As of December 31, 2018, the required annual maturities related to the 2017 Credit Facility were as follows:



Years ending December 31, (dollars in thousands)	Annual maturities
2019	$	7,500
2020	7,500
2021	7,500
2022	366,250
2023	—
Thereafter	—
Total required maturities	$	388,750

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Values of Derivative Instruments

The fair values of our derivative instruments were as follows as of:



		Asset Derivatives					Liability Derivatives
(dollars in thousands)	Balance sheet location	December 31, 2018		December 31, 2017		Balance sheet location	December 31, 2018		December 31, 2017
Derivative instruments designated as hedging instruments:
Interest rate swaps, current portion	Prepaid expenses and other current assets	$	—	$	145	Accrued expenses and other current liabilities	$	—	$	—
Interest rate swaps, long-term portion	Other assets	2,260		1,138		Other liabilities	186		—
Total derivative instruments designated as hedging instruments		$	2,260	$	1,283		$	186	$	—

Effects of Derivative Instruments in Cash Flow Hedging Relationships

The effects of derivative instruments in cash flow hedging relationships were as follows:



	Gain (loss) recognized in accumulated other comprehensive loss as of		Location of gain (loss) reclassified from accumulated other comprehensive loss into income	Gain (loss) reclassified from accumulated other comprehensive loss into income
(dollars in thousands)	December 31, 2018			Year ended December 31, 2018
Interest rate swaps	$	2,074	Interest expense	$	118

	December 31, 2017			Year ended December 31, 2017
Interest rate swaps	$	1,283	Interest expense	$	(293	)

	December 31, 2016			Year ended December 31, 2016
Interest rate swaps	$	42	Interest expense	$	(1,106	)

Effects of Undesignated Derivative Instruments

The effects of undesignated derivative instruments during 2017 were as follows:



	Location of gain (loss) recognized in income on derivative	Gain (loss) recognized in income
(dollars in thousands)	Location of gain (loss) recognized in income on derivative	Year ended December 31, 2017
Foreign currency option contracts	Other income (expense), net	$	513
Foreign currency forward contracts	Other income (expense), net	$	(51	)
Total gain⁽¹⁾		$	462

(1)

The individual amounts may not sum to total gain due to rounding.

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Commitments Related to Lease Agreements, Net of Related Lease Incentives



Years ending December 31, (dollars in thousands)	Operating leases⁽¹⁾
2019	$	20,808
2020	20,274
2021	16,924
2022	14,391
2023	12,923
Thereafter	81,755
Total minimum lease payments	$	167,075

(1)

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Components of Income Tax Expense

The following summarizes the components of income tax expense:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Current taxes:
U.S. Federal	$	(1,088	)	$	2,565		$	4,808
U.S. State and local	1,182			(144		)	1,670
International	306			101			53
Total current taxes	400			2,522			6,531
Deferred taxes:
U.S. Federal	659			(17,128		)	4,782
U.S. State and local	45			398			304
International	(1,323		)	(1,084		)	329
Total deferred taxes	(619		)	(17,814		)	5,415
Total income tax provision	$	(219	)	$	(15,292	)	$	11,946

Schedule of Income Before Provision for Income Taxes

The following summarizes the components of income before provision for income taxes:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
U.S.	$	47,532		$	58,547		$	55,381
International	(2,910		)	(206		)	1,969
Income before provision for income taxes	$	44,622		$	58,341		$	57,350

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation between the effect of applying the federal statutory rate and the effective income tax rate used to calculate our income tax provision is as follows:



	Years ended December 31,
	2018		2017		2016
Federal statutory rate	21.0	%	35.0	%	35.0	%
Effect of:
State income taxes, net of federal benefit	4.1		1.8		4.2
Change in federal income tax rate applied to deferred tax balances	—		(43.1	)	—
Change in state income tax rate applied to deferred tax balances	(0.4	)	—		0.2
Unrecognized tax benefit	(2.6	)	1.5		0.1
State credits, net of federal benefit	(1.9	)	(1.4	)	(0.1	)
Change in valuation reserve (primarily state credit reserves)	0.4		(1.0	)	(1.4	)
Federal credits generated	(10.4	)	(5.8	)	(5.5	)
Foreign tax rate	0.2		0.2		(0.4	)
Acquisition costs	—		2.2		0.1
Section 162(m) limitation	4.2		2.5		1.5
Domestic production activities deduction	—		—		(1.1	)
Stock-based compensation	(17.4	)	(18.9	)	(12.1	)
FDII benefit	(0.7	)	—		—
Nondeductible meals, entertainment, and transportation	2.6		0.8		0.9
Other	0.4		—		(0.6	)
Income tax provision effective rate	(0.5	)%	(26.2	)%	20.8	%

Schedule of Deferred Tax Assets and Liabilities

The significant components of our deferred tax assets and liabilities were as follows:



	December 31,
(dollars in thousands)	2018			2017
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$	11,021		$	13,597
Federal, state and foreign tax credits	18,936			14,389
Intangible assets	1,041			693
Stock-based compensation	11,462			9,611
Accrued bonuses	973			1,001
Deferred revenue	854			505
Allowance for doubtful accounts	1,242			1,379
Other	5,607			4,770
Total deferred tax assets	51,136			45,945
Deferred tax liabilities relating to:
Intangible assets	(43,700		)	(47,997		)
Fixed assets	(4,444		)	(4,552		)
Costs of obtaining contracts	(19,573		)	(18,756		)
Capitalized software development costs	(19,469		)	(14,012		)
Other	(926		)	(995		)
Total deferred tax liabilities	(88,112		)	(86,312		)
Valuation allowance	(6,855		)	(7,205		)
Net deferred tax liability	$	(43,831	)	$	(47,572	)

Summary of Changes in Deferred Tax Asset Valuation Allowance

The following table illustrates the change in our deferred tax asset valuation allowance:



Years ended December 31,	Balance at beginning of year		Acquisition- related change		Charges to expense			Balance at end of year
(dollars in thousands)
2018	$	7,205	$	16	$	(366	)	$	6,855
2017	6,994		—		211			7,205
2016	7,911		—		(917		)	6,994

Summary of Changes in Unrecognized Tax Benefits

The following table sets forth the change to our unrecognized tax benefit for the years ended December 31, 2018, 2017 and 2016:



	Years ended December 31,
(dollars in thousands)	2018			2017			2016
Balance at December 31, 2017	$	5,160		$	3,145		$	3,024
Increases from prior period positions	104			1,860			23
Decreases in prior year positions	(413		)	(238		)	(17		)
Increases from current period positions	58			404			358
Lapse of statute of limitations	(1,205		)	(11		)	(243		)
Balance at December 31, 2018	$	3,704		$	5,160		$	3,145

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Awards Outstanding by Each Award Type

The following table sets forth the number of awards outstanding for each award type as of:



	Outstanding at December 31,
Award type	2018	2017
Restricted stock awards	1,263,510	1,257,574
Restricted stock units	459,673	493,248
Stock appreciation rights	60,871	212,506
Stock options	836	2,050

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense:



	Years ended December 31,
(in thousands)	2018		2017		2016
Included in cost of revenue:
Cost of recurring	$	2,464	$	1,627	$	1,676
Cost of one-time services and other	2,778		1,843		1,621
Total included in cost of revenue	5,242		3,470		3,297
Included in operating expenses:
Sales, marketing and customer success	9,285		6,381		3,844
Research and development	9,048		7,765		6,467
General and administrative	24,699		23,015		19,030
Total included in operating expenses	43,032		37,161		29,341
Total stock-based compensation expense	$	48,274	$	40,631	$	32,638

Summary of Unvested Restricted Stock Awards, Activity

The following table summarizes our unvested restricted stock awards as of December 31, 2018, and changes during the year then ended:



Restricted stock awards	Restricted stock awards		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	1,257,574		$	61.00
Granted	541,786		94.51
Vested	(420,688	)	57.56
Forfeited	(115,162	)	72.93
Unvested at December 31, 2018	1,263,510		75.46		8.1	$	79,475

(1)

The intrinsic value is calculated as the market value as of the end of the fiscal period.

Summary of Unvested Restricted Stock Units, Activity

The following table summarizes our unvested restricted stock units as of December 31, 2018, and changes during the year then ended:



Restricted stock units	Restricted stock units		Weighted average grant-date fair value		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Unvested at January 1, 2018	493,248		$	61.05
Granted	231,491		95.59
Forfeited	(24,507	)	79.85
Vested	(240,559	)	56.77
Unvested at December 31, 2018	459,673		79.78		8.4	$	28,913

(1)

The intrinsic value is calculated as the market value as of the end of the fiscal period.

Summary of Stock Appreciation Rights, Activity

The following table summarizes our outstanding SARs as of December 31, 2018, and changes during the year then ended:



Stock appreciation rights	Stock appreciation rights		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	212,506		$	23.01
Exercised	(151,635	)	23.31
Outstanding at December 31, 2018	60,871		22.24		0.8	$	2,475
Vested and exercisable at December 31, 2018	60,871		22.24		0.8	2,475

(1)

The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Summary of Stock Options, Activity

The following table summarizes our outstanding stock options as of December 31, 2018, and changes during the year then ended:



Stock options	Stock options		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value⁽¹⁾ (in thousands)
Outstanding at January 1, 2018	2,050		$	11.44
Exercised	(1,032	)	10.53
Expired	(182	)	10.59
Outstanding at December 31, 2018	836		12.75		0.7	$	42
Vested and exercisable at December 31, 2018	836		12.75		0.7	42

(1)

The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Changes in Accumulated Other Comprehensive Loss by Component

The changes in accumulated other comprehensive loss by component, consisted of the following:



	Years ended December 31,
(in thousands)	2018			2017			2016
Accumulated other comprehensive loss, beginning of period	$	(642	)	$	(604	)	$	(825	)
By component:
Gains and losses on cash flow hedges:
Accumulated other comprehensive income (loss) balance, beginning of period	$	748		$	(3	)	$	(19	)
Other comprehensive income (loss) before reclassifications, net of tax effects of $(239), $(374) and $406	670			574			(626		)
Amounts reclassified from accumulated other comprehensive loss to interest expense	(118		)	293			1,106
Tax benefit included in provision for income taxes	31			(116		)	(436		)
Total amounts reclassified from accumulated other comprehensive loss	(87		)	177			670
Net current-period other comprehensive income	583			751			44
Cumulative effect of adoption of ASU 2014-09	—			—			(28		)
Reclassification upon early adoption of ASU 2018-02	167			—			—
Accumulated other comprehensive income (loss) balance, end of period	$	1,498		$	748		$	(3	)
Foreign currency translation adjustment:
Accumulated other comprehensive loss balance, beginning of period	$	(1,390	)	$	(601	)	$	(806	)
Translation adjustments	(5,218		)	(789		)	205
Accumulated other comprehensive loss balance, end of period	(6,608		)	(1,390		)	(601		)
Accumulated other comprehensive loss, end of period	$	(5,110	)	$	(642	)	$	(604	)

Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Long-Lived Assets By Geographic Region

The following table presents long-lived assets by geographic region based on the location of the assets.



	Years ended December 31,
(dollars in thousands)	2018		2017
United States	$	37,015	$	39,071
Other countries	3,016		3,172
Total property and equipment	$	40,031	$	42,243

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Disaggregation of Revenue

Contract Balances

Deferred revenue



(dollars in thousands)	December 31, 2018		December 31, 2017
Recurring	$	286,960	$	265,513
One-time services and other	11,595		13,193
Total deferred revenue	298,555		278,706
Less: Long-term portion	2,564		3,643
Deferred revenue, current portion	$	295,991	$	275,063

Our opening and closing balances of contract assets and deferred revenue were as follows:



(in thousands)	December 31, 2018		December 31, 2017
Contract assets⁽¹⁾	$	308	$	—
Total deferred revenue	298,555		278,706

(1)

The following table presents our revenue by geographic area based on the address of our customers:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
United States	$	727,366	$	706,904	$	661,143
Other countries	121,240		81,583		70,499
Total revenue	$	848,606	$	788,487	$	731,642

