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Annual Maturities Related to Credit Facility, Real Estate Loans and other debt Schedule of Maturities of Long-term Debt [Table Text Block] Net current-period other comprehensive income (loss) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Derivative liabilities Derivative Liability Reportable segment Segment Reporting, Policy [Policy Text Block] Security incident, accrