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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2017	Feb. 05, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document type	10-K
Amendment flag	false
Document period end date	Dec. 31, 2017
Document fiscal year focus	2017
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 common stock, shares outstanding		48,078,048
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,727,937,653

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 29,830	$ 16,902
Restricted cash due to customers	610,344	353,771
Accounts receivable, net of allowance of $5,141 and $3,291 at December 31, 2017 and December 31, 2016, respectively	96,293	88,932
Customer funds receivable	1,536	0
Prepaid expenses and other current assets	56,099	48,314
Total current assets	794,102	507,919
Property and equipment, net	42,243	50,269
Software development costs, net	54,098	37,582
Goodwill	530,249	438,240
Intangible assets, net	314,651	253,676
Other assets	24,083	22,524
Total assets	1,759,426	1,310,210
Current liabilities:
Trade accounts payable	24,693	23,274
Accrued expenses and other current liabilities	54,399	54,196
Due to customers	611,880	353,771
Debt, current portion	8,576	4,375
Deferred revenue, current portion	276,456	244,500
Total current liabilities	976,004	680,116
Debt, net of current portion	429,648	338,018
Deferred tax liability	37,597	29,558
Deferred revenue, net of current portion	3,643	6,440
Other liabilities	5,632	8,533
Total liabilities	1,452,524	1,062,665
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, 58,551,761 and 57,672,401 shares issued at December 31, 2017 and December 31, 2016, respectively	59	58
Additional paid-in capital	351,042	310,452
Treasury stock, at cost; 10,475,794 and 10,166,801 shares at December 31, 2017 and December 31, 2016, respectively	(239,199)	(215,237)
Accumulated other comprehensive loss	(649)	(457)
Retained earnings	195,649	152,729
Total stockholders' equity	306,902	247,545
Total liabilities and stockholders' equity	$ 1,759,426	$ 1,310,210

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 5,141	$ 3,291
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	58,551,761	57,672,401
Treasury stock, shares	10,475,794	10,166,801

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue
Subscriptions	$ 522,865	$ 428,987	$ 331,759
Maintenance	128,166	146,946	153,801
Services and other	137,275	154,882	152,380
Total revenue	788,306	730,815	637,940
Cost of revenue
Cost of subscriptions	242,740	213,883	167,341
Cost of maintenance	22,973	22,094	27,066
Cost of services and other	96,191	103,243	110,224
Total cost of revenue	361,904	339,220	304,631
Gross profit	426,402	391,595	333,309
Operating expenses
Sales, marketing and customer success	173,525	155,754	123,646
Research and development	89,911	89,870	84,636
General and administrative	94,870	81,331	76,084
Amortization	3,271	2,840	2,231
Restructuring	794	0	0
Total operating expenses	362,371	329,795	286,597
Income from operations	64,031	61,800	46,712
Interest expense	(12,097)	(10,583)	(8,073)
Other income (expense), net	2,260	(291)	(1,687)
Income before provision for income taxes	54,194	50,926	36,952
Income tax provision	(11,739)	9,411	11,303
Net income	$ 65,933	$ 41,515	$ 25,649
Earnings per share
Basic earnings per share	$ 1.41	$ 0.90	$ 0.56
Diluted earnings per share	$ 1.38	$ 0.88	$ 0.55
Common shares and equivalents outstanding
Basic weighted average shares	46,669,440	46,132,389	45,623,854
Diluted weighted average shares	47,775,702	47,316,538	46,498,704
Dividends per share (in dollars per share)	$ 0.48	$ 0.48	$ 0.48
Other comprehensive income (loss)
Foreign currency translation adjustment	$ (943)	$ 324	$ 62
Unrealized gain on derivative instruments, net of tax	751	44	145
Total other comprehensive (loss) income	(192)	368	207
Comprehensive income	$ 65,741	$ 41,883	$ 25,856

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
Consolidated Statements of Cash Flows $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cash flows from operating activities
Net income	$ 65,933	$ 41,515	$ 25,649
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	73,948	70,491	55,997
Provision for doubtful accounts and sales returns	11,686	3,730	6,825
Stock-based compensation expense	40,631	32,638	25,246
Deferred taxes	(14,328)	3,033	3,165
Loss on sale of business	0	0	1,976
Impairment of capitalized software development costs	0	0	239
Amortization of deferred financing costs and discount	838	958	899
Other non-cash adjustments	504	(864)	(197)
Changes in operating assets and liabilities, net of acquisition and disposal of businesses:
Accounts receivable	(15,750)	(13,196)	(7,593)
Prepaid expenses and other assets	(6,149)	(2,478)	(10,979)
Trade accounts payable	1,024	3,689	6,133
Accrued expenses and other liabilities	(4,973)	(751)	9,255
Deferred revenue	22,926	14,863	12,612
Net cash provided by operating activities	176,290	153,628	129,227
Cash flows from investing activities
Purchase of property and equipment	(10,208)	(17,694)	(18,633)
Capitalized software development costs	(28,345)	(26,359)	(15,481)
Purchase of net assets of acquired companies, net of cash and restricted cash acquired	(146,789)	(3,377)	(106,720)
Net cash used in sale of business	0	0	(521)
Purchase of derivative instruments	(568)	0	0
Proceeds from settlement of derivative instruments	1,030	0	0
Net cash used in investing activities	(184,880)	(47,430)	(141,355)
Cash flows from financing activities
Proceeds from issuance of debt	774,500	227,200	312,300
Payments on debt	(679,119)	(293,575)	(184,475)
Debt issuance costs	(3,085)	0	(429)
Employee taxes paid for withheld shares upon equity award settlement	(23,962)	(15,376)	(9,421)
Proceeds from exercise of stock options	15	16	32
Change in due to customers	226,717	96,000	34,279
Change in customer funds receivable	6,644	0	0
Dividend payments to stockholders	(23,069)	(22,811)	(22,508)
Net cash provided by (used in) financing activities	278,641	(8,546)	129,778
Effect of exchange rate on cash, cash equivalents, and restricted cash	(550)	2,622	(2,695)
Net increase in cash, cash equivalents, and restricted cash	269,501	100,274	114,955
Cash, cash equivalents, and restricted cash, beginning of year	370,673	270,399	155,444
Cash, cash equivalents, and restricted cash, end of year	640,174	370,673	270,399
Supplemental disclosure of cash flow information
Interest paid	(10,614)	(9,608)	(7,208)
Income taxes paid, net of refunds	(5,613)	(1,340)	(4,795)
Purchase of equipment and other assets included in accounts payable	(1,546)	(3,155)	(3,204)
Acquired restricted cash liabilities due to customers	31,644	0	$ 81,353
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	29,830	16,902
Restricted cash due to customers	610,344	353,771
Total cash, cash equivalents and restricted cash in the statement of cash flows	$ 640,174	$ 370,673

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, 2014		56,048,135
Balance at Dec. 31, 2014	$ 185,916	$ 56	$ 245,674	$ (190,440)	$ (1,032)	$ 131,658
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,649					25,649
Payment of dividends	(22,508)					(22,508)
Exercise of stock options and stock appreciation rights and vesting of restricted stock units (in shares)		202,078
Exercise of stock options and stock appreciation rights and vesting of restricted stock units	32		32
Employee taxes paid for withheld shares upon equity award settlement	(9,421)			(9,421)
Excess tax benefits from exercise and vesting of stock-based compensation	5,466		5,466
Stock-based compensation	25,246		25,168			78
Restricted stock grants (in shares)		736,252
Restricted stock grants	1	$ 1
Restricted stock cancellations (in shares)		(112,648)
Other comprehensive income	207				207
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]
Cumulative effect of a change in accounting principle	606		1,540			(934)
Net income	41,515					41,515
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	368				368
Balance (in shares) at Dec. 31, 2016		57,672,401
Balance at Dec. 31, 2016	247,545	$ 58	310,452	(215,237)	(457)	152,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,933					65,933
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	(192)				(192)
Balance (in shares) at Dec. 31, 2017		58,551,761
Balance at Dec. 31, 2017	$ 306,902	$ 59	$ 351,042	$ (239,199)	$ (649)	$ 195,649

Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Employee taxes paid for withheld shares upon equity award settlement (in shares)	308,993	263,730	163,017

Organization

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

1. Organization

We are the world’s leading cloud software company powering social good. Serving the entire social good community—nonprofits, foundations, corporations, education institutions, healthcare institutions and individual change agents—we connect and empower organizations to increase their impact through software, services, expertise, and data intelligence. Our portfolio is tailored to the unique needs of vertical markets, with solutions for fundraising and CRM, marketing, advocacy, peer-to-peer fundraising, corporate social responsibility, school management, ticketing, grantmaking, financial management, payment processing, and analytics. Serving the industry for more than three decades, we are headquartered in Charleston, South Carolina and have operations in the United States, Australia, Canada and the United Kingdom. As of December 31, 2017, we had over 40,000 customers.

Basis of Presentation

12 Months Ended

Dec. 31, 2017

Accounting Policies [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”).

During the three months ended September 30, 2017, we identified prior period errors whereby amounts of current assets recorded as restricted cash due to customers and amounts of current liabilities recorded as due to customers were overstated by $8.5 million, $7.2 million and $21.3 million as of September 30, 2016, March 31, 2017 and June 30, 2017, respectively. There was no impact to our earnings or operating cash flows as a result of these errors. We concluded these errors were not material individually or in the aggregate to any of the prior reporting periods, and, therefore, amendments of previously filed reports were not required. However, the revisions for these corrections to the applicable prior periods are reflected in the financial information herein and will be reflected in future filings containing such financial information for such periods.

Reclassifications

Due to the insignificance of our revenue from "license fees and other," we have combined that revenue with our "services" revenue beginning in 2017. In order to provide comparability between periods presented, "services" and "license fees and other" have been combined within "services and other" in the previously reported consolidated statements of comprehensive income to conform to presentation of the current period. Similarly, "cost of services" and "cost of license fees and other" have been combined within "cost of services and other" in the previously reported consolidated statements of comprehensive income to conform to presentation of the current period.

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, deferred sales commissions and professional services costs, valuation of derivative instruments and loss contingencies. Changes in the facts or circumstances underlying these estimates could result in material changes and actual results could materially differ from these estimates.

Reportable segment and reporting unit

The Company reports operating results and financial information in one operating and reportable segment. Prior to the fourth quarter of 2017, our three market groups represented our three operating and reportable segments. In light of the increasing centralization of our operations, including without limitation, marketing, finance, sales excellence, human resources, corporate IT, legal and contracting, real estate and facilities, research and development, customer support, customer success, product management, professional services and training services, we made changes to our internal reporting structure in the fourth quarter of 2017 to better support and assess the operations of our business going forward. As a result, commencing with the fourth quarter of 2017, a measure of profitability is no longer available at the market group level and our chief operating decision maker now uses consolidated financial information to make operating decisions, assess financial performance and allocate resources. Our chief operating decision maker is our chief executive officer ("CEO"). We assessed the resulting effect on our operating segments, reportable segments, as well as our reporting units for annual goodwill impairment testing, and determined that we now have one operating segment, one reportable segment and one reporting unit.

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 transaction and payment processing services; (iii) providing professional services including implementation, training, consulting, analytic, and other services; and (iv) providing software maintenance and support services.

We commence revenue recognition when all of the following conditions are met:

•Persuasive evidence of an arrangement exists;

•The solutions or services have been or are being provided to the customer;

•The fee is fixed or determinable; and

•Collection of the resulting receivable is probable.

Determining whether and when these criteria have been met can require significant judgment and estimates. We deem acceptance of a contract to be evidence of an arrangement. Delivery of our services occurs when the services have been performed. Delivery of our solutions occurs when the solution is shipped or made available to the customers. Our typical arrangements do not include customer acceptance provisions; however, if acceptance provisions are provided, delivery is deemed to occur upon acceptance. We consider the fee to be fixed or determinable unless the fee is subject to refund or adjustment or is not payable within our standard payment terms. Payment terms greater than 90 days are considered to be beyond our customary payment terms. Collection is deemed probable if we expect that the customer will be able to pay amounts under the arrangement as they become due. If we determine that collection is not probable, we defer revenue recognition until collection. Revenue is recognized net of actual and estimated sales returns and allowances.

We follow guidance provided in ASC 605-45, Principal Agent Considerations, which states that determining whether a company should recognize revenue based on the gross amount billed to a customer or the net amount retained is a matter of judgment that depends on the facts and circumstances of the arrangement and that certain factors should be considered in the evaluation.

Subscriptions

We provide software solutions to customers which are available for use in cloud-based subscription arrangements without licensing perpetual rights to the software (“cloud-based solutions”). Revenue from cloud-based solutions is recognized ratably beginning on the activation date over the term of the agreement, which generally ranges from one to three years. Any revenue related to upfront activation or set-up fees is deferred and recognized ratably over the estimated period that the customer benefits from the related cloud-based solution. Direct and incremental costs related to upfront activation or set-up activities for cloud-based solutions are capitalized until the cloud-based solution is deployed and in use, and then expensed ratably over the estimated period that the customer benefits from the related cloud-based solution.

We offer certain payment processing services with the assistance of third-party vendors. In general, when we are the principal in a transaction based on the predominant weighting of factors identified in ASC 605-45, 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 amount billed to the customer and record the net amount as revenue. Revenue directly associated with processing donations for customers and our other transaction processing services is recognized when the service is provided and the amounts are determinable.

We provide hosting services to customers who have purchased perpetual rights to certain of our software solutions (“hosting services”). Revenue from hosting services, online training programs, as well as subscription-based analytic services such as data enrichment and data management services, is recognized ratably beginning on the activation date over the term of the agreement, which generally ranges from one to three years. Any related set-up fees are recognized ratably over the estimated period that the customer benefits from the related hosting service. The estimated period of benefit is evaluated on an annual basis using historical customer retention information by solution or service.

For arrangements that have multiple elements and do not include software licenses, we allocate arrangement consideration at the inception of the arrangement to those elements that qualify as separate units of accounting. The arrangement consideration is allocated to the separate units of accounting based on relative selling price method in accordance with the selling price hierarchy, which includes: (i) vendor specific objective evidence (“VSOE”) of fair value if available; (ii) third-party evidence (“TPE”) if VSOE is not available; and (iii) best estimate of selling price (“BESP”) if neither VSOE nor TPE is available. In general, we use VSOE to allocate the selling price to subscription and service deliverables.

Maintenance

We recognize revenue from maintenance services ratably over the term of the arrangement, generally one year at contract inception with annual renewals thereafter. Maintenance contracts are at rates that vary according to the level of the maintenance program associated with the software solution and are generally renewable annually. Maintenance contracts may also include the right to unspecified solution upgrades on an if-and-when available basis. Certain incremental support services are sold in prepaid units of time and recognized as revenue upon their usage. We determine VSOE of fair value of the various elements using different methods. VSOE of fair value for maintenance services associated with software licenses is based upon renewal rates stated in the arrangements with customers, which demonstrate a consistent relationship of maintenance pricing as a percentage of the contractual license fee.

Services

We generally bill consulting, installation and implementation services based on hourly rates plus reimbursable travel-related expenses. Revenue is recognized for these services over the period the services are delivered.

We recognize analytic services revenue from donor prospect research engagements, the sale of lists of potential donors, benchmarking studies and data modeling service engagements upon delivery. In arrangements where we provide customers the right to updated information during the contract period, revenue is recognized ratably over the contract period.

We sell fixed-rate programs, which permit customers to attend unlimited training over a specified contract period, typically one year, subject to certain restrictions, and revenue in those cases is recognized ratably over the contract period. Additionally, 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.

VSOE of fair value of professional services and other solutions and services is based on the average selling price of these same solutions and services to other customers when sold on a stand-alone basis.

Deferred revenue

To the extent that our customers are billed for the above described solutions and services in advance of delivery, we record such amounts in deferred revenue. Generally, our subscription and maintenance customers are billed one year in advance.

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, 2017, 2016 and 2015, 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, 2017, 2016 and 2015.

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.

As discussed above, we made changes to our internal reporting structure in the fourth quarter of 2017 to better support and assess the operations of our business going forward. As a result, we now have one operating segment, one reportable segment, and one reporting unit. As a result of the change in reporting units, we performed quantitative goodwill impairment tests immediately before and after this change in reporting units and determined that there was no impairment.

In each of 2017, 2016, and 2015, 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 2017, 2016 or 2015.

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⁾	8-17
Marketing assets	Straight-line	2-15
Acquired software and technology	Straight-line and accelerated⁽²⁾	5-10
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships are amortized on an accelerated basis.


(2)	Certain of the 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 not be recoverable. If the carrying amount 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 2017, 2016 or 2015.

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, 2017 and 2015, we recorded insignificant net foreign currency gains. For the year ended December 31, 2016, we recorded an insignificant net foreign currency loss.

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, 2017 and 2016.

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, 2017 and December 31, 2016. During the year ended December 31, 2015, we recorded insignificant impairment charges against previously capitalized software development costs. The charge reduced the carrying value of the certain previously capitalized software development costs to zero and are reflected in research and development expense. The impairment charge resulted from obtaining software solutions through the acquisition of Smart Tuition in 2015, and our determination that it was no longer probable that certain internal-use software that was previously being developed would be placed into service.

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
2017	$	2,704	$	10,511	$	(8,815	)	$	4,400
2016	4,431		3,060		(4,787		)	2,704
2015	4,185		5,834		(5,588		)	4,431

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
2017	$	587	$	1,148	$	(994	)	$	741
2016	512		499		(424		)	587
2015	354		699		(541		)	512

Sales commissions

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. To the extent that these commissions relate to revenue not yet recognized, the amounts are recorded as deferred sales commission costs. Subsequently, the commissions are recognized as sales, marketing and customer success expense as the revenue is recognized.

Below is a summary of the changes in our deferred sales commission costs included in prepaid expenses and other current assets.



Years ended December 31, (in thousands)	Balance at beginning of year		Additions		Expense			Balance at end of year
2017	$	37,459	$	35,420	$	(31,465	)	$	41,414
2016	30,141		37,553		(30,235		)	37,459
2015	22,630		55,934		(48,423		)	30,141

Advertising costs

We expense advertising costs as incurred, which was $2.4 million, $2.3 million and $2.3 million for the years ended December 31, 2017, 2016 and 2015, 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 20 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 2017 or 2016. No impairment of long-lived assets occurred in 2015 except for the impairment of previously capitalized software development costs discussed above.

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.

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 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718) - Scope of Modification Accounting ("ASU 2017-09"), which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. Under ASU 2017-09, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. ASU 2017-09 is effective for all companies for annual and interim periods beginning after December 15, 2017, with early adoption permitted in any interim period for reporting periods for which financial statements have not been issued. ASU 2017-09 should be applied prospectively to an award modified on or after the adoption date. We early adopted ASU 2017-09 as of April 1, 2017. As this standard is prospective in nature, the impact to our financial statements will depend on the nature of our future award modifications.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business ("ASU 2017-01"), which provides a screen to determine when an integrated set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. ASU 2017-01 is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted, and applied prospectively. We early adopted ASU 2017-01 as of July 1, 2017 and the standard did not have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Accounting for Goodwill Impairment ("ASU 2017-04"), which removes the requirement to perform a hypothetical purchase price allocation to measure goodwill impairment. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted, and applied prospectively. We early adopted ASU 2017-04 as of July 1, 2017 and used it in our fourth quarter annual goodwill impairment testing and the standard did not have a material impact on our consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash ("ASU 2016-18"), which requires entities to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. ASU 2016-18 is effective for annual periods beginning after December 15, 2017, with early adoption is permitted. The new standard must be adopted retrospectively.

We early adopted ASU 2016-18 during the three months ended December 31, 2017. We retrospectively applied the changes in presentation to the statements of cash flows and no longer classify changes in restricted cash due to customers and due to customers as operating activities. Instead, changes in due to customers are now classified as financing activities. The prior period financial statements included in this filing have been adjusted to reflect the corrections of the immaterial errors to amounts recorded as restricted cash due to customers and due to customers (as discussed above) as well as our adoption of ASU 2016-18. The effects of those adjustments have been provided in summarized format below.



Consolidated statements of cash flows:
	Nine months ended September 30, 2017						Six months ended June 30, 2017						Three months ended March 31, 2017
(dollars in thousands)	As Reported			As Adjusted			As Reported			As Adjusted			As Reported			As Adjusted
Net cash (used in) provided by financing activities	$	(45,306	)	$	(259,550	)	$	15,286		$	(70,295	)	$	(6,776	)	$	(202,775	)
Net increase (decrease) in cash and cash equivalents and restricted cash	148			(214,528		)	366			(85,465		)	(3,030		)	(199,228		)

	Twelve months ended December 31, 2016						Nine months ended September 30, 2016						Twelve months ended December 31, 2015
(dollars in thousands)	As Reported			As Adjusted			As Reported			As Adjusted			As Reported			As Adjusted
Net cash used in investing activities	$	(47,430	)	$	(47,430	)	$	(37,914	)	$	(37,914	)	$	(222,707	)	$	(141,355	)
Net cash (used in) provided by financing activities	(104,546		)	(8,546		)	(61,176		)	(188,980		)	95,499			129,778
Net increase (decrease) in cash and cash equivalents and restricted cash	1,540			100,274			1,100			(124,345		)	627			114,955

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. For lessors, the standard modifies the classification criteria and the accounting for sales-type and direct financing leases. All entities will classify leases to determine how to recognize lease-related revenue and expense. Classification will continue to affect amounts that lessors record on the balance sheet. ASU 2016-02 is effective for annual periods beginning after December 15, 2018, and interim periods within those years. Early adoption is permitted. Upon adoption, entities will be required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply. We expect ASU 2016-02 will impact our consolidated financial statements and are currently evaluating the extent of the impact that implementation of this standard will have on adoption.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"). ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard also provides guidance on the recognition of costs related to obtaining customer contracts. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. ASU 2014-09 will be effective for us beginning in the first quarter of 2018, and we anticipate using the full retrospective transition method.

We are currently evaluating the impact that the adoption of ASU 2014-9 will have on our consolidated financial statements and related disclosures. As a result of our evaluation to date, we believe that the primary impact on our financial statements of adopting ASU 2016-09 will relate to the deferral of incremental commission and other costs of obtaining contracts with customers. Currently, we defer only direct and incremental commission costs to obtain a contract and generally amortize those costs over the contract term as the revenue was recognized, typically three years. Under the new standard, we will defer all incremental commission and fringe benefit costs to obtain a contract and amortize those 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 approximately five years. We generally only pay commissions for contract renewals in limited circumstances.

We also anticipate incremental disclosures, including, but not limited to, the opening and closing balances of contract assets and liabilities, revenue recognized in the reporting period that was included in the contract liability balance at the beginning of the period, and the aggregate amount of the transaction price allocated to remaining performance obligations at the end of each reporting period including when we expect to recognize that amount.

Business Combinations

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Business Combinations

3. Business Combinations

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. During 2017, we incurred acquisition-related expenses associated with the acquisition of JustGiving of $4.2 million, which are recorded in general and administrative expense. We financed the acquisition of JustGiving through cash on hand and borrowings of $138.7 million under the 2017 Credit Facility (as defined in Note 9 of these consolidated financial statements).

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 acquired finite-lived 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	$	10,496
Finite-lived intangible assets	73,184
Other long-term assets	4,314
Deferred tax liability	(7,549		)
Deferred revenue	(245		)
Other long-term liabilities	(332		)
Goodwill	57,341
Total purchase price	$	137,209

The estimated fair value of accounts receivable acquired approximates the contractual value of $1.7 million. The estimated goodwill recognized is attributable primarily to the opportunities for expected synergies from combining the operations and assembled workforce of JustGiving. Only an insignificant portion of the goodwill arising in the acquisition is deductible for income tax purposes.

The JustGiving acquisition resulted in the identification of the following identifiable finite-lived intangible assets:



	Intangible assets acquired		Weighted average amortization period
AcademicWorks	(in thousands)		(in years)
Marketing assets	$	32,000	15
Acquired technology	21,000		10
Customer relationships	20,000		15
Non-compete agreements	184		1
Total intangible assets	$	73,184	14

The estimated fair values of the finite-lived 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.

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. During 2017, we incurred insignificant acquisition-related expenses associated with the acquisition of AcademicWorks, which were recorded in general and administrative expense.



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	2,949
Property and equipment	290
Finite-lived intangible assets	30,900
Deferred revenue	(3,950		)
Deferred tax liability	(12,350		)
Goodwill	34,305
Total purchase price	$	52,144

The estimated fair value of accounts receivable acquired approximates the contractual value of $1.0 million. The estimated goodwill recognized is attributable primarily to the opportunities for expected synergies from combining the operations and assembled workforce of AcademicWorks. None of the goodwill arising in the acquisition is deductible for income tax purposes.

The AcademicWorks acquisition resulted in the identification of the following identifiable finite-lived intangible assets:



	Intangible assets acquired		Weighted average amortization period
AcademicWorks	(in thousands)		(in years)
Acquired technology	$	22,500	9
Customer relationships	8,000		15
Marketing assets	320		2
Non-compete agreements	80		3
Total intangible assets	$	30,900	10

2016 Acquisition

Attentive.ly

On July 11, 2016, we acquired all of the outstanding equity, including all voting equity interests of Good+Geek, Inc., a Delaware corporation doing business as "Attentive.ly." Attentive.ly provides social media capabilities allowing organizations to conduct social listening, identify key influencers and drive engagement through its cloud solution. The acquisition accelerated our ability to deliver these capabilities to our customers. We acquired Attentive.ly for $3.9 million in cash, net of closing adjustments. As a result of the acquisition, Attentive.ly became a wholly-owned subsidiary of ours. We finalized the purchase price allocation of Attentive.ly, including the valuation of assets acquired and liabilities assumed, during the second quarter of 2017. 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.

2015 Acquisition

Smart Tuition

On October 2, 2015, we completed our acquisition of all of the outstanding equity, including all voting equity interests, of Smart, LLC (“Smart Tuition”). Smart Tuition is a leading provider of payment software and services for private schools and parents. The acquisition of Smart Tuition further expanded our offerings in the K-12 technology sector. We acquired Smart Tuition for $187.3 million in cash. As a result of the acquisition, Smart Tuition became a wholly-owned subsidiary of ours. Because we have integrated the operations of Smart Tuition into ours, it is impracticable to determine the revenue and operating income attributable solely to the acquired business. We financed the acquisition of Smart Tuition through cash on hand and borrowings of $186.0 million under our 2014 Credit Facility (as defined in Note 9 below).

The following unaudited pro forma condensed combined consolidated results of operations assume that the acquisition of Smart Tuition occurred on January 1, 2014. This unaudited pro forma financial information does not reflect any adjustments for anticipated synergies resulting from the acquisition and should not be relied upon as being indicative of the historical results that would have been attained had the transaction been consummated as of January 1, 2014, or of the results that may occur in the future. The unaudited pro forma information reflects adjustments for amortization of intangibles related to the fair value adjustments of the assets acquired, write-down of acquired deferred revenue to fair value, additional interest expense related to the financing of the transaction and the related tax effects of the adjustments.



	Years ended December 31,
(dollars in thousands, except per share amounts)	2015
Revenue	$	666,131
Net income	$	26,334
Basic earnings per share	$	0.58
Diluted earnings per share	$	0.57

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

4. Goodwill and Other Intangible Assets

The change in our goodwill during 2017 consisted of the following:



(dollars in thousands)	Total
Balance at December 31, 2016	$	438,240
Additions related to current year business combinations	91,646
Adjustments related to prior year business combination	(87		)
Effect of foreign currency translation	450
Balance at December 31, 2017	$	530,249

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)	2017			2016
Finite-lived gross carrying amount
Customer relationships	$	274,458		$	248,287
Marketing assets	49,661			16,187
Acquired software and technology	193,010			147,269
Non-compete agreements	2,603			3,493
Database	4,275			4,275
Total finite-lived gross carrying amount	524,007			419,511
Accumulated amortization
Customer relationships	(96,662		)	(77,983		)
Marketing assets	(12,444		)	(9,826		)
Acquired software and technology	(96,528		)	(74,975		)
Non-compete agreements	(1,125		)	(1,553		)
Database	(4,197		)	(4,093		)
Total accumulated amortization	(210,956		)	(168,430		)
Indefinite-lived gross carrying amount
Marketing assets	1,600			2,595
Intangible assets, net	$	314,651		$	253,676

Changes to the gross carrying amounts of intangible asset classes during 2017 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)	2017		2016		2015
Included in cost of revenue:
Cost of subscriptions	$	32,399	$	31,270	$	23,075
Cost of maintenance	5,158		5,327		4,162
Cost of services and other	2,542		2,961		2,750
Total included in cost of revenue	40,099		39,558		29,987
Included in operating expenses	3,271		2,840		2,231
Total amortization of intangibles from business combinations	$	43,370	$	42,398	$	32,218

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, 2017:



Years ending December 31, (dollars in thousands)	Amortization expense
2018	$	46,044
2019	43,596
2020	35,132
2021	29,322
2022	25,540
Total	$	179,634

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Earnings Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

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)	2017		2016		2015
Numerator:
Net income	$	65,933	$	41,515	$	25,649
Denominator:
Weighted average common shares	46,669,440		46,132,389		45,623,854
Add effect of dilutive securities:
Stock-based awards	1,106,262		1,184,149		874,850
Weighted average common shares assuming dilution	47,775,702		47,316,538		46,498,704
Earnings per share:
Basic	$	1.41	$	0.90	$	0.56
Diluted	$	1.38	$	0.88	$	0.55

Anti-dilutive shares excluded from calculations of diluted earnings per share	4,634		7,339		18,554

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

6. Fair Value Measurements

Recurring fair value measurements

Financial assets and liabilities 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, 2017
Financial assets:
Derivative instruments	$	—	$	1,283	$	—	$	1,283
Total financial assets	$	—	$	1,283	$	—	$	1,283

Fair value as of December 31, 2016
Financial assets:
Derivative instruments	$	—	$	206	$	—	$	206
Total financial assets	$	—	$	206	$	—	$	206

Fair value as of December 31, 2016
Financial liabilities:
Derivative instruments	$	—	$	163	$	—	$	163
Total financial liabilities	$	—	$	163	$	—	$	163

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, as well as foreign currency forward and option contracts.

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.

Our foreign currency forward and option contracts are valued using standard calculations/models that use as their basis readily observable market parameters including, foreign currency exchange rates, volatilities, and interest rates. Therefore, our foreign currency forward and option contracts are classified within Level 2 of the fair value hierarchy.

We believe the carrying amounts of our cash and cash equivalents, donor restricted cash, accounts receivable, customer funds receivable, trade accounts payable, accrued expenses and other current liabilities and due to customers approximate their fair values at December 31, 2017 and December 31, 2016, 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, 2017 and December 31, 2016, 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, 2017, 2016 and 2015. Additionally, we did not hold any Level 3 assets or liabilities during the years ended December 31, 2017, 2016 and 2015.

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, were based on Level 3 unobservable inputs. In the event of an impairment, we determine the fair value of the goodwill and intangible assets 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.

There were no non-recurring fair value adjustments to intangible assets and goodwill during 2017, 2016 and 2015 except for certain business combination accounting adjustments to the initial fair value estimates of the assets acquired and liabilities assumed at the acquisition date (see Note 3 to these consolidated financial statements) from updated estimates and assumptions during the measurement period. 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, 2017

Property, Plant and Equipment [Abstract]

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)	2017			2016
Equipment	2 - 5	$	2,728		$	2,403
Computer hardware	2 - 5	76,331			81,260
Computer software	2 - 5	34,058			31,604
Construction in progress	—	3,102			2,972
Furniture and fixtures	3 - 10	7,265			7,989
Leasehold improvements	Lesser of lease term or 10 years	22,359			19,942
Total property and equipment		145,843			146,170
Less: accumulated depreciation		(103,600		)	(95,901		)
Property and equipment, net		$	42,243		$	50,269

Depreciation expense was $17.8 million, $19.8 million, and $18.5 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Property and equipment, net of depreciation, under capital leases at December 31, 2017 and 2016 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)	2017			2016
Software development costs	3 - 7	$	84,404		$	55,126
Less: accumulated amortization		(30,306		)	(17,544		)
Software development costs, net		$	54,098		$	37,582

Amortization expense related to software development costs was $12.8 million, $8.3 million, and $5.4 million for the years ended December 31, 2017, 2016 and 2015, respectively, and is included primarily in cost of subscriptions.

Consolidated Financial Statement Details

12 Months Ended

Dec. 31, 2017

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, 2017		December 31, 2016
Deferred sales commissions	$	41,414	$	37,459
Prepaid software maintenance and subscriptions	18,130		18,627
Taxes, prepaid and receivable	10,548		4,111
Prepaid insurance	1,310		308
Deferred professional services costs	681		1,722
Prepaid royalties	500		1,373
Deferred tax asset	451		2,379
Other assets	7,148		4,859
Total prepaid expenses and other assets	80,182		70,838
Less: Long-term portion	24,083		22,524
Prepaid expenses and other current assets	$	56,099	$	48,314

Accrued expenses and other liabilities



(dollars in thousands)	December 31, 2017		December 31, 2016
Accrued bonuses	$	16,743	$	17,468
Accrued commissions and salaries	6,943		8,832
Taxes payable	5,517		5,721
Deferred rent liabilities	4,548		4,110
Lease incentive obligations	4,635		5,604
Unrecognized tax benefit	1,972		3,295
Customer credit balances	4,652		5,148
Accrued subscriptions	1,221		2,840
Accrued vacation costs	2,458		2,214
Accrued health care costs	2,615		1,495
Other liabilities	8,727		6,002
Total accrued expenses and other liabilities	60,031		62,729
Less: Long-term portion	5,632		8,533
Accrued expenses and other current liabilities	$	54,399	$	54,196

Deferred revenue



(dollars in thousands)	December 31, 2017		December 31, 2016
Subscriptions	$	185,042	$	144,606
Maintenance	63,246		76,803
Services and other	31,811		29,531
Total deferred revenue	280,099		250,940
Less: Long-term portion	3,643		6,440
Deferred revenue, current portion	$	276,456	$	244,500

Other income (expense), net



	Years ended December 31,
(dollars in thousands)	2017			2016			2015
Interest income	$	993		$	581		$	155
Loss on sale of business	—			—			(1,976		)
Gain on derivative instrument	462			—			—
Loss on debt extinguishment	(299		)	—			—
Other income (expense), net	1,104			(872		)	134
Other income (expense), net	$	2,260		$	(291	)	$	(1,687	)

Debt

12 Months Ended

Dec. 31, 2017

Debt 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, 2017		December 31, 2016		December 31, 2017		December 31, 2016
Credit facility:
Revolving credit loans	$	143,000	$	180,900	2.84	%	2.36	%
Term loans	296,250		162,969		2.64	%	2.62	%
Other debt	1,076		—		4.50	%	—	%
Total debt	440,326		343,869		2.71	%	2.48	%
Less: Unamortized discount and debt issuance costs	2,102		1,476
Less: Debt, current portion	8,576		4,375		3.03	%	2.50	%
Debt, net of current portion	$	429,648	$	338,018	2.71	%	2.48	%

Financing for 2017 acquisitions

On April 3, 2017 we acquired AcademicWorks for $52.1 million in cash, net of closing adjustments. We financed the acquisition with a revolving credit loan under the 2014 Credit Facility (defined below). On October 2, 2017, we borrowed $138.7 million pursuant to a revolving credit loan under the 2017 Credit Facility (defined below) to finance our acquisition of JustGiving.

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.

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, 2017, deferred financing costs totaling $1.2 million were included in other assets on our consolidated balance sheets. As of December 31, 2016, deferred financing costs included in other assets on our consolidated balance sheets were insignificant. 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, 2017, 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, 2017, 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, 2017, our available borrowing capacity under the 2017 Credit Facility was $254.2 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 is a non-interest-bearing note requiring annual payments, where the first payment was due in November 2017. Interest associated with the note is imputed at the rate we would incur for amounts borrowed under the 2017 Credit Facility.

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



Years ending December 31, (dollars in thousands)	Annual maturities
2018	$	8,576
2019	7,500
2020	7,500
2021	7,500
2022	409,250
Thereafter	—
Total required maturities	$	440,326

Derivative Instruments

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives Instruments

10. Derivative Instruments

Cash flow hedges

We generally use derivative instruments to manage our variable interest rate risk. In March 2014, we entered into a new interest rate swap agreement (the "March 2014 Swap Agreement"), which effectively converts portions of our variable rate debt under our credit facility to a fixed rate for the term of the March 2014 Swap Agreement. The initial notional value of the March 2014 Swap Agreement was $125.0 million with an effective date beginning in March 2014. In March 2017, the notional value of the March 2014 Swap Agreement decreased to $75.0 million for the remaining term through February 2018. We designated the March 2014 Swap Agreement as a cash flow hedge at the inception of the contract.

In October 2015, we entered into an additional interest rate swap agreement (the "October 2015 Swap Agreement"), which effectively converts portions of our variable rate debt under our credit facility to a fixed rate for the term of the October 2015 Swap Agreement. The notional value of the October 2015 Swap Agreement was $75.0 million with an effective date beginning in October 2015 and maturing in February 2018. We designated the October 2015 Swap Agreement as a cash flow hedge at the inception of the contract.

In July 2017, we entered into an additional 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.

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, 2017		December 31, 2016		Balance sheet location	December 31, 2017		December 31, 2016
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	1,138		206		Other liabilities	—		163
Total derivative instruments designated as hedging instruments		$	1,283	$	206		$	—	$	163

We did not have any undesignated derivative instruments as of December 31, 2017 and 2016.

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, 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	)

	December 31, 2015				Year ended December 31, 2015
Interest rate swaps	$	(31	)	Interest expense	$	(1,569	)

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, 2017 that is expected to be reclassified into earnings within the next twelve months is insignificant. There were no ineffective portions of our interest rate swap derivatives during the years ended December 31, 2017, 2016 and 2015. 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 2016 and 2015. 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, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

11. Commitments and Contingencies

Historical Leases

We lease our headquarters facility under a 15-year lease agreement which was entered into in October 2008, 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 terminates on September 30, 2023, and has two five-year renewal options. The current annual base rent of the lease is $2.8 million. The base rent escalates annually between 2% and 4% based on the terms of the agreement. The rent expense is recorded on a straight-line basis over the length of the lease term. At December 31, 2017, we had a standby letter of credit of $1.5 million for a security deposit for this lease.

We have provisions in our leases that entitle us to aggregate remaining leasehold improvement allowances of $5.7 million as of December 31, 2017. 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, 2017, our total minimum rentals to be received in the future under noncancelable subleases was $6.5 million. These amounts are also being recorded as a reduction to rent expense.

Total rent expense was $16.1 million, $11.7 million and $10.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The quarterly South Carolina state incentive payments we received as a result of locating our current 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 and $2.3 million for the years ended December 31, 2016 and 2015, respectively.

Lease for New Headquarters Facility

In May 2016, we entered into a lease agreement for a new headquarters facility to be built in Charleston, South Carolina (the "New Headquarters Facility"). The landlord is responsible for the design, development and construction of the New Headquarters Facility. Construction of the New Headquarters Facility will proceed in two phases. Phase One will include a building with approximately 172,000 rentable square feet, which is expected to be completed in the first half of 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. Total rent payments and leasehold improvement allowances for Phase One are estimated to be approximately $104.2 million and $13.9 million, respectively, over the life of the lease agreement, plus additional amounts for Phase Two, if applicable. The lease agreement is for a period of twenty years beginning on the date of substantial completion of construction by the landlord, which is estimated to be in the first half of 2018, and ending in the first half of 2038. The lease agreement provides for four renewal periods of five years each at a base rent equal to the then prevailing market rate for comparable buildings. 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, 2017, 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⁾
2018	$	18,373
2019	17,273
2020	15,407
2021	14,697
2022	14,696
Thereafter	82,789
Total minimum lease payments	$	163,235


(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, 2017.

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, 2017, the remaining aggregate minimum purchase commitment under these arrangements was approximately $66.8 million through 2021.

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 contingencies

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, 2017, 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, 2017

Income Tax Disclosure [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 and Ireland. We are generally subject to U.S. federal income tax examination for calendar tax years 2014 through 2017 as well as state and foreign income tax examinations for various years depending on statutes of limitations of those jurisdictions.

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code, including, but not limited to, (1) reducing the U.S. federal corporate tax rate from 35% to 21%, effective January 1, 2018; (2) requiring companies to pay a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries (the "Transition Tax"); (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) requiring a current inclusion in U.S. federal taxable income of certain earnings of controlled foreign corporations; (5) eliminating the corporate alternative minimum tax (AMT) and changing how existing AMT credits can be realized; (6) creating the base erosion anti-abuse tax (BEAT), a new minimum tax; (7) creating a new limitation on deductible interest expense; and (8) changing rules related to uses and limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017.

Under GAAP, we use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Due to the reduction in the federal corporate tax rate from 35% to 21%, we revalued our net deferred tax assets and deferred tax liabilities and recorded a discrete tax benefit to expense of $20.0 million in 2017.

The Transition Tax is a tax on previously untaxed accumulated and current earnings and profits of certain of our foreign subsidiaries. We were able to make a reasonable estimate of the Transition Tax and determined that it was insignificant.

The Tax Act eliminates the exceptions for performance-based compensation and CFO compensation from the 162(m) calculation. A transition rule allows for the grandfathering of performance-based compensation pursuant to a written binding contract in effect as of November 2, 2017. While there is negative discretion inherent in our performance-based compensation plans, it is our position that the intent is for historic contracts to be written and binding. As a result, we have not adjusted the ending deferred tax asset for the performance-based stock compensation or the bonus accrual in our 2017 tax provision.

The Tax Act includes a new provision, referred to as Global Intangible Low-Taxed Income (“GILTI”), which provides for a 10.5% tax on certain income of controlled foreign corporations. We have elected to account for GILTI as a period cost if and when occurred, rather than recognizing deferred taxes for basis differences expected to reverse. As a result of this policy election, there is no impact to our 2017 deferred tax calculation.

Our estimates of the impact of the Tax Act may change due to a number of additional considerations including, but not limited to, the issuance of additional regulations or guidance and our ongoing analysis of the new law. Any subsequent adjustment to these amounts will be recorded to tax expense in 2018 when the analysis is complete.

The following summarizes the components of income tax expense:



	Years ended December 31,
(dollars in thousands)	2017			2016		2015
Current taxes:
U.S. Federal	$	2,632		$	4,655	$	5,890
U.S. State and local	(144		)	1,670		2,215
International	101			53		33
Total current taxes	2,589			6,378		8,138
Deferred taxes:
U.S. Federal	(13,843		)	2,544		2,702
U.S. State and local	398			304		585
International	(883		)	185		(122		)
Total deferred taxes	(14,328		)	3,033		3,165
Total income tax provision	$	(11,739	)	$	9,411	$	11,303

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



	Years ended December 31,
(dollars in thousands)	2017			2016		2015
U.S.	$	54,634		$	49,320	$	37,523
International	(440		)	1,606		(571		)
Income before provision for income taxes	$	54,194		$	50,926	$	36,952

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,
	2017		2016		2015
Federal statutory rate	35.0	%	35.0	%	35.0	%
Effect of:
State income taxes, net of federal benefit	1.6		4.1		5.7
Change in federal income tax rate applied to deferred tax balances	(36.9	)	—		—
Change in state income tax rate applied to deferred tax balances	—		0.2		2.1
Fixed assets	—		—		(0.1	)
Unrecognized tax benefit	1.6		0.2		(1.1	)
State credits, net of federal benefit	(1.5	)	(0.1	)	6.0
Change in valuation reserve (primarily state credit reserves)	(1.1	)	(1.6	)	(8.6	)
Federal credits generated	(6.2	)	(6.2	)	(6.1	)
Foreign tax rate	0.2		(0.4	)	(0.7	)
Acquisition costs	2.4		0.1		0.1
Section 162(m) limitation	2.7		1.7		0.1
Loss from sale of foreign subsidiary	—		—		1.9
Domestic production activities deduction	—		(1.2	)	(1.8	)
Stock-based compensation	(20.3	)	(13.6	)	—
Other	0.8		0.3		(1.9	)
Income tax provision effective rate	(21.7	)%	18.5	%	30.6	%

As discussed above, due to the reduction in the federal corporate tax rate from 35% to 21%, we revalued our net deferred tax assets and deferred tax liabilities as of December 31, 2017, and recorded a discrete tax benefit to expense of $20.0 million in 2017.

The discrete tax benefit to expense relating to stock-based compensation items was $12.5 million in 2017. We recorded a discrete tax benefit to expense relating to stock-based compensation of $7.7 million during the year ended December 31, 2016. Prior to the adoption of ASU 2016-09 in 2016, we recorded excess tax benefit from the exercise and vesting of stock-based compensation of $5.5 million in additional paid in capital during the year ended December 31, 2015.

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



	December 31,
(dollars in thousands)	2017			2016
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$	13,597		$	12,906
Federal, state and foreign tax credits	14,389			9,924
Intangible assets	693			652
Stock-based compensation	9,611			11,480
Accrued bonuses	1,001			7,426
Deferred revenue	859			5,371
Allowance for doubtful accounts	1,379			1,294
Other	5,440			6,781
Total deferred tax assets	46,969			55,834
Deferred tax liabilities relating to:
Intangible assets	(47,997		)	(44,885		)
Fixed assets	(4,552		)	(9,200		)
Deferred sales commissions	(9,354		)	(6,347		)
Capitalized software development costs	(14,012		)	(14,832		)
Other	(995		)	(755		)
Total deferred tax liabilities	(76,910		)	(76,019		)
Valuation allowance	(7,205		)	(6,994		)
Net deferred tax liability	$	(37,146	)	$	(27,179	)

As of December 31, 2017, our federal, foreign and state net operating loss carryforwards for income tax purposes were approximately $33.5 million, $31.2 million and $36.9 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 2018. Our foreign net operating loss carryforwards have an unlimited carryforward period. As of December 31, 2017, our foreign tax credit carryforwards for income tax purposes were insignificant. Our federal tax credit carryforwards for income tax purposes were approximately $3.6 million. Our state tax credit carryforwards for income tax purposes were approximately $13.5 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 2018. 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		Charges to expense			Balance at end of year
(dollars in thousands)
2017	$	6,994	$	211		$	7,205
2016	7,911		(917		)	6,994
2015	11,161		(3,250		)	7,911

The following table sets forth the change to our unrecognized tax benefit for the years ended December 31, 2017, 2016 and 2015:



	Years ended December 31,
(dollars in thousands)	2017			2016			2015
Balance at December 31, 2016	$	3,145		$	3,024		$	3,564
Increases from prior period positions	1,860			23			129
Decreases in prior year positions	(238		)	(17		)	(651		)
Increases from current period positions	404			358			257
Settlements (payments)	—			—			(274		)
Lapse of statute of limitations	(11		)	(243		)	(1		)
Balance at December 31, 2017	$	5,160		$	3,145		$	3,024

The total amount of unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate was $4.6 million at December 31, 2017. 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, 2017 was $0.8 million. The total amount of accrued interest and penalties included in the consolidated balance sheet as of December 31, 2016 was insignificant. 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 2017, 2016 and 2015 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, 2017 was $1.6 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, 2017

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

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 Kintera in July 2008, we maintain the Kintera, Inc. Amended and Restated 2003 Equity Incentive Plan, as amended (the “Kintera 2003 Plan”), which we assumed upon the acquisition of Kintera. 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 5,558,809 as of December 31, 2017. 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	2017	2016
Restricted stock awards	1,257,574	1,178,592
Restricted stock units	493,248	465,395
Stock appreciation rights	212,506	469,075
Stock options	2,050	3,502

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)	2017		2016		2015
Included in cost of revenue:
Cost of subscriptions	$	1,254	$	1,168	$	1,130
Cost of maintenance	373		508		420
Cost of services and other	1,843		1,621		1,944
Total included in cost of revenue	3,470		3,297		3,494
Included in operating expenses:
Sales, marketing and customer success	6,381		3,844		2,979
Research and development	7,765		6,467		4,865
General and administrative	23,015		19,030		13,908
Total included in operating expenses	37,161		29,341		21,752
Total stock-based compensation expense	$	40,631	$	32,638	$	25,246

The total amount of compensation cost related to unvested awards not recognized was $65.3 million at December 31, 2017. 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, 2017, 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, 2017	1,178,592		$	49.49
Granted	570,208		74.08
Vested	(410,087	)	47.28
Forfeited	(81,139	)	55.35
Unvested at December 31, 2017	1,257,574		61.00		8.2	$	118,828


(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, 2017, 2016 and 2015 was $19.4 million, $14.5 million and $10.6 million, respectively. The weighted average grant-date fair value of restricted stock awards granted during the years ended December 31, 2016 and 2015 was $53.59 and $48.82, 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, 2017, 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, 2017	465,395		$	47.51
Granted	247,471		72.19
Forfeited	(8,157	)	51.75
Vested	(211,461	)	44.65
Unvested at December 31, 2017	493,248		61.05		8.3	$	46,607


(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, 2017, 2016 and 2015 was $9.4 million, $6.7 million, and $3.9 million, respectively. The weighted average grant date fair value of restricted stock units granted for the years ended December 31, 2016 and 2015 was $51.98 and $45.15, 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, 2017, 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, 2017	469,075		$	23.63
Exercised	(256,569	)	24.14
Outstanding at December 31, 2017	212,506		23.01		1.8	$	15,191
Vested and exercisable at December 31, 2017	212,506		23.01		1.8	15,191


(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. The total intrinsic value of SARs exercised during the years ended December 31, 2017, 2016 and 2015 was $14.2 million, $10.7 million, and $5.2 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 years ended December 31, 2016 and 2015 was $1.0 million, and $1.9 million, respectively. 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, 2017, 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, 2017	3,502		$	11.25
Exercised	(1,400	)	10.99
Expired	(52	)	10.59
Outstanding at December 31, 2017	2,050		11.44		0.9	$	170
Vested and exercisable at December 31, 2017	2,050		11.44		0.9	170


(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. The total intrinsic value of stock options exercised during the years ended December 31, 2017, 2016 and 2015 was insignificant. The total fair value of stock options that vested during the years ended December 31, 2017, 2016 and 2015 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, 2017

Equity [Abstract]

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, 2017.



Declaration Date	Dividend per Share		Record Date	Payable Date
February 8, 2017	$	0.12	February 28	March 15
May 1, 2017	0.12		May 26	June 15
July 31, 2017	0.12		August 28	September 15
October 25, 2017	0.12		November 28	December 15

On February 6, 2018, our Board of Directors declared a first quarter dividend of $0.12 per share payable on March 15, 2018 to stockholders of record on February 28, 2018.

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, 2017.

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)	2017			2016			2015
Accumulated other comprehensive loss, beginning of period	$	(457	)	$	(825	)	$	(1,032	)
By component:
Gains and losses on cash flow hedges:
Accumulated other comprehensive (loss) income balance, beginning of period	$	25		$	(19	)	$	(164	)
Other comprehensive income (loss) before reclassifications, net of tax effects of $(374), $406 and $514	574			(626		)	(818		)
Amounts reclassified from accumulated other comprehensive loss to interest expense	293			1,106			1,569
Amounts reclassified from accumulated other comprehensive loss to loss on debt extinguishment and termination of derivative instruments	—			—			—
Tax benefit included in provision for income taxes	(116		)	(436		)	(606		)
Total amounts reclassified from accumulated other comprehensive loss	177			670			963
Net current-period other comprehensive income	751			44			145
Accumulated other comprehensive income balance, end of period	$	776		$	25		$	(19	)
Foreign currency translation adjustment:
Accumulated other comprehensive loss balance, beginning of period	$	(482	)	$	(806	)	$	(868	)
Translation adjustments	(943		)	324			62
Accumulated other comprehensive loss balance, end of period	(1,425		)	(482		)	(806		)
Accumulated other comprehensive loss, end of period	$	(649	)	$	(457	)	$	(825	)

Defined Contribution Plan

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Defined Contribution Plan

15. Defined Contribution Plan

We have a defined contribution plan 401(k) (the "401K Plan") covering substantially all employees. Employees were able to contribute between 1% and 75% of their salaries in 2017 and 2016 and between 1% and 30% of their salaries in 2015. 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, 2017, 2016 and 2015 were $7.1 million, $7.6 million and $5.3 million, respectively. There were no discretionary contributions by us to the 401K Plan in 2017, 2016 and 2015.

Segment Information

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segment Information

16. Segment Information

As discussed in Note 2 of these consolidated financial statements, our chief operating decision maker is 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.



(dollars in thousands)	United States		Other Countries		Total
Property and equipment:
December 31, 2017	$	39,071	$	3,172	$	42,243
December 31, 2016	47,663		2,606		50,269

Disaggregation of Revenue

12 Months Ended

Dec. 31, 2017

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

17. Disaggregation of Revenue

We generate a portion of our revenue from operations outside of the United States. The following table presents revenue by geographic region based on country of invoice origin.



(dollars in thousands)	United States		Other Countries		Total
Revenue by geography:
2017	$	706,798	$	81,508	$	788,306
2016	660,339		70,476		730,815
2015	570,519		67,421		637,940

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:


•	The GMG focuses on sales to all K-12 private schools, faith-based 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.

The following table presents our revenue by market group:



(dollars in thousands)	GMG		EMG		IMG		Other		Total
Revenue by market group:
2017	$	406,954	$	330,930	$	48,429	$	1,993	$	788,306
2016	383,319		302,968		42,539		1,989		730,815
2015	313,935		279,897		41,997		2,111		637,940

Quarterly Results (unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results

18. Quarterly Results (Unaudited)



(dollars in thousands, except per share data)	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
Total revenue	$	216,977	$	195,513	$	192,195	$	183,621
Gross profit	114,555		108,508		105,200		98,139
Income from operations	18,739		17,965		16,748		10,579
Income before provision for income taxes	16,006		15,341		14,359		8,488
Net income	30,709		12,548		11,165		11,511
Earnings per share
Basic	$	0.66	$	0.27	$	0.24	$	0.25
Diluted	0.64		0.26		0.23		0.24

(dollars in thousands, except per share data)	December 31, 2016		September 30, 2016		June 30, 2016		March 31, 2016
Total revenue	$	198,305	$	183,063	$	180,191	$	169,256
Gross profit	105,903		99,746		96,579		89,367
Income from operations	24,024		13,540		13,624		10,612
Income before provision for income taxes	21,372		10,884		10,838		7,832
Net income	17,284		8,934		9,060		6,237
Earnings per share
Basic	$	0.37	$	0.19	$	0.20	$	0.14
Diluted	0.36		0.19		0.19		0.13

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.

Disposition of Business

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Disposition of Business

19. Disposition of Business

On May 18, 2015, we completed the sale of RLC Customer Technology B.V. ("RLC"), a formerly wholly-owned entity based in the Netherlands, to a private software company by selling all of the issued and outstanding stock of RLC in exchange for $0.4 million in gross cash proceeds. We incurred an insignificant amount of legal costs associated with the disposition of this business. As part of the disposition, we derecognized $1.4 million of goodwill related to RLC. As a result of this disposition, we also recognized an insignificant foreign currency translation loss in our consolidated statement of comprehensive income. Overall, this transaction, including costs associated with the disposition and the recognition of an insignificant foreign currency translation gain, resulted in a $2.0 million loss, which was recorded in other income (expense), net in our consolidated statement of comprehensive income for the year ended December 31, 2015. The disposition of RLC did not qualify for reporting as a discontinued operation since the transaction did not represent a strategic shift in our operations.

Restructuring

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Restructuring

20. Restructuring

During 2017, in an effort to improve operating efficiency and further our organizational objectives, we initiated a plan to 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. We are currently evaluating the total before-tax restructuring costs we expect to incur as a result of this plan through 2019. Restructuring costs expected to be incurred consist primarily of costs to terminate existing lease agreements. For the year ended December 31, 2017, we incurred restructuring costs of $0.8 million related to the termination of our lease for office space in Emeryville, CA.

The following table summarizes our restructuring costs as of December 31, 2017:



	Total costs incurred during the year ended		Included in accrued expenses and other liabilities at
(in thousands)	December 31, 2017		December 31, 2017
By component:
Contract termination costs	$	794	$	585
Total	$	794	$	585

Basis of Presentation (Policy)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Basis of presentation

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

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

Revenue recognition

We commence revenue recognition when all of the following conditions are met:

•Persuasive evidence of an arrangement exists;

•The solutions or services have been or are being provided to the customer;

•The fee is fixed or determinable; and

•Collection of the resulting receivable is probable.

Subscriptions

Maintenance

Services

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; due to customers

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

Concentration of credit risk

Property and equipment

Business combinations

Goodwill

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⁾	8-17
Marketing assets	Straight-line	2-15
Acquired software and technology	Straight-line and accelerated⁽²⁾	5-10
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships are amortized on an accelerated basis.


(2)	Certain of the 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

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, 2017 and 2016.

Sales returns and allowance for doubtful accounts

Accounts receivable

Sales commissions

Advertising costs

We expense advertising costs as incurred

Restructuring costs

Impairment of long-lived assets

Contingencies

Earnings per share

Recently adopted accounting pronouncements



Consolidated statements of cash flows:
	Nine months ended September 30, 2017						Six months ended June 30, 2017						Three months ended March 31, 2017
(dollars in thousands)	As Reported			As Adjusted			As Reported			As Adjusted			As Reported			As Adjusted
Net cash (used in) provided by financing activities	$	(45,306	)	$	(259,550	)	$	15,286		$	(70,295	)	$	(6,776	)	$	(202,775	)
Net increase (decrease) in cash and cash equivalents and restricted cash	148			(214,528		)	366			(85,465		)	(3,030		)	(199,228		)

	Twelve months ended December 31, 2016						Nine months ended September 30, 2016						Twelve months ended December 31, 2015
(dollars in thousands)	As Reported			As Adjusted			As Reported			As Adjusted			As Reported			As Adjusted
Net cash used in investing activities	$	(47,430	)	$	(47,430	)	$	(37,914	)	$	(37,914	)	$	(222,707	)	$	(141,355	)
Net cash (used in) provided by financing activities	(104,546		)	(8,546		)	(61,176		)	(188,980		)	95,499			129,778
Net increase (decrease) in cash and cash equivalents and restricted cash	1,540			100,274			1,100			(124,345		)	627			114,955

Recently issued accounting pronouncements

Legal contingencies

Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

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⁾	8-17
Marketing assets	Straight-line	2-15
Acquired software and technology	Straight-line and accelerated⁽²⁾	5-10
Non-compete agreements	Straight-line	1-5
Database	Straight-line	8


(1)	Certain of the customer relationships are amortized on an accelerated basis.


(2)	Certain of the 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
2017	$	2,704	$	10,511	$	(8,815	)	$	4,400
2016	4,431		3,060		(4,787		)	2,704
2015	4,185		5,834		(5,588		)	4,431

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
2017	$	587	$	1,148	$	(994	)	$	741
2016	512		499		(424		)	587
2015	354		699		(541		)	512

Schedule of Changes in Deferred Sales Commission Costs

Below is a summary of the changes in our deferred sales commission costs included in prepaid expenses and other current assets.



Years ended December 31, (in thousands)	Balance at beginning of year		Additions		Expense			Balance at end of year
2017	$	37,459	$	35,420	$	(31,465	)	$	41,414
2016	30,141		37,553		(30,235		)	37,459
2015	22,630		55,934		(48,423		)	30,141

Adoption of New Standard Impact on Previously Reported Quarterly Results

The effects of those adjustments have been provided in summarized format below.



Consolidated statements of cash flows:
	Nine months ended September 30, 2017						Six months ended June 30, 2017						Three months ended March 31, 2017
(dollars in thousands)	As Reported			As Adjusted			As Reported			As Adjusted			As Reported			As Adjusted
Net cash (used in) provided by financing activities	$	(45,306	)	$	(259,550	)	$	15,286		$	(70,295	)	$	(6,776	)	$	(202,775	)
Net increase (decrease) in cash and cash equivalents and restricted cash	148			(214,528		)	366			(85,465		)	(3,030		)	(199,228		)

	Twelve months ended December 31, 2016						Nine months ended September 30, 2016						Twelve months ended December 31, 2015
(dollars in thousands)	As Reported			As Adjusted			As Reported			As Adjusted			As Reported			As Adjusted
Net cash used in investing activities	$	(47,430	)	$	(47,430	)	$	(37,914	)	$	(37,914	)	$	(222,707	)	$	(141,355	)
Net cash (used in) provided by financing activities	(104,546		)	(8,546		)	(61,176		)	(188,980		)	95,499			129,778
Net increase (decrease) in cash and cash equivalents and restricted cash	1,540			100,274			1,100			(124,345		)	627			114,955

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2017

JustGiving [Member]

Business Acquisition [Line Items]

Purchase Price Allocation



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	10,496
Finite-lived intangible assets	73,184
Other long-term assets	4,314
Deferred tax liability	(7,549		)
Deferred revenue	(245		)
Other long-term liabilities	(332		)
Goodwill	57,341
Total purchase price	$	137,209

Acquired Intangible Assets

The JustGiving acquisition resulted in the identification of the following identifiable finite-lived intangible assets:



	Intangible assets acquired		Weighted average amortization period
AcademicWorks	(in thousands)		(in years)
Marketing assets	$	32,000	15
Acquired technology	21,000		10
Customer relationships	20,000		15
Non-compete agreements	184		1
Total intangible assets	$	73,184	14

AcademicWorks [Member]

Business Acquisition [Line Items]

Purchase Price Allocation



(in thousands)	Purchase price allocation
Net working capital, excluding deferred revenue	$	2,949
Property and equipment	290
Finite-lived intangible assets	30,900
Deferred revenue	(3,950		)
Deferred tax liability	(12,350		)
Goodwill	34,305
Total purchase price	$	52,144

Acquired Intangible Assets

The AcademicWorks acquisition resulted in the identification of the following identifiable finite-lived intangible assets:



	Intangible assets acquired		Weighted average amortization period
AcademicWorks	(in thousands)		(in years)
Acquired technology	$	22,500	9
Customer relationships	8,000		15
Marketing assets	320		2
Non-compete agreements	80		3
Total intangible assets	$	30,900	10

Smart Tuition [Member]

Business Acquisition [Line Items]

Pro Forma Financial Information



	Years ended December 31,
(dollars in thousands, except per share amounts)	2015
Revenue	$	666,131
Net income	$	26,334
Basic earnings per share	$	0.58
Diluted earnings per share	$	0.57

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

The change in our goodwill during 2017 consisted of the following:



(dollars in thousands)	Total
Balance at December 31, 2016	$	438,240
Additions related to current year business combinations	91,646
Adjustments related to prior year business combination	(87		)
Effect of foreign currency translation	450
Balance at December 31, 2017	$	530,249

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)	2017			2016
Finite-lived gross carrying amount
Customer relationships	$	274,458		$	248,287
Marketing assets	49,661			16,187
Acquired software and technology	193,010			147,269
Non-compete agreements	2,603			3,493
Database	4,275			4,275
Total finite-lived gross carrying amount	524,007			419,511
Accumulated amortization
Customer relationships	(96,662		)	(77,983		)
Marketing assets	(12,444		)	(9,826		)
Acquired software and technology	(96,528		)	(74,975		)
Non-compete agreements	(1,125		)	(1,553		)
Database	(4,197		)	(4,093		)
Total accumulated amortization	(210,956		)	(168,430		)
Indefinite-lived gross carrying amount
Marketing assets	1,600			2,595
Intangible assets, net	$	314,651		$	253,676

Summary of Amortization Expense

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



	Years ended December 31,
(dollars in thousands)	2017		2016		2015
Included in cost of revenue:
Cost of subscriptions	$	32,399	$	31,270	$	23,075
Cost of maintenance	5,158		5,327		4,162
Cost of services and other	2,542		2,961		2,750
Total included in cost of revenue	40,099		39,558		29,987
Included in operating expenses	3,271		2,840		2,231
Total amortization of intangibles from business combinations	$	43,370	$	42,398	$	32,218

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, 2017:



Years ending December 31, (dollars in thousands)	Amortization expense
2018	$	46,044
2019	43,596
2020	35,132
2021	29,322
2022	25,540
Total	$	179,634

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

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)	2017		2016		2015
Numerator:
Net income	$	65,933	$	41,515	$	25,649
Denominator:
Weighted average common shares	46,669,440		46,132,389		45,623,854
Add effect of dilutive securities:
Stock-based awards	1,106,262		1,184,149		874,850
Weighted average common shares assuming dilution	47,775,702		47,316,538		46,498,704
Earnings per share:
Basic	$	1.41	$	0.90	$	0.56
Diluted	$	1.38	$	0.88	$	0.55

Anti-dilutive shares excluded from calculations of diluted earnings per share	4,634		7,339		18,554

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and liabilities 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, 2017
Financial assets:
Derivative instruments	$	—	$	1,283	$	—	$	1,283
Total financial assets	$	—	$	1,283	$	—	$	1,283

Fair value as of December 31, 2016
Financial assets:
Derivative instruments	$	—	$	206	$	—	$	206
Total financial assets	$	—	$	206	$	—	$	206

Fair value as of December 31, 2016
Financial liabilities:
Derivative instruments	$	—	$	163	$	—	$	163
Total financial liabilities	$	—	$	163	$	—	$	163

Property and Equipment and Software Development Costs (Tables)

12 Months Ended

Dec. 31, 2017

Property and equipment [Member]

Property, Plant and Equipment [Line Items]

Schedule of 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)	2017			2016
Equipment	2 - 5	$	2,728		$	2,403
Computer hardware	2 - 5	76,331			81,260
Computer software	2 - 5	34,058			31,604
Construction in progress	—	3,102			2,972
Furniture and fixtures	3 - 10	7,265			7,989
Leasehold improvements	Lesser of lease term or 10 years	22,359			19,942
Total property and equipment		145,843			146,170
Less: accumulated depreciation		(103,600		)	(95,901		)
Property and equipment, net		$	42,243		$	50,269

Software development [Member]

Property, Plant and Equipment [Line Items]

Schedule of Property and Equipment

Software development costs consisted of the following, as of:



	Estimated useful life (years)	December 31,
(dollars in thousands)	Estimated useful life (years)	2017			2016
Software development costs	3 - 7	$	84,404		$	55,126
Less: accumulated amortization		(30,306		)	(17,544		)
Software development costs, net		$	54,098		$	37,582

Consolidated Financial Statement Details (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Components of Prepaid Expenses and Other Assets

Prepaid expenses and other assets



(dollars in thousands)	December 31, 2017		December 31, 2016
Deferred sales commissions	$	41,414	$	37,459
Prepaid software maintenance and subscriptions	18,130		18,627
Taxes, prepaid and receivable	10,548		4,111
Prepaid insurance	1,310		308
Deferred professional services costs	681		1,722
Prepaid royalties	500		1,373
Deferred tax asset	451		2,379
Other assets	7,148		4,859
Total prepaid expenses and other assets	80,182		70,838
Less: Long-term portion	24,083		22,524
Prepaid expenses and other current assets	$	56,099	$	48,314

Components of Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities



(dollars in thousands)	December 31, 2017		December 31, 2016
Accrued bonuses	$	16,743	$	17,468
Accrued commissions and salaries	6,943		8,832
Taxes payable	5,517		5,721
Deferred rent liabilities	4,548		4,110
Lease incentive obligations	4,635		5,604
Unrecognized tax benefit	1,972		3,295
Customer credit balances	4,652		5,148
Accrued subscriptions	1,221		2,840
Accrued vacation costs	2,458		2,214
Accrued health care costs	2,615		1,495
Other liabilities	8,727		6,002
Total accrued expenses and other liabilities	60,031		62,729
Less: Long-term portion	5,632		8,533
Accrued expenses and other current liabilities	$	54,399	$	54,196

Components of Deferred Revenue

Deferred revenue



(dollars in thousands)	December 31, 2017		December 31, 2016
Subscriptions	$	185,042	$	144,606
Maintenance	63,246		76,803
Services and other	31,811		29,531
Total deferred revenue	280,099		250,940
Less: Long-term portion	3,643		6,440
Deferred revenue, current portion	$	276,456	$	244,500

Components of Other Income and Expense

Other income (expense), net



	Years ended December 31,
(dollars in thousands)	2017			2016			2015
Interest income	$	993		$	581		$	155
Loss on sale of business	—			—			(1,976		)
Gain on derivative instrument	462			—			—
Loss on debt extinguishment	(299		)	—			—
Other income (expense), net	1,104			(872		)	134
Other income (expense), net	$	2,260		$	(291	)	$	(1,687	)

Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

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, 2017		December 31, 2016		December 31, 2017		December 31, 2016
Credit facility:
Revolving credit loans	$	143,000	$	180,900	2.84	%	2.36	%
Term loans	296,250		162,969		2.64	%	2.62	%
Other debt	1,076		—		4.50	%	—	%
Total debt	440,326		343,869		2.71	%	2.48	%
Less: Unamortized discount and debt issuance costs	2,102		1,476
Less: Debt, current portion	8,576		4,375		3.03	%	2.50	%
Debt, net of current portion	$	429,648	$	338,018	2.71	%	2.48	%

Annual Maturities Related to Credit Facility and Other Debt

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



Years ending December 31, (dollars in thousands)	Annual maturities
2018	$	8,576
2019	7,500
2020	7,500
2021	7,500
2022	409,250
Thereafter	—
Total required maturities	$	440,326

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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, 2017		December 31, 2016		Balance sheet location	December 31, 2017		December 31, 2016
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	1,138		206		Other liabilities	—		163
Total derivative instruments designated as hedging instruments		$	1,283	$	206		$	—	$	163

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, 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	)

	December 31, 2015				Year ended December 31, 2015
Interest rate swaps	$	(31	)	Interest expense	$	(1,569	)

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, 2017

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⁾
2018	$	18,373
2019	17,273
2020	15,407
2021	14,697
2022	14,696
Thereafter	82,789
Total minimum lease payments	$	163,235


(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, 2017.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense

The following summarizes the components of income tax expense:



	Years ended December 31,
(dollars in thousands)	2017			2016		2015
Current taxes:
U.S. Federal	$	2,632		$	4,655	$	5,890
U.S. State and local	(144		)	1,670		2,215
International	101			53		33
Total current taxes	2,589			6,378		8,138
Deferred taxes:
U.S. Federal	(13,843		)	2,544		2,702
U.S. State and local	398			304		585
International	(883		)	185		(122		)
Total deferred taxes	(14,328		)	3,033		3,165
Total income tax provision	$	(11,739	)	$	9,411	$	11,303

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)	2017			2016		2015
U.S.	$	54,634		$	49,320	$	37,523
International	(440		)	1,606		(571		)
Income before provision for income taxes	$	54,194		$	50,926	$	36,952

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,
	2017		2016		2015
Federal statutory rate	35.0	%	35.0	%	35.0	%
Effect of:
State income taxes, net of federal benefit	1.6		4.1		5.7
Change in federal income tax rate applied to deferred tax balances	(36.9	)	—		—
Change in state income tax rate applied to deferred tax balances	—		0.2		2.1
Fixed assets	—		—		(0.1	)
Unrecognized tax benefit	1.6		0.2		(1.1	)
State credits, net of federal benefit	(1.5	)	(0.1	)	6.0
Change in valuation reserve (primarily state credit reserves)	(1.1	)	(1.6	)	(8.6	)
Federal credits generated	(6.2	)	(6.2	)	(6.1	)
Foreign tax rate	0.2		(0.4	)	(0.7	)
Acquisition costs	2.4		0.1		0.1
Section 162(m) limitation	2.7		1.7		0.1
Loss from sale of foreign subsidiary	—		—		1.9
Domestic production activities deduction	—		(1.2	)	(1.8	)
Stock-based compensation	(20.3	)	(13.6	)	—
Other	0.8		0.3		(1.9	)
Income tax provision effective rate	(21.7	)%	18.5	%	30.6	%

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)	2017			2016
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$	13,597		$	12,906
Federal, state and foreign tax credits	14,389			9,924
Intangible assets	693			652
Stock-based compensation	9,611			11,480
Accrued bonuses	1,001			7,426
Deferred revenue	859			5,371
Allowance for doubtful accounts	1,379			1,294
Other	5,440			6,781
Total deferred tax assets	46,969			55,834
Deferred tax liabilities relating to:
Intangible assets	(47,997		)	(44,885		)
Fixed assets	(4,552		)	(9,200		)
Deferred sales commissions	(9,354		)	(6,347		)
Capitalized software development costs	(14,012		)	(14,832		)
Other	(995		)	(755		)
Total deferred tax liabilities	(76,910		)	(76,019		)
Valuation allowance	(7,205		)	(6,994		)
Net deferred tax liability	$	(37,146	)	$	(27,179	)

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		Charges to expense			Balance at end of year
(dollars in thousands)
2017	$	6,994	$	211		$	7,205
2016	7,911		(917		)	6,994
2015	11,161		(3,250		)	7,911

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, 2017, 2016 and 2015:



	Years ended December 31,
(dollars in thousands)	2017			2016			2015
Balance at December 31, 2016	$	3,145		$	3,024		$	3,564
Increases from prior period positions	1,860			23			129
Decreases in prior year positions	(238		)	(17		)	(651		)
Increases from current period positions	404			358			257
Settlements (payments)	—			—			(274		)
Lapse of statute of limitations	(11		)	(243		)	(1		)
Balance at December 31, 2017	$	5,160		$	3,145		$	3,024

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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	2017	2016
Restricted stock awards	1,257,574	1,178,592
Restricted stock units	493,248	465,395
Stock appreciation rights	212,506	469,075
Stock options	2,050	3,502

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense:



	Years ended December 31,
(in thousands)	2017		2016		2015
Included in cost of revenue:
Cost of subscriptions	$	1,254	$	1,168	$	1,130
Cost of maintenance	373		508		420
Cost of services and other	1,843		1,621		1,944
Total included in cost of revenue	3,470		3,297		3,494
Included in operating expenses:
Sales, marketing and customer success	6,381		3,844		2,979
Research and development	7,765		6,467		4,865
General and administrative	23,015		19,030		13,908
Total included in operating expenses	37,161		29,341		21,752
Total stock-based compensation expense	$	40,631	$	32,638	$	25,246

Summary of Unvested Restricted Stock Awards, Activity

The following table summarizes our unvested restricted stock awards as of December 31, 2017, 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, 2017	1,178,592		$	49.49
Granted	570,208		74.08
Vested	(410,087	)	47.28
Forfeited	(81,139	)	55.35
Unvested at December 31, 2017	1,257,574		61.00		8.2	$	118,828


(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, 2017, 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, 2017	465,395		$	47.51
Granted	247,471		72.19
Forfeited	(8,157	)	51.75
Vested	(211,461	)	44.65
Unvested at December 31, 2017	493,248		61.05		8.3	$	46,607


(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, 2017, 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, 2017	469,075		$	23.63
Exercised	(256,569	)	24.14
Outstanding at December 31, 2017	212,506		23.01		1.8	$	15,191
Vested and exercisable at December 31, 2017	212,506		23.01		1.8	15,191


(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, 2017, 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, 2017	3,502		$	11.25
Exercised	(1,400	)	10.99
Expired	(52	)	10.59
Outstanding at December 31, 2017	2,050		11.44		0.9	$	170
Vested and exercisable at December 31, 2017	2,050		11.44		0.9	170


(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, 2017

Equity [Abstract]

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)	2017			2016			2015
Accumulated other comprehensive loss, beginning of period	$	(457	)	$	(825	)	$	(1,032	)
By component:
Gains and losses on cash flow hedges:
Accumulated other comprehensive (loss) income balance, beginning of period	$	25		$	(19	)	$	(164	)
Other comprehensive income (loss) before reclassifications, net of tax effects of $(374), $406 and $514	574			(626		)	(818		)
Amounts reclassified from accumulated other comprehensive loss to interest expense	293			1,106			1,569
Amounts reclassified from accumulated other comprehensive loss to loss on debt extinguishment and termination of derivative instruments	—			—			—
Tax benefit included in provision for income taxes	(116		)	(436		)	(606		)
Total amounts reclassified from accumulated other comprehensive loss	177			670			963
Net current-period other comprehensive income	751			44			145
Accumulated other comprehensive income balance, end of period	$	776		$	25		$	(19	)
Foreign currency translation adjustment:
Accumulated other comprehensive loss balance, beginning of period	$	(482	)	$	(806	)	$	(868	)
Translation adjustments	(943		)	324			62
Accumulated other comprehensive loss balance, end of period	(1,425		)	(482		)	(806		)
Accumulated other comprehensive loss, end of period	$	(649	)	$	(457	)	$	(825	)

Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Long-Lived Assets By Geographic Region

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



(dollars in thousands)	United States		Other Countries		Total
Property and equipment:
December 31, 2017	$	39,071	$	3,172	$	42,243
December 31, 2016	47,663		2,606		50,269

Disaggregation of Revenue (Tables)

12 Months Ended

Dec. 31, 2017

Revenue from Contract with Customer [Abstract]

Revenue by Geography

The following table presents revenue by geographic region based on country of invoice origin.



(dollars in thousands)	United States		Other Countries		Total
Revenue by geography:
2017	$	706,798	$	81,508	$	788,306
2016	660,339		70,476		730,815
2015	570,519		67,421		637,940

The General Markets Group ("GMG"), the Enterprise Markets Group ("EMG"), and the Internation

Revenue by Market Group

The following table presents our revenue by market group:



(dollars in thousands)	GMG		EMG		IMG		Other		Total
Revenue by market group:
2017	$	406,954	$	330,930	$	48,429	$	1,993	$	788,306
2016	383,319		302,968		42,539		1,989		730,815
2015	313,935		279,897		41,997		2,111		637,940

Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



(dollars in thousands, except per share data)	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
Total revenue	$	216,977	$	195,513	$	192,195	$	183,621
Gross profit	114,555		108,508		105,200		98,139
Income from operations	18,739		17,965		16,748		10,579
Income before provision for income taxes	16,006		15,341		14,359		8,488
Net income	30,709		12,548		11,165		11,511
Earnings per share
Basic	$	0.66	$	0.27	$	0.24	$	0.25
Diluted	0.64		0.26		0.23		0.24

(dollars in thousands, except per share data)	December 31, 2016		September 30, 2016		June 30, 2016		March 31, 2016
Total revenue	$	198,305	$	183,063	$	180,191	$	169,256
Gross profit	105,903		99,746		96,579		89,367
Income from operations	24,024		13,540		13,624		10,612
Income before provision for income taxes	21,372		10,884		10,838		7,832
Net income	17,284		8,934		9,060		6,237
Earnings per share
Basic	$	0.37	$	0.19	$	0.20	$	0.14
Diluted	0.36		0.19		0.19		0.13

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

Restructuring (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Costs

The following table summarizes our restructuring costs as of December 31, 2017:



	Total costs incurred during the year ended		Included in accrued expenses and other liabilities at
(in thousands)	December 31, 2017		December 31, 2017
By component:
Contract termination costs	$	794	$	585
Total	$	794	$	585

Schedule of Restructuring Reserve by Type of Cost

The following table summarizes our restructuring costs as of December 31, 2017:



	Total costs incurred during the year ended		Included in accrued expenses and other liabilities at
(in thousands)	December 31, 2017		December 31, 2017
By component:
Contract termination costs	$	794	$	585
Total	$	794	$	585

Organization (Details)	Dec. 31, 2017 Customers
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Approximate number of customers distributed across verticals	40,000

Basis of Presentation (Details) - USD ($) $ in Thousands	12 Months Ended
Basis of Presentation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jan. 01, 2016
Basis of Presentation [Line Items]
Prior period adjustment to restricted cash due to customers	$ 610,344	$ 353,771
Advertising costs	2,400	2,300	$ 2,300
Discrete tax benefit, stock-based compensation	$ 12,500
Period to exceed for customary payment terms (days)	90 days
Contract term of the maintenance services (years)	1 year
Contract term of fixed-rate programs (years)	1 year
Customary advanced billing period (years)	1 year
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 development costs	0	0	239
Impairment of long-lived assets	0	0	$ 0
Prior period adjustment to due to customers	$ 611,880	353,771
Minimum [Member]
Basis of Presentation [Line Items]
Recognition period of revenue from cloud-based solutions (years)	1 year
Recognition period of revenue from hosting services (years)	1 year
Maximum [Member]
Basis of Presentation [Line Items]
Recognition period of revenue from cloud-based solutions (years)	3 years
Recognition period of revenue from hosting services (years)	3 years
ASU 2016-09 [Member]
Basis of Presentation [Line Items]
Cumulative effect of a change in accounting principle							$ (900)
Discrete tax benefit, stock-based compensation		$ 7,700
Restatement adjustment [Member]
Basis of Presentation [Line Items]
Prior period adjustment to restricted cash due to customers				$ 21,300	$ 7,200	$ 8,500
Prior period adjustment to due to customers				$ 21,300	$ 7,200	$ 8,500
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

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

12 Months Ended

Dec. 31, 2017

Customer relationships [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, amortization method

Straight-line and accelerated(1)

^[1]

Customer relationships [Member] | Minimum [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

8 years

Customer relationships [Member] | Maximum [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

17 years

Marketing assets [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, amortization method

Straight-line

Marketing assets [Member] | Minimum [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

2 years

Marketing assets [Member] | Maximum [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

15 years

Acquired software and technology [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, amortization method

Straight-line and accelerated(2)

^[2]

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

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

5 years

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

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

10 years

Non-compete agreements [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, amortization method

Straight-line

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

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

1 year

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

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, useful life

5 years

Database [Member]

Finite-Lived Intangible Assets [Line Items]

Finite-lived intangible assets, amortization method

Straight-line

Finite-lived intangible assets, useful life

8 years

[1]	Certain of the customer relationships are amortized on an accelerated basis.
[2]	Certain of the 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, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for sales returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 2,704	$ 4,431	$ 4,185
Provision/adjustment	10,511	3,060	5,834
Write-off	(8,815)	(4,787)	(5,588)
Balance at end of year	4,400	2,704	4,431
Allowance for doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	587	512	354
Provision/adjustment	1,148	499	699
Write-off	(994)	(424)	(541)
Balance at end of year	$ 741	$ 587	$ 512

Basis of Presentation (Changes in Deferred Sales Commission Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred sales commissions [Roll Forward]
Balance at beginning of year	$ 37,459	$ 30,141	$ 22,630
Additions	35,420	37,553	55,934
Expense	(31,465)	(30,235)	(48,423)
Balance at end of year	$ 41,414	$ 37,459	$ 30,141

Basis of Presentation (Adoption of New Standard Impact on Previously Reported Quarterly Results) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated statements of cash flows:
Net cash (used in) provided by financing activities	$ (202,775)	$ (70,295)	$ (259,550)	$ (188,980)	$ 278,641	$ (8,546)	$ 129,778
Net increase (decrease) in cash and cash equivalents and restricted cash	(199,228)	(85,465)	(214,528)	(124,345)	269,501	100,274	114,955
Net cash used in investing activities				(37,914)	$ (184,880)	(47,430)	(141,355)
Scenario, previously reported [Member]
Consolidated statements of cash flows:
Net cash (used in) provided by financing activities	(6,776)	15,286	(45,306)	(61,176)		(104,546)	95,499
Net increase (decrease) in cash and cash equivalents and restricted cash	$ (3,030)	$ 366	$ 148	1,100		1,540	627
Net cash used in investing activities				$ (37,914)		$ (47,430)	$ (222,707)

Business Combinations (Details) $ in Thousands, £ in Millions							3 Months Ended								12 Months Ended
	Oct. 02, 2017 USD ($)	Oct. 02, 2017 GBP (£)	Jun. 02, 2017 USD ($)	Apr. 03, 2017 USD ($)	Jul. 11, 2016 USD ($)	Oct. 02, 2015 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill							$ 530,249				$ 438,240				$ 530,249	$ 438,240
Total revenue							216,977	$ 195,513	$ 192,195	$ 183,621	198,305	$ 183,063	$ 180,191	$ 169,256	788,306	730,815	$ 637,940
Income from operations							$ 18,739	$ 17,965	$ 16,748	$ 10,579	$ 24,024	$ 13,540	$ 13,624	$ 10,612	64,031	$ 61,800	$ 46,712
Goodwill, tax deductible amount				$ 0
JustGiving [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition	$ 137,200	£ 102.4
Business Combination, Acquisition Related Costs															4,200
Finite-lived intangible assets acquired	73,184
Goodwill	57,341
Estimated fair value of accounts receivable acquired	$ 1,700
Weighted average amortization period (in years)	14 years	14 years
AcademicWorks [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				30,900
Goodwill additions related to business combinations															91,646
Goodwill				34,305
Estimated fair value of accounts receivable acquired				$ 1,000
Weighted average amortization period (in years)				10 years
Attentive.ly [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition					$ 3,900
Goodwill, purchase accounting adjustments															$ (87)
Smart Tuition [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition						$ 187,300
Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit			$ 110,000
Revolving Credit Facility [Member] \| JustGiving [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit	$ 138,700
Revolving Credit Facility [Member] \| AcademicWorks [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition				$ 52,100
Revolving Credit Facility [Member] \| Smart Tuition [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit						$ 186,000

Business Combinations (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Oct. 02, 2017	Apr. 03, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 530,249			$ 438,240
JustGiving [Member]
Business Acquisition [Line Items]
Net working capital, excluding deferred revenue		$ 10,496
Finite-lived intangible assets		73,184
Other long-term assets		4,314
Deferred tax liability		(7,549)
Deferred revenue		(245)
Other long-term liabilities		(332)
Goodwill		57,341
Total purchase price		$ 137,209
AcademicWorks [Member]
Business Acquisition [Line Items]
Net working capital, excluding deferred revenue			$ 2,949
Finite-lived intangible assets			30,900
Deferred tax liability			(12,350)
Deferred revenue			(3,950)
Goodwill			34,305
Property and equipment			290
Total purchase price			$ 52,144

Business Combinations (Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Oct. 02, 2017	Apr. 03, 2017
JustGiving [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 73,184
Weighted average amortization period (in years)	14 years
JustGiving [Member] \| Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 20,000
Weighted average amortization period (in years)	15 years
JustGiving [Member] \| Marketing assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 32,000
Weighted average amortization period (in years)	15 years
JustGiving [Member] \| Acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 21,000
Weighted average amortization period (in years)	10 years
JustGiving [Member] \| Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 184
Weighted average amortization period (in years)	1 year
AcademicWorks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 30,900
Weighted average amortization period (in years)		10 years
AcademicWorks [Member] \| Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 8,000
Weighted average amortization period (in years)		15 years
AcademicWorks [Member] \| Marketing assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 320
Weighted average amortization period (in years)		2 years
AcademicWorks [Member] \| Acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 22,500
Weighted average amortization period (in years)		9 years
AcademicWorks [Member] \| Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 80
Weighted average amortization period (in years)		3 years

Business Combinations (Pro Forma Financial Information) (Details) - Smart Tuition [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue \| $	$ 666,131
Net income \| $	$ 26,334
Basic earnings per share \| $ / shares	$ 0.58
Diluted earnings per share \| $ / shares	$ 0.57

Goodwill and Other Intangible Assets (Change in Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2016	$ 438,240
Effect of foreign currency translation	450
Balance at December 31, 2017	$ 530,249

Goodwill And Other Intangible Assets (Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 524,007	$ 419,511
Finite-lived intangible assets, accumulated amortization	(210,956)	(168,430)
Intangible assets, net (excluding goodwill)	314,651	253,676
Marketing assets [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill), gross carrying amount	1,600	2,595
Customer relationships [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	274,458	248,287
Finite-lived intangible assets, accumulated amortization	(96,662)	(77,983)
Marketing assets [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	49,661	16,187
Finite-lived intangible assets, accumulated amortization	(12,444)	(9,826)
Acquired software and technology [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	193,010	147,269
Finite-lived intangible assets, accumulated amortization	(96,528)	(74,975)
Non-compete agreements [Member]
Schedule of Acquired Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross carrying amount	2,603	3,493
Finite-lived intangible assets, accumulated amortization	(1,125)	(1,553)
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	$ (4,197)	$ (4,093)

Goodwill and Other Intangible Assets (Summary of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	$ 43,370	$ 42,398	$ 32,218
Cost of subscriptions [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	32,399	31,270	23,075
Cost of maintenance [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	5,158	5,327	4,162
Cost of services and other [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	2,542	2,961	2,750
Total included in cost of revenue [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	40,099	39,558	29,987
Included in operating expenses [Member]
Amortization of Intangible Assets Acquired by Income Statement Location [Line Items]
Amortization	$ 3,271	$ 2,840	$ 2,231

Goodwill and Other Intangible Assets (Future Amortization Expense for Finite-Lived Intangible Assets) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Future amortization expense for finite-lived intangible assets:
2018	$ 46,044
2019	43,596
2020	35,132
2021	29,322
2022	25,540
Total	$ 179,634

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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 30,709	$ 12,548	$ 11,165	$ 11,511	$ 17,284	$ 8,934	$ 9,060	$ 6,237	$ 65,933	$ 41,515	$ 25,649
Weighted average common shares									46,669,440	46,132,389	45,623,854
Stock-based awards									1,106,262	1,184,149	874,850
Weighted average common shares assuming dilution									47,775,702	47,316,538	46,498,704
Earnings (Loss) Per Share, Basic and Diluted [Abstract]
Basic earnings per share	$ 0.66	$ 0.27	$ 0.24	$ 0.25	$ 0.37	$ 0.19	$ 0.20	$ 0.14	$ 1.41	$ 0.90	$ 0.56
Diluted earnings per share	$ 0.64	$ 0.26	$ 0.23	$ 0.24	$ 0.36	$ 0.19	$ 0.19	$ 0.13	$ 1.38	$ 0.88	$ 0.55
Shares excluded from calculations of diluted earnings per share									4,634	7,339	18,554

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, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 1,283	$ 206
Total financial assets	1,283	206
Derivative liabilities		163
Total financial liabilities		163
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	1,283	206
Total financial assets	1,283	206
Derivative liabilities		163
Total financial liabilities		163
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, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation	$ 17.8	$ 19.8	$ 18.5
Software development costs, amortization	$ 12.8	$ 8.3	$ 5.4

Property and Equipment and Software Development Costs (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 145,843	$ 146,170
Less: accumulated depreciation	(103,600)	(95,901)
Property and equipment, net	42,243	50,269
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,728	2,403
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	$ 76,331	81,260
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	$ 34,058	31,604
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	$ 3,102	2,972
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,265	7,989
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	$ 22,359	$ 19,942

Property and Equipment and Software Development Costs (Schedule of Software Development Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Software development costs, gross	$ 84,404	$ 55,126
Less: accumulated amortization	(30,306)	(17,544)
Software development costs, net	$ 54,098	$ 37,582
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	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred sales commissions	$ 41,414	$ 37,459
Prepaid software maintenance and subscriptions	18,130	18,627
Taxes, prepaid and receivable	10,548	4,111
Prepaid insurance	1,310	308
Deferred professional services costs	681	1,722
Prepaid royalties	500	1,373
Deferred tax asset	451	2,379
Other assets	7,148	4,859
Total prepaid expenses and other assets	80,182	70,838
Less: Long-term portion	24,083	22,524
Prepaid expenses and other current assets	$ 56,099	$ 48,314

Consolidated Financial Statement Details (Components of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued bonuses	$ 16,743	$ 17,468
Accrued commissions and salaries	6,943	8,832
Taxes payable	5,517	5,721
Deferred rent liabilities	4,548	4,110
Lease incentive obligations	4,635	5,604
Unrecognized tax benefit	1,972	3,295
Customer credit balances	4,652	5,148
Accrued subscriptions	1,221	2,840
Accrued vacation costs	2,458	2,214
Accrued health care costs	2,615	1,495
Other liabilities	8,727	6,002
Total accrued expenses and other liabilities	60,031	62,729
Less: Long-term portion	5,632	8,533
Accrued expenses and other current liabilities	$ 54,399	$ 54,196

Consolidated Financial Statement Details (Components of Deferred Revenue) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 280,099	$ 250,940
Less: Long-term portion	3,643	6,440
Deferred revenue, current portion	276,456	244,500
Subscriptions [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	185,042	144,606
Maintenance [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	63,246	76,803
Services and other [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 31,811	$ 29,531

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References + Details

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Consolidated Financial Statement Details (Components of Other Income and Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 993	$ 581	$ 155
Loss on sale of business	0	0	(1,976)
Gain on derivative instrument	462	0	0
Loss on debt extinguishment	(299)	0	0
Other income (expense), net	1,104	(872)	134
Other income (expense), net	$ 2,260	$ (291)	$ (1,687)

Debt (Details) $ in Thousands, £ in Millions					1 Months Ended		12 Months Ended
Debt (Details) $ in Thousands, £ in Millions	Oct. 02, 2017 USD ($)	Oct. 02, 2017 GBP (£)	Jun. 02, 2017 USD ($)	Apr. 03, 2017 USD ($)	Sep. 29, 2017 USD ($)	Feb. 28, 2014 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
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				$ 3,085	$ 0	$ 429
Capitalized financing costs to be amortized over term of facility			1,000
Total deferred financing costs included in other assets							1,200
Aggregate financing costs related to debt discount and debt issuance costs			1,800				$ (2,102)	$ (1,476)
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							$ 254,200
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]
Proceeds from lines of credit			$ 110,000
Credit facility, maximum borrowing capacity			400,000
Term loans [Member]
Line of Credit Facility [Line Items]
Proceeds from lines of credit			300,000
Credit facility, maximum borrowing capacity			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
AcademicWorks [Member] \| Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Total cash consideration paid for the acquisition				$ 52,100
JustGiving [Member]
Line of Credit Facility [Line Items]
Total cash consideration paid for the acquisition	$ 137,200	£ 102.4
JustGiving [Member] \| Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Proceeds from lines of credit	$ 138,700
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, 2017	Jun. 02, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Debt, gross	$ 440,326		$ 343,869
Less: Unamortized discount and debt issuance costs	2,102	$ (1,800)	1,476
Less: Debt, current portion	8,576		4,375
Debt, net of current portion	$ 429,648		$ 338,018
Weighted average effective interest rate	2.71%		2.48%
Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 143,000		$ 180,900
Weighted average effective interest rate	2.84%		2.36%
Term loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 296,250		$ 162,969
Weighted average effective interest rate	2.64%		2.62%
Short-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	3.03%		2.50%
Long-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	2.71%		2.48%
Loans payable [Member]
Line of Credit Facility [Line Items]
Other debt	$ 1,076		$ 0
Weighted average effective interest rate	4.50%		0.00%

Debt (Annual Maturities Related to Credit Facility and Other Debt) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Debt Disclosure [Abstract]
2018	$ 8,576
2019	7,500
2020	7,500
2021	7,500
2022	409,250
Thereafter	0
Total required maturities	$ 440,326

Derivative Instruments (Details) $ in Thousands, £ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 27, 2017 GBP (£)	Jul. 31, 2017 USD ($)	Jun. 28, 2017 GBP (£)	Oct. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Derivative [Line Items]
Proceeds from settlement of derivative instruments	$ 1,030	$ 0	$ 0
Ineffective portion of interest rate swap(s)	0	0	0
Undesignated derivative instruments	462	0	$ 0
March 2014 Swap [Member]
Derivative [Line Items]
Notional value of the swap agreement								$ 125,000
Future notional value of the swap agreement								$ 75,000
October 2015 Swap [Member]
Derivative [Line Items]
Notional value of the swap agreement							$ 75,000
July 2017 Swap [Member]
Derivative [Line Items]
Notional value of the swap agreement					$ 150,000
June 2017 Foreign Currency Option [Member]
Derivative [Line Items]
Notional value of the swap agreement \| £						£ 100.0
October 2017 Foreign Currency Forward [Member]
Derivative [Line Items]
Notional value of the swap agreement \| £				£ 103.5
Not designated as hedging instrument [Member]
Derivative [Line Items]
Derivative, fair value, net	$ 0	$ 0

Derivative Instruments (Fair Value of Derivative Instruments) (Details) - Designated as hedging instrument [Member] - Interest rate swap [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 1,283	$ 206
Derivative liabilities, fair value	0	163
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, current portion	145	0
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	1,138	206
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, long-term portion	$ 0	$ 163

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive loss	$ 1,283	$ 42	$ (31)
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated other comprehensive loss into income	$ (293)	$ (1,106)	$ (1,569)

Derivative Instruments (Effects of Undesignated Derivative Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gain (loss) recognized in income	$ 462	$ 0	$ 0
Foreign currency option contracts [Member]
Derivative [Line Items]
Gain (loss) recognized in income	513
Foreign currency forward contracts [Member]
Derivative [Line Items]
Gain (loss) recognized in income	$ (51)