The following table presents our revenue by market group:



	Years ended December 31,
(dollars in thousands)	2018		2017		2016
GMG	$	387,630	$	373,108	$	340,644
EMG	375,861		367,203		346,781
IMG	81,160		45,682		42,291
Other	3,955		2,494		1,926
Total revenue	$	848,606	$	788,487	$	731,642

Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



(dollars in thousands, except per share data)	December 31, 2018		September 30, 2018		June 30, 2018		March 31, 2018
Total revenue	$	221,218	$	209,532	$	213,672	$	204,184
Gross profit	117,922		114,295		118,500		116,147
Income from operations	14,679		15,783		11,374		17,581
Income before provision for income taxes	11,485		11,496		7,417		14,224
Net income	9,334		11,164		6,592		17,751
Earnings per share
Basic	$	0.20	$	0.24	$	0.14	$	0.38
Diluted	0.19		0.23		0.14		0.37

(dollars in thousands, except per share data)	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
Total revenue	$	217,402	$	194,424	$	191,589	$	185,072
Gross profit	114,980		107,419		104,594		99,590
Income from operations	19,959		18,423		16,523		13,273
Income before provision for income taxes	17,226		15,799		14,134		11,182
Net income	36,638		12,824		11,029		13,142
Earnings per share
Basic	$	0.78	$	0.27	$	0.24	$	0.28
Diluted	0.76		0.27		0.23		0.28

Note: The individual amounts for each quarter may not sum to full year totals due to rounding.

Restructuring (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Costs

The following table summarizes our facilities optimization restructuring costs as of December 31, 2018:



	Costs incurred during the year ended		Cumulative costs incurred as of
(in thousands)	December 31, 2018
By component:
Contract termination costs	$	3,581	$	4,176
Other costs	1,009		1,208
Total	$	4,590	$	5,384

Schedule of Restructuring Reserve by Type of Cost

The change in our liability related to our facilities optimization restructuring during the twelve months ended December 31, 2018, consisted of the following:



	Accrued at		Increases for incurred costs		Costs paid			Accrued at
(in thousands)	December 31, 2017		Increases for incurred costs		Costs paid			December 31, 2018
By component:
Contract termination costs	$	691	$	3,581	$	(2,407	)	$	1,865
Other costs	—		1,009		(959		)	50
Total	$	691	$	4,590	$	(3,366	)	$	1,915

Organization (Details)	Dec. 31, 2018 Customers
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Approximate number of customers distributed across verticals	45,000

Basis of Presentation (Details) - USD ($) $ in Thousands	12 Months Ended
Basis of Presentation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2016
Basis of Presentation [Line Items]
Expected period of benefit	5 years
Net foreign currency loss (gain)	$ 900	$ (1,100)	$ 900
Advertising costs	$ 4,000	2,400	2,300
Contract term of recurring revenue contracts at contract inception (years)	3 years
Impairment of goodwill	$ 0	0	0
Impairment of intangible assets (excluding goodwill)	0	0	0
Capitalized software development costs	0	0
Impairment of capitalized software dev costs	0	0
Impairment of long-lived assets	$ 0	$ 0	0
Minimum [Member]
Basis of Presentation [Line Items]
Contract term of recurring revenue contracts at renewal (years)	1 year
Maximum [Member]
Basis of Presentation [Line Items]
Contract term of recurring revenue contracts at renewal (years)	3 years
ASU 2016-09 [Member]
Basis of Presentation [Line Items]
Cumulative effect of a change in accounting principle				$ 606
Discrete tax benefit, stock-based compensation			$ 7,700
ASU 2016-02 [Member] \| Minimum [Member]
Basis of Presentation [Line Items]
Aggregate lease liabilities expected to recognize	$ 105,000
ASU 2016-02 [Member] \| Maximum [Member]
Basis of Presentation [Line Items]
Aggregate lease liabilities expected to recognize	$ 135,000
Software Development [Member] \| Minimum [Member]
Basis of Presentation [Line Items]
Software development costs, estimated useful life (years)	3 years
Software Development [Member] \| Maximum [Member]
Basis of Presentation [Line Items]
Software development costs, estimated useful life (years)	7 years
Retained earnings [Member] \| ASU 2016-09 [Member]
Basis of Presentation [Line Items]
Cumulative effect of a change in accounting principle				$ (934)

Basis of Presentation Basis of Presentation (Adoption of New Standard Impact on Previously Reported Quarterly Results) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

$ 86,595

$ 95,679

$ 86,595

$ 95,679

$ 88,261

59,788

61,978

59,788

61,978

54,211

65,363

57,238

65,363

57,238

52,097

275,063

243,849

44,291

48,023

44,291

48,023

43,475

246,477

225,029

246,477

225,029

174,409

Revenue

848,606

788,487

731,642

381,742

361,904

339,220

192,848

169,559

150,157

$ 9,334

$ 11,164

$ 6,592

$ 17,751

$ 36,638

$ 12,824

$ 11,029

$ 13,142

$ 44,841

$ 73,633

$ 45,404

$ 0.20

$ 0.24

$ 0.14

$ 0.38

$ 0.78

$ 0.27

$ 0.24

$ 0.28

$ 0.95

$ 1.58

$ 0.98

$ 0.19

$ 0.23

$ 0.14

$ 0.37

$ 0.76

$ 0.27

$ 0.23

$ 0.28

$ 0.93

$ 1.54

$ 0.96

As Reported [Member]

$ 96,293

$ 88,932

56,099

48,314

24,083

22,524

276,456

244,500

37,597

29,558

195,649

152,729

Revenue

^[1]

788,306

730,815

^[1]

361,904

339,220

173,525

155,754

$ 65,933

$ 41,515

$ 1.41

$ 0.90

ASU 2014-09 [Member] | Adjustments [Member]

$ 1.38

$ 0.88

(614)

$ (614)

$ (671)

5,879

5,897

33,155

29,573

(1,393)

(651)

10,426

13,917

$ 29,380

29,380

21,680

Revenue

181

827

(3,966)

(5,597)

$ 7,700

$ 3,889

$ 0.17

$ 0.08

$ 0.16

$ 0.08

Recurring [Member]

Revenue

$ 762,181

$ 684,583

$ 609,063

Recurring [Member] | As Reported [Member]

305,481

277,639

246,669

Revenue

^[1]

651,031

575,933

Recurring [Member] | ASU 2014-09 [Member] | Adjustments [Member]

^[1]

265,713

235,977

Revenue

33,552

33,130

One-time services and other [Member]

11,926

10,692

Revenue

86,425

103,904

122,579

One-time services and other [Member] | As Reported [Member]

$ 76,261

84,265

92,551

Revenue

^[1]

137,275

154,882

One-time services and other [Member] | ASU 2014-09 [Member] | Adjustments [Member]

^[1]

96,191

103,243

Revenue

(33,371)

(32,303)

Customer relationships [Member]

$ (11,926)

$ (10,692)

[1]	(1) See the discussion of our reclassifications of previously reported revenue and costs of revenue above.

Basis of Presentation (Finite-Lived Intangible Assets by Major Class) (Details)

12 Months Ended

Dec. 31, 2018

Finite-lived intangible assets, amortization method

Straight-line and accelerated

^[1]

Customer relationships [Member] | Minimum [Member]

Customer relationships [Member] | Maximum [Member]

4 years

Marketing assets [Member]

17 years

Finite-lived intangible assets, amortization method

Straight-line

Marketing assets [Member] | Minimum [Member]

Marketing assets [Member] | Maximum [Member]

1 year

Acquired software and technology [Member]

15 years

Finite-lived intangible assets, amortization method

Straight-line and accelerated

Acquired software and technology [Member] | Minimum [Member]

Acquired software and technology [Member] | Maximum [Member]

1 year

Non-compete agreements [Member]

11 years

Finite-lived intangible assets, amortization method

Straight-line

Non-compete agreements [Member] | Minimum [Member]

Non-compete agreements [Member] | Maximum [Member]

1 year

5 years

Database [Member]

Finite-lived intangible assets, amortization method

Straight-line

8 years

[1]	Certain of the customer relationships and acquired software and technology assets are amortized on an accelerated basis.

Basis of Presentation (Changes in Allowance for Sales Returns and Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for sales returns [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4,400	$ 2,704	$ 4,431
Provision/adjustment	4,952	10,511	3,060
Write-off	(5,975)	(8,815)	(4,787)
Balance at end of year	3,377	4,400	2,704
Allowance for doubtful accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	741	587	512
Provision/adjustment	2,446	1,148	499
Write-off	(1,842)	(994)	(424)
Balance at end of year	$ 1,345	$ 741	$ 587

Business Combinations (Details) £ in Millions, $ in Millions	Apr. 30, 2018 USD ($)	Oct. 02, 2017 USD ($)	Oct. 02, 2017 GBP (£)	Jun. 02, 2017 USD ($)	Apr. 03, 2017 USD ($)
Reeher [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition	$ 41.2
Estimated fair value of accounts receivable acquired	1.1
Goodwill, tax deductible amount	$ 11.7
JustGiving [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition		$ 137.2	£ 102.4
Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit				$ 110.0
Revolving Credit Facility [Member] \| JustGiving [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit		$ 138.7
Revolving Credit Facility [Member] \| AcademicWorks [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition					$ 52.1

Business Combinations (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 545,213		$ 530,249
Reeher [Member]
Business Acquisition [Line Items]
Net working capital, excluding deferred revenue		$ 1,683
Property and equipment		755
Finite-lived intangible assets		27,055
Deferred tax asset		713
Deferred revenue		(2,700)
Goodwill		13,681
Total purchase price		$ 41,187

Business Combinations (Acquired Intangible Assets) (Details) - Reeher [Member] $ in Thousands	Apr. 30, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 27,055
Weighted average amortization period (in years)	11 years
Acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 19,500
Weighted average amortization period (in years)	11 years
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 7,000
Weighted average amortization period (in years)	10 years
Marketing assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 480
Weighted average amortization period (in years)	3 years
Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 75
Weighted average amortization period (in years)	2 years

Goodwill and Other Intangible Assets (Change in Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2017	$ 530,249
Additions related to current year business combinations	18,271
Adjustments related to prior year business combinations	(333)
Effect of foreign currency translation	(2,974)
Balance at December 31, 2018	$ 545,213

Goodwill And Other Intangible Assets (Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 547,221	$ 524,007
Finite-lived intangible assets, accumulated amortization	(257,204)	(210,956)
Intangible assets, net (excluding goodwill)	291,617	314,651
Marketing assets [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill), gross carrying amount	1,600	1,600
Customer relationships [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	280,309	274,458
Finite-lived intangible assets, accumulated amortization	(116,648)	(96,662)
Marketing assets [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	48,484	49,661
Finite-lived intangible assets, accumulated amortization	(16,395)	(12,444)
Acquired software and technology [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	211,654	193,010
Finite-lived intangible assets, accumulated amortization	(118,268)	(96,528)
Non-compete agreements [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	2,499	2,603
Finite-lived intangible assets, accumulated amortization	(1,618)	(1,125)
Database [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	4,275	4,275
Finite-lived intangible assets, accumulated amortization	$ (4,275)	$ (4,197)

Goodwill and Other Intangible Assets (Summary of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	$ 47,077	$ 43,370	$ 42,398
Cost of recurring [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	39,877	37,557	36,597
Cost of one-time services and other [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	2,356	2,542	2,961
Total included in cost of revenue [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	42,233	40,099	39,558
Included in operating expenses [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	$ 4,844	$ 3,271	$ 2,840

Goodwill and Other Intangible Assets (Future Amortization Expense for Finite-Lived Intangible Assets) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Future amortization expense for finite-lived intangible assets:
2019	$ 45,266
2020	36,995
2021	31,453
2022	27,969
2023	26,213
Total	$ 167,896

Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 9,334	$ 11,164	$ 6,592	$ 17,751	$ 36,638	$ 12,824	$ 11,029	$ 13,142	$ 44,841	$ 73,633	$ 45,404
Weighted average common shares									47,206,669	46,669,440	46,132,389
Stock-based awards									838,415	1,106,262	1,184,149
Weighted average common shares assuming dilution									48,045,084	47,775,702	47,316,538
Earnings (Loss) Per Share, Basic and Diluted [Abstract]
Basic earnings per share	$ 0.20	$ 0.24	$ 0.14	$ 0.38	$ 0.78	$ 0.27	$ 0.24	$ 0.28	$ 0.95	$ 1.58	$ 0.98
Diluted earnings per share	$ 0.19	$ 0.23	$ 0.14	$ 0.37	$ 0.76	$ 0.27	$ 0.23	$ 0.28	$ 0.93	$ 1.54	$ 0.96
Shares excluded from calculations of diluted earnings per share									48,881	4,634	7,339

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair value measurements, recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 2,260	$ 1,283
Total financial assets	2,260	1,283
Derivative liabilities	186
Total financial liabilities	186
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Total financial assets	0	0
Derivative liabilities	0
Total financial liabilities	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,260	1,283
Total financial assets	2,260	1,283
Derivative liabilities	186
Total financial liabilities	186
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Total financial assets	0	$ 0
Derivative liabilities	0
Total financial liabilities	$ 0

Property and Equipment and Software Development Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 15.9	$ 17.8	$ 19.8
Software development costs, amortization	$ 16.6	$ 12.8	$ 8.3

Property and Equipment and Software Development Costs (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 147,629	$ 145,843
Less: accumulated depreciation	(107,598)	(103,600)
Property and equipment, net	40,031	42,243
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,243	2,728
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	2 years
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	5 years
Computer hardware [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 75,060	76,331
Computer hardware [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	2 years
Computer hardware [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	5 years
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 34,294	34,058
Computer software [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	2 years
Computer software [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	5 years
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 233	3,102
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,004	7,265
Furniture and fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	3 years
Furniture and fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (years)	10 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 26,795	$ 22,359

Property and Equipment and Software Development Costs (Schedule of Software Development Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Software development costs, gross	$ 121,983	$ 84,404
Less: accumulated amortization	(46,884)	(30,306)
Software development costs, net	$ 75,099	$ 54,098
Software Development [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Software development costs, estimated useful life (years)	3 years
Software Development [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Software development costs, estimated useful life (years)	7 years

Consolidated Financial Statement Details (Components of Prepaid Expenses and Other Assets) (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Costs of obtaining contracts

^[2]

$ 85,590

^[1]

$ 77,312

Prepaid software maintenance and subscriptions

21,134

17,402

Taxes, prepaid and receivable

2,055

10,548

Unbilled accounts receivable

2,260

1,283

^[3]

4,161

3,136

Security deposits

1,020

2,305

Total prepaid expenses and other assets

8,931

7,230

125,151

119,216

Less: Long-term portion

65,363

57,238

Amortization expense from costs of obtaining contracts

59,788

61,978

$ 54,211

35,700

Cost of obtaining contracts, current portion

$ 31,700

$ 28,000

[1]	Amortization expense from costs of obtaining contracts was $35.7 million for the year ended December 31, 2018.
[2]	The current portion of costs of obtaining contracts as of December 31, 2018 and 2017 was $31.7 million and $28.0 million, respectively.
[3]	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable.

Consolidated Financial Statement Details (Components of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued bonuses	$ 14,868	$ 16,743
Accrued commissions and salaries	9,934	6,943
Taxes payable	6,204	5,517
Deferred rent liabilities	4,332	4,548
Customer credit balances	4,076	4,652
Lease incentive obligations	3,514	4,635
Unrecognized tax benefit	2,719	1,972
Accrued vacation costs	2,352	2,458
Accrued health care costs	1,497	2,615
Other liabilities	6,785	9,948
Total accrued expenses and other liabilities	56,281	60,031
Less: Long-term portion	9,388	5,632
Accrued expenses and other current liabilities	$ 46,893	$ 54,399

Consolidated Financial Statement Details (Components of Deferred Revenue) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 298,555	$ 278,706
Less: Long-term portion	2,564	3,643
Deferred revenue, current portion	295,991	275,063
Recurring [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue	286,960	265,513
One-time services and other [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 11,595	$ 13,193

Consolidated Financial Statement Details (Components of Other Income and Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 2,008	$ 993	$ 581
Gain on derivative instrument	0	462	0
Loss on debt extinguishment	0	(299)	0
Other (expense) income, net	(905)	1,104	(872)
Other income (expense), net	$ 1,103	$ 2,260	$ (291)

Debt (Details) $ in Thousands			1 Months Ended		12 Months Ended
Debt (Details) $ in Thousands	Apr. 30, 2018 USD ($)	Jun. 02, 2017 USD ($)	Sep. 29, 2017 USD ($)	Feb. 28, 2014 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 700,000		$ 325,000
Debt instrument, term		5 years		5 years
Change in present value of future cash flows to financing investors				10.00%
Payment of financing costs		$ 3,100			$ 0	$ 3,085	$ 0
Capitalized financing costs to be amortized over term of facility		1,000
Total deferred financing costs included in other assets					900	1,200
Aggregate financing costs related to debt discount and debt issuance costs		1,800			$ (1,626)	$ (2,102)
Commitment fee on unused portion of revolving credit facility					0.20%
Line of credit facility, available increase capacity, amount		$ 200,000
Line of credit facility, current borrowing capacity					$ 296,200
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee on unused portion of revolving credit facility					0.15%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee on unused portion of revolving credit facility					0.25%
Net Leverage Ratio		3.00
Federal funds rate option [Member]
Line of Credit Facility [Line Items]
Credit facility, variable interest rate					0.50%
Eurocurrency base rate option [Member]
Line of Credit Facility [Line Items]
Credit facility, variable interest rate					1.00%
Base rate margin [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					0.00%
Base rate margin [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					0.75%
Eurocurrency rate margin [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					1.00%
Eurocurrency rate margin [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread on variable rate					1.75%
Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 400,000
Proceeds from lines of credit		110,000
Term loans [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		300,000
Proceeds from lines of credit		300,000
Standby letters of credit [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		50,000
Swingline loans [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		50,000
Multicurrency borrowings [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 100,000
Reeher [Member]
Line of Credit Facility [Line Items]
Total cash consideration paid for the acquisition	$ 41,200
Loans payable [Member]
Line of Credit Facility [Line Items]
Debt instrument, term			2 years
Other debt, face amount			$ 2,200

Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jun. 02, 2017
Line of Credit Facility [Line Items]
Debt, gross	$ 388,750	$ 440,326
Less: Unamortized discount and debt issuance costs	1,626	2,102	$ (1,800)
Less: Debt, current portion	7,500	8,576
Debt, net of current portion	$ 379,624	$ 429,648
Weighted average effective interest rate	3.61%	2.71%
Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 100,000	$ 143,000
Weighted average effective interest rate	4.13%	2.84%
Term loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 288,750	$ 296,250
Weighted average effective interest rate	3.44%	2.64%
Short-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	3.77%	3.03%
Long-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	3.61%	2.71%
Loans payable [Member]
Line of Credit Facility [Line Items]
Other debt	$ 0	$ 1,076
Weighted average effective interest rate	0.00%	4.50%

Debt (Annual Maturities Related to Credit Facility and Other Debt) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2019	$ 7,500
2020	7,500
2021	7,500
2022	366,250
2023	0
Thereafter	0
Total required maturities	$ 388,750

Derivative Instruments (Details)
$ in Thousands, £ in Millions

12 Months Ended

Dec. 31, 2018

USD ($)

Dec. 31, 2017

USD ($)

Dec. 31, 2016

USD ($)

Feb. 28, 2018

USD ($)

Sep. 27, 2017

GBP (£)

Jul. 31, 2017

USD ($)

Jun. 28, 2017

GBP (£)

Proceeds from settlement of derivative instruments

$ 0

$ 1,030

$ 0

Accumulated other comprehensive income expected to be reclassified into earnings within next 12 months

1,000

Ineffective portion of interest rate swap(s)

Undesignated derivative instruments

462

^[1]

$ 0

July 2017 Swap [Member]

February 2018 Swap [Member]

$ 150,000

June 2017 Foreign Currency Option [Member]

$ 50,000

October 2017 Foreign Currency Forward [Member]

£ 100.0

Not Designated as Hedging Instrument [Member]

£ 103.5

Derivative, fair value, net

$ 0

[1]	The individual amounts may not sum to total gain due to rounding.

Derivative Instruments (Fair Value of Derivative Instruments) (Details) - Designated as hedging instrument [Member] - Interest rate swap [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 2,260	$ 1,283
Derivative liabilities, fair value	186	0
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, current portion	0	145
Accrued expenses and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current portion	0	0
Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, long-term portion	2,260	1,138
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, long-term portion	$ 186	$ 0

Derivative Instruments (Effects of Derivative Instruments in Cash Flow Hedging Relationships) (Details) - Interest rate swap [Member] - Cash flow hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive loss	$ 2,074	$ 1,283	$ 42
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated other comprehensive loss into income	$ 118	$ (293)	$ (1,106)

Derivative Instruments (Effects of Undesignated Derivative Instruments) (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Foreign currency option contracts [Member]

$ 0

$ 462

^[1]

$ 0

Foreign currency forward contracts [Member]

513

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

$ (51)

[1]	The individual amounts may not sum to total gain due to rounding.

Commitments and Contingencies (Details) $ in Millions		1 Months Ended		12 Months Ended
Commitments and Contingencies (Details) $ in Millions	May 04, 2012 lease	May 31, 2016 USD ($) ft² lease	Oct. 31, 2008 lease	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Total minimum rentals to be received in the future under noncancelable subleases				$ 7.2
Total rent expense				22.2	$ 16.1	$ 11.7
Building [Member] \| Texas [Member]
Operating Leased Assets [Line Items]
Annual base rent of operating lease				2.4
Standby letter of credit for security deposit				1.0
Number of renewal options (leases) \| lease	2
Lease agreement renewal term	5 years
Building [Member] \| Texas [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent	4.00%
Building [Member] \| Texas [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent	2.00%
Leasehold improvements [Member]
Operating Leased Assets [Line Items]
Remaining aggregate reimbursable leasehold improvements				3.8
Customer Operations Center [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Reduction in rent expense						$ 2.9
Customer Operations Center [Member] \| Building [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Annual base rent of operating lease				4.3
Number of renewal options (leases) \| lease			2
Lease agreement renewal term			5 years
Customer Operations Center [Member] \| Building [Member] \| South Carolina [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent			5.50%
World Headquarters [Member] \| Building [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Rentable square feet (square foot) \| ft²		172,000
Annual base rent of operating lease		$ 4.4
Percentage of change in base rent		2.00%
Number of renewal options (leases) \| lease		4
Lease agreement renewal term		5 years
Third-party technology [Member]
Long-term Purchase Commitment [Line Items]
Remaining aggregate minimum purchase commitment				$ 109.9

Commitments and Contingencies (Future Minimum Lease Commitments Related to Lease Agreements, Net of Related Lease Incentives) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 20,808
2020	20,274
2021	16,924
2022	14,391
2023	12,923
Thereafter	81,755
Total minimum lease payments	$ 167,075

Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate	$ 3.3
Accrued interest and penalties	0.7	$ 0.8
Reasonably possible decrease in unrecognized tax benefits	1.4
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	24.3
Tax credit carryforwards	6.5
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	24.5
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards	25.1
Tax credit carryforwards	$ 14.1

Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. Federal	$ (1,088)	$ 2,565	$ 4,808
U.S. State and local	1,182	(144)	1,670
International	306	101	53
Total current taxes	400	2,522	6,531
U.S. Federal	659	(17,128)	4,782
U.S. State and local	45	398	304
International	(1,323)	(1,084)	329
Total deferred taxes	(619)	(17,814)	5,415
Total income tax provision	$ (219)	$ (15,292)	$ 11,946

Income Taxes (Schedule of Income Before Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S.									$ 47,532	$ 58,547	$ 55,381
International									(2,910)	(206)	1,969
Income before provision for income taxes	$ 11,485	$ 11,496	$ 7,417	$ 14,224	$ 17,226	$ 15,799	$ 14,134	$ 11,182	$ 44,622	$ 58,341	$ 57,350