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 ($) ft² lease	Oct. 31, 2008 lease	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Total minimum rentals to be received in the future under noncancelable subleases				$ 6.5
Total rent expense				16.1	$ 11.7	$ 10.3
Building [Member] \| Texas [Member]
Operating Leased Assets [Line Items]
Number of renewal options (leases) \| lease	2
Lease agreement renewal term	5 years
Annual base rent of operating lease				2.8
Standby letter of credit for security deposit				1.5
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				5.7
Current HQ Facility [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Reduction in rent expense					$ 2.9	$ 2.3
Current HQ Facility [Member] \| Building [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Lease agreement term			15 years
Number of renewal options (leases) \| lease			2
Lease agreement renewal term			5 years
Annual base rent of operating lease				4.3
Current HQ Facility [Member] \| Building [Member] \| South Carolina [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Percentage of change in base rent			5.50%
New HQ Facility [Member] \| Building [Member] \| South Carolina [Member]
Operating Leased Assets [Line Items]
Lease agreement term		20 years
Number of renewal options (leases) \| lease		4
Lease agreement renewal term		5 years
Rentable square feet (square foot) \| ft²		172,000
Estimated total rent payments		$ 104.2
Estimated total leasehold improvement allowances		$ 13.9
Third-party technology [Member]
Long-term Purchase Commitment [Line Items]
Remaining aggregate minimum purchase commitment				$ 66.8

Commitments and Contingencies (Future Minimum Lease Commitments Related to Lease Agreements, Net of Related Lease Incentives) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 18,373
2019	17,273
2020	15,407
2021	14,697
2022	14,696
Thereafter	82,789
Total minimum lease payments	$ 163,235

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
TCJ Act of 2017, change in tax rate, income tax benefit	$ 20,000
Discrete tax benefit, stock-based compensation	12,500
Net excess tax benefits from equity-based compensation recorded in stockholder's equity			$ 5,466
Unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate	4,600
Accrued interest and penalties	800
Reasonably possible decrease in unrecognized tax benefits	1,600
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	33,500
Tax credit carryforwards	3,600
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	31,200
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards	36,900
Tax credit carryforwards	$ 13,500
ASU 2016-09 [Member]
Income Taxes [Line Items]
Discrete tax benefit, stock-based compensation		$ 7,700

Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. Federal	$ 2,632	$ 4,655	$ 5,890
U.S. State and local	(144)	1,670	2,215
International	101	53	33
Total current taxes	2,589	6,378	8,138
U.S. Federal	(13,843)	2,544	2,702
U.S. State and local	398	304	585
International	(883)	185	(122)
Total deferred taxes	(14,328)	3,033	3,165
Total income tax provision	$ (11,739)	$ 9,411	$ 11,303

Income Taxes (Schedule of Income Before Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S.									$ 54,634	$ 49,320	$ 37,523
International									(440)	1,606	(571)
Income before provision for income taxes	$ 16,006	$ 15,341	$ 14,359	$ 8,488	$ 21,372	$ 10,884	$ 10,838	$ 7,832	$ 54,194	$ 50,926	$ 36,952

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Effect of:
State income taxes, net of federal benefit	1.60%	4.10%	5.70%
Fixed assets	0.00%	0.00%	(0.10%)
Unrecognized tax benefit	1.60%	0.20%	(1.10%)
State credits, net of federal benefit	(1.50%)	(0.10%)	6.00%
Change in valuation reserve (primarily state credit reserves)	(1.10%)	(1.60%)	(8.60%)
Federal credits generated	(6.20%)	(6.20%)	(6.10%)
Foreign tax rate	0.20%	(0.40%)	(0.70%)
Acquisition costs	2.40%	0.10%	0.10%
Section 162(m) limitation	2.70%	1.70%	0.10%
Loss from sale of foreign subsidiary	0.00%	0.00%	1.90%
Domestic production activities deduction	(0.00%)	(1.20%)	(1.80%)
Stock-based compensation	(20.30%)	(13.60%)	(0.00%)
Other	0.80%	0.30%	(1.90%)
Income tax provision effective rate	(21.70%)	18.50%	30.60%
Domestic Tax Authority [Member]
Effect of:
Change in income tax rate applied to deferred tax balances	(36.90%)	0.00%	0.00%
State and Local Jurisdiction [Member]
Effect of:
Change in income tax rate applied to deferred tax balances	0.00%	0.20%	2.10%

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets relating to:
Federal and state and foreign net operating loss carryforwards	$ 13,597	$ 12,906
Federal, state and foreign tax credits	14,389	9,924
Intangible assets	693	652
Stock-based compensation	9,611	11,480
Accrued bonuses	1,001	7,426
Deferred revenue	859	5,371
Allowance for doubtful accounts	1,379	1,294
Other	5,440	6,781
Total deferred tax assets	46,969	55,834
Deferred tax liabilities relating to:
Intangible assets	(47,997)	(44,885)
Fixed assets	(4,552)	(9,200)
Deferred sales commissions	(9,354)	(6,347)
Capitalized software development costs	(14,012)	(14,832)
Other	(995)	(755)
Total deferred tax liabilities	(76,910)	(76,019)
Valuation allowance	(7,205)	(6,994)	$ (7,911)	$ (11,161)
Net deferred tax liability	$ (37,146)	$ (27,179)

Income Taxes (Summary of Changes in Deferred Tax Asset Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 6,994	$ 7,911	$ 11,161
Charges to expense	211	(917)	(3,250)
Balance at end of year	$ 7,205	$ 6,994	$ 7,911

Income Taxes (Summary of Changes in Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Balance at December 31, 2016	$ 3,145	$ 3,024	$ 3,564
Increases from prior period positions	1,860	23	129
Decreases in prior year positions	(238)	(17)	(651)
Increases from current period positions	404	358	257
Settlements (payments)	0	0	(274)
Lapse of statute of limitations	(11)	(243)	(1)
Balance at December 31, 2017	$ 5,160	$ 3,145	$ 3,024

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of authorized stock-based awards available (in shares)	5,558,809
Unvested awards, compensation cost not yet recognized	$ 65.3
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
Vesting period (in years)	4 years
Restricted stock vested, total fair value	$ 19.4	$ 14.5	$ 10.6
Restricted stock granted, weighted average grant date fair value	$ 74.08	$ 53.59	$ 48.82
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years
Vesting period (in years)	3 years
Restricted stock vested, total fair value	$ 9.4	$ 6.7	$ 3.9
Restricted stock granted, weighted average grant date fair value	$ 72.19	$ 51.98	$ 45.15
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	7 years
Vesting period (in years)	4 years
Options exercised, total intrinsic value	$ 14.2	$ 10.7	$ 5.2
Options vested, total fair value		$ 1.0	$ 1.9
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, 2017	Dec. 31, 2016
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	1,257,574	1,178,592
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	493,248	465,395
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	212,506	469,075
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, number	2,050	3,502

Stock-Based Compensation (Summary of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 40,631	$ 32,638	$ 25,246
Cost of subscriptions [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	1,254	1,168	1,130
Cost of maintenance [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	373	508	420
Cost of services and other [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	1,843	1,621	1,944
Total included in cost of revenue [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	3,470	3,297	3,494
Sales, marketing and customer success [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	6,381	3,844	2,979
Research and development [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	7,765	6,467	4,865
General and administrative [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	23,015	19,030	13,908
Total included in operating expense [Member]
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 37,161	$ 29,341	$ 21,752

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, 2017

Dec. 31, 2016

Dec. 31, 2015

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

Unvested, number, beginning of period

1,178,592

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

$ 49.49

Granted, number

570,208

Granted, weighted average grant date fair value

$ 74.08

$ 53.59

$ 48.82

Vested, number

(410,087)

Vested, weighted average grant date fair value

$ 47.28

Forfeited, number

(81,139)

Forfeited, weighted average grant date fair value

$ 55.35

Unvested, number, end of period

1,257,574

1,178,592

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

$ 61.00

$ 49.49

Unvested, weighted average remaining contractual term

8 years 2 months 12 days

Unvested, aggregate intrinsic value

^[1]

$ 118,828

[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, 2017

Dec. 31, 2016

Dec. 31, 2015

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

Unvested, number, beginning of period

465,395

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

$ 47.51

Granted, number

247,471

Granted, weighted average grant date fair value

$ 72.19

$ 51.98

$ 45.15

Forfeited, number

(8,157)

Forfeited, weighted average grant date fair value

$ 51.75

Vested, number

(211,461)

Vested, weighted average grant date fair value

$ 44.65

Unvested, number, end of period

493,248

465,395

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

$ 61.05

$ 47.51

Unvested, weighted average remaining contractual term

8 years 3 months 18 days

Unvested, aggregate intrinsic value

^[1]

$ 46,607

[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, 2017

USD ($)

$ / shares

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

Outstanding, number, beginning of period | shares

469,075

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

$ 23.63

Exercised, number | shares

(256,569)

Exercised, weighted average exercise price | $ / shares

$ 24.14

Outstanding, number, end of period | shares

212,506

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

$ 23.01

Outstanding, weighted average remaining contractual term

1 year 9 months 18 days

Outstanding, aggregate intrinsic value | $

$ 15,191

^[1]

Vested and exercisable, number | shares

212,506

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

$ 23.01

Vested and exercisable, weighted average remaining contractual term

1 year 9 months 18 days

Vested and exercisable, aggregate intrinsic value | $

$ 15,191

^[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, 2017

USD ($)

$ / shares

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

Outstanding, number, beginning of period | shares

3,502

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

$ 11.25

Exercised, number | shares

(1,400)

Exercised, weighted average exercise price | $ / shares

$ 10.99

Expired, number | shares

(52)

Expired, weighted average exercise price | $ / shares

$ 10.59

Outstanding, number, end of period | shares

2,050

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

$ 11.44

Outstanding, weighted average remaining contractual term

10 months 24 days

Outstanding, aggregate intrinsic value | $

$ 170

^[1]

Vested and exercisable, number | shares

2,050

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

$ 11.44

Vested and exercisable, weighted average remaining contractual term

10 months 24 days

Vested and exercisable, aggregate intrinsic value | $

$ 170

^[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. 15, 2017	Sep. 15, 2017	Jun. 15, 2017	Mar. 15, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 15, 2018	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, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	$ (457)	$ (825)	$ (1,032)
Translation adjustments	(943)	324	62
Accumulated other comprehensive (loss) income, end of period	(649)	(457)	(825)
Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	25	(19)	(164)
Other comprehensive income (loss) before reclassifications	574	(626)	(818)
Amounts reclassified from accumulated other comprehensive loss to interest expense	293	1,106	1,569
Amounts reclassified from accumulated other comprehensive loss to loss on debt extinguishment and termination of derivative instruments	0	0	0
Tax benefit included in provision for income taxes	(116)	(436)	(606)
Total amounts reclassified from accumulated other comprehensive loss	177	670	963
Net current-period other comprehensive income	751	44	145
Accumulated other comprehensive (loss) income, end of period	776	25	(19)
Unrealized (losses) gains, tax effects	(374)	406	514
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	(482)	(806)	(868)
Translation adjustments	(943)	324	62
Accumulated other comprehensive (loss) income, end of period	$ (1,425)	$ (482)	$ (806)

Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
Defined Contribution Plan (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of qualified employees' contribution	50.00%	50.00%	50.00%
Employer matching contributions, total	$ 7.1	$ 7.6	$ 5.3
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%	30.00%
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, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 42,243	$ 50,269
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	39,071	47,663
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 3,172	$ 2,606

Disaggregation of Revenue (Revenue by Geography) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disaggregation of Revenue [Line Items]
Total revenue	$ 216,977	$ 195,513	$ 192,195	$ 183,621	$ 198,305	$ 183,063	$ 180,191	$ 169,256	$ 788,306	$ 730,815	$ 637,940
United States [Member]
Disaggregation of Revenue [Line Items]
Total revenue									706,798	660,339	570,519
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Total revenue									$ 81,508	$ 70,476	$ 67,421

Disaggregation of Revenue (Revenue by Market Group) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disaggregation of Revenue [Line Items]
Total revenue	$ 216,977	$ 195,513	$ 192,195	$ 183,621	$ 198,305	$ 183,063	$ 180,191	$ 169,256	$ 788,306	$ 730,815	$ 637,940
GMG [Member]
Disaggregation of Revenue [Line Items]
Total revenue									406,954	383,319	313,935
EMG [Member]
Disaggregation of Revenue [Line Items]
Total revenue									330,930	302,968	279,897
IMG [Member]
Disaggregation of Revenue [Line Items]
Total revenue									48,429	42,539	41,997
Other [Member]
Disaggregation of Revenue [Line Items]
Total revenue									$ 1,993	$ 1,989	$ 2,111

Quarterly Results (unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 216,977	$ 195,513	$ 192,195	$ 183,621	$ 198,305	$ 183,063	$ 180,191	$ 169,256	$ 788,306	$ 730,815	$ 637,940
Gross profit	114,555	108,508	105,200	98,139	105,903	99,746	96,579	89,367	426,402	391,595	333,309
Income from operations	18,739	17,965	16,748	10,579	24,024	13,540	13,624	10,612	64,031	61,800	46,712
Income before provision for income taxes	16,006	15,341	14,359	8,488	21,372	10,884	10,838	7,832	54,194	50,926	36,952
Net income	$ 30,709	$ 12,548	$ 11,165	$ 11,511	$ 17,284	$ 8,934	$ 9,060	$ 6,237	$ 65,933	$ 41,515	$ 25,649
Earnings per share, basic	$ 0.66	$ 0.27	$ 0.24	$ 0.25	$ 0.37	$ 0.19	$ 0.20	$ 0.14	$ 1.41	$ 0.90	$ 0.56
Earnings per share, diluted	$ 0.64	$ 0.26	$ 0.23	$ 0.24	$ 0.36	$ 0.19	$ 0.19	$ 0.13	$ 1.38	$ 0.88	$ 0.55

Disposition of Business (Details) - RLC [Member] - Disposal group, disposed of by sale, not discontinued operations [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	May 18, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross cash proceeds from disposition of business		$ 0.4
Goodwill, derecognized related to disposition of business	$ 1.4
Loss on disposition of business	$ 2.0

Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
Restructuring (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 794	$ 0	$ 0
Contract termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 800

Restructuring (Schedule of Restructuring Costs) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Restructuring and Related Activities [Abstract]
Contract termination costs	$ 794
Total	$ 794

Restructuring (Schedule of Restructuring Reserve by Type of Cost) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 585
Contract termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 585