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	35.00%	35.00%
Effect of:
State income taxes, net of federal benefit	4.10%	1.80%	4.20%
Unrecognized tax benefit	(2.60%)	1.50%	0.10%
State credits, net of federal benefit	(1.90%)	(1.40%)	(0.10%)
Change in valuation reserve (primarily state credit reserves)	0.40%	(1.00%)	(1.40%)
Federal credits generated	(10.40%)	(5.80%)	(5.50%)
Foreign tax rate	0.20%	0.20%	(0.40%)
Acquisition costs	0.00%	2.20%	0.10%
Section 162(m) limitation	4.20%	2.50%	1.50%
Domestic production activities deduction	0.00%	0.00%	(1.10%)
Stock-based compensation	(17.40%)	(18.90%)	(12.10%)
Effective Income Tax Rate Reconciliation, Deduction, TCJA FDII, Percent	(0.70%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	2.60%	0.80%	0.90%
Other	0.40%	0.00%	(0.60%)
Income tax provision effective rate	(0.50%)	(26.20%)	20.80%
Domestic Tax Authority [Member]
Effect of:
Change in income tax rate applied to deferred tax balances	0.00%	(43.10%)	0.00%
State and Local Jurisdiction [Member]
Effect of:
Change in income tax rate applied to deferred tax balances	(0.40%)	0.00%	0.20%

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$ 11,021	$ 13,597
Federal, state and foreign tax credits	18,936	14,389
Intangible assets	1,041	693
Stock-based compensation	11,462	9,611
Accrued bonuses	973	1,001
Deferred revenue	854	505
Allowance for doubtful accounts	1,242	1,379
Other	5,607	4,770
Total deferred tax assets	51,136	45,945
Deferred tax liabilities relating to:
Intangible assets	(43,700)	(47,997)
Fixed assets	(4,444)	(4,552)
Costs of obtaining contracts	(19,573)	(18,756)
Capitalized software development costs	(19,469)	(14,012)
Other	(926)	(995)
Total deferred tax liabilities	(88,112)	(86,312)
Valuation allowance	(6,855)	(7,205)	$ (6,994)	$ (7,911)
Net deferred tax liability	$ (43,831)	$ (47,572)

Income Taxes (Summary of Changes in Deferred Tax Asset Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 7,205	$ 6,994	$ 7,911
Acquisition-related change	16	0	0
Charges to expense	(366)	211	(917)
Balance at end of year	$ 6,855	$ 7,205	$ 6,994

Income Taxes (Summary of Changes in Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at December 31, 2017	$ 5,160	$ 3,145	$ 3,024
Increases from prior period positions	104	1,860	23
Decreases in prior year positions	(413)	(238)	(17)
Increases from current period positions	58	404	358
Lapse of statute of limitations	(1,205)	(11)	(243)
Balance at December 31, 2018	$ 3,704	$ 5,160	$ 3,145

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of authorized stock-based awards available (in shares)	4,347,224
Unvested awards, compensation cost not yet recognized	$ 74.1
Unvested awards, compensation cost not yet recognized, period of recognition (in years)	1 year 8 months 12 days
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years
Restricted stock vested, total fair value	$ 24.2	$ 19.4	$ 14.5
Restricted stock granted, weighted average grant date fair value	$ 94.51	$ 74.08	$ 53.59
Vesting period (in years)	4 years
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years
Restricted stock vested, total fair value	$ 13.7	$ 9.4	$ 6.7
Restricted stock granted, weighted average grant date fair value	$ 95.59	$ 72.19	$ 51.98
Vesting period (in years)	3 years
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	7 years
Options exercised, total intrinsic value	$ 12.4	$ 14.2	$ 10.7
Options vested, total fair value			$ 1.0
Vesting period (in years)	4 years
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years

Stock-Based Compensation (Summary of Awards Outstanding by Each Award Type) (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	1,263,510	1,257,574
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	459,673	493,248
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	60,871	212,506
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	836	2,050

Stock-Based Compensation (Summary of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 48,274	$ 40,631	$ 32,638
Cost of recurring [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	2,464	1,627	1,676
Cost of one-time services and other [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	2,778	1,843	1,621
Total included in cost of revenue [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	5,242	3,470	3,297
Sales, marketing and customer success [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	9,285	6,381	3,844
Research and development [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	9,048	7,765	6,467
General and administrative [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	24,699	23,015	19,030
Total included in operating expense [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 43,032	$ 37,161	$ 29,341

Stock-Based Compensation (Summary of Unvested Restricted Stock Awards, Activity) (Details) - Restricted stock awards [Member] - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Unvested, weighted average grant date fair value, beginning of period

1,257,574

$ 61.00

541,786

$ 94.51

$ 74.08

$ 53.59

(420,688)

$ 57.56

(115,162)

$ 72.93

Unvested, weighted average grant date fair value, end of period

1,263,510

1,257,574

$ 75.46

$ 61.00

Unvested, weighted average remaining contractual term

8 years 1 month 6 days

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

$ 79,475

[1]	The intrinsic value is calculated as the market value as of the end of the fiscal period.

Stock-Based Compensation (Summary of Unvested Restricted Stock Units, Activity) (Details) - Restricted stock units [Member] - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Unvested, weighted average grant date fair value, beginning of period

493,248

$ 61.05

231,491

$ 95.59

$ 72.19

$ 51.98

(24,507)

$ 79.85

(240,559)

$ 56.77

Unvested, weighted average grant date fair value, end of period

459,673

493,248

$ 79.78

$ 61.05

Unvested, weighted average remaining contractual term

8 years 4 months 24 days

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

$ 28,913

[1]	The intrinsic value is calculated as the market value as of the end of the fiscal period.

Stock-Based Compensation (Summary of Stock Appreciation Rights, Activity) (Details) - Stock appreciation rights (SARs) [Member]
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

USD ($)

$ / shares

Outstanding, weighted average exercise price, beginning of period | $ / shares

212,506

$ 23.01

Exercised, weighted average exercise price | $ / shares

(151,635)

$ 23.31

Outstanding, weighted average exercise price, end of period | $ / shares

60,871

$ 22.24

Outstanding, weighted average remaining contractual term

24 days

$ 2,475

^[1]

Vested and exercisable, weighted average exercise price | $ / shares

60,871

$ 22.24

Vested and exercisable, weighted average remaining contractual term

24 days

Vested and exercisable, aggregate intrinsic value | $

$ 2,475

^[1]

[1]	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares

Stock-Based Compensation (Summary of Stock Options, Activity) (Details) - Stock options [Member]
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2018

USD ($)

$ / shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Outstanding, weighted average exercise price, beginning of period | $ / shares

2,050

$ 11.44

Exercised, weighted average exercise price | $ / shares

(1,032)

$ 10.53

Expired, number | shares

(182)

Expired, weighted average exercise price | $ / shares

$ 10.59

Outstanding, weighted average exercise price, end of period | $ / shares

836

$ 12.75

Outstanding, weighted average remaining contractual term

21 days

$ 42

^[1]

Vested and exercisable, weighted average exercise price | $ / shares

836

$ 12.75

Vested and exercisable, weighted average remaining contractual term

21 days

Vested and exercisable, aggregate intrinsic value | $

$ 42

^[1]

[1]	The intrinsic value is calculated as the difference between the market value as of the end of the fiscal period and the exercise price of the shares.

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Dec. 14, 2018	Sep. 14, 2018	Jun. 15, 2018	Mar. 15, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 15, 2019	Aug. 31, 2010
Equity [Abstract]
Dividends paid per share (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.48	$ 0.48	$ 0.48
Stock repurchase program, authorized amount									$ 50.0
Stock repurchase program, remaining authorized repurchase amount					$ 50.0
Subsequent event [Member]
Dividends Payable [Line Items]
Dividends payable per share (in dollars per share)								$ 0.12

Stockholders' Equity (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017	Jan. 01, 2016
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	$ (642)	$ (604)	$ (825)
Reclassification upon early adoption of ASU 2018-02	0
Translation adjustments	(5,218)	(789)	205
Accumulated other comprehensive (loss) income, end of period	(5,110)	(642)	(604)
Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	748	(3)	(19)
Other comprehensive income (loss) before reclassifications	670	574	(626)
Amounts reclassified from accumulated other comprehensive loss to interest expense	(118)	293	1,106
Tax benefit included in provision for income taxes	31	(116)	(436)
Total amounts reclassified from accumulated other comprehensive loss	(87)	177	670
Net current-period other comprehensive income	583	751	44
Reclassification upon early adoption of ASU 2018-02	167	0	0
Accumulated other comprehensive (loss) income, end of period	1,498	748	(3)
Unrealized (losses) gains, tax effects	(239)	(374)	406
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	(1,390)	(601)	(806)
Translation adjustments	(5,218)	(789)	205
Accumulated other comprehensive (loss) income, end of period	$ (6,608)	$ (1,390)	$ (601)
ASU 2014-09 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect of adoption of ASU 2014-09						$ (17,763)
ASU 2014-09 [Member] \| Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect of adoption of ASU 2014-09				$ 0	$ 0	$ (28)

Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
Defined Contribution Plan (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of qualified employees' contribution	50.00%	50.00%	50.00%
Employer matching contributions, total	$ 8.1	$ 7.1	$ 7.6
Employer discretionary contributions, total	$ 0.0	$ 0.0	$ 0.0
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percent of salary	1.00%	1.00%	1.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percent of salary	75.00%	75.00%	75.00%
Employer matching contribution, percent of employees' salary	6.00%	6.00%	6.00%

Segment Information (Long-Lived Assets By Geographic Region) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 40,031	$ 42,243
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	37,015	39,071
Other countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 3,016	$ 3,172

Revenue Recognition Revenue Recognition (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 738
Revenue, remaining performance obligation, percentage to be recognized	60.00%
Revenue, remaining performance obligation, expected timing of satisfaction	12 months
Revenue recognized that was included in deferred revenue at beginning of period	$ 270

Revenue Recognition Revenue Recognition (Contract Balances) (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

Contract assets

^[1]

$ 308

$ 0

Total deferred revenue

$ 298,555

$ 278,706

[1]	Amounts previously presented as contract assets are now presented as unbilled accounts receivable as they meet the definition of a receivable. See Note 8 to these consolidated financial statements for additional details.

Revenue Recognition (Revenue by Geography) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 848,606	$ 788,487	$ 731,642
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	727,366	706,904	661,143
Other countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 121,240	$ 81,583	$ 70,499

Revenue Recognition (Revenue by Market Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 848,606	$ 788,487	$ 731,642
GMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	387,630	373,108	340,644
EMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	375,861	367,203	346,781
IMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	81,160	45,682	42,291
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 3,955	$ 2,494	$ 1,926

Quarterly Results (unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 221,218	$ 209,532	$ 213,672	$ 204,184	$ 217,402	$ 194,424	$ 191,589	$ 185,072
Gross profit	117,922	114,295	118,500	116,147	114,980	107,419	104,594	99,590	$ 466,864	$ 426,583	$ 392,422
Income from operations	14,679	15,783	11,374	17,581	19,959	18,423	16,523	13,273	59,417	68,178	68,224
Income before provision for income taxes	11,485	11,496	7,417	14,224	17,226	15,799	14,134	11,182	44,622	58,341	57,350
Net income	$ 9,334	$ 11,164	$ 6,592	$ 17,751	$ 36,638	$ 12,824	$ 11,029	$ 13,142	$ 44,841	$ 73,633	$ 45,404
Earnings per share, basic	$ 0.20	$ 0.24	$ 0.14	$ 0.38	$ 0.78	$ 0.27	$ 0.24	$ 0.28	$ 0.95	$ 1.58	$ 0.98
Earnings per share, diluted	$ 0.19	$ 0.23	$ 0.14	$ 0.37	$ 0.76	$ 0.27	$ 0.23	$ 0.28	$ 0.93	$ 1.54	$ 0.96

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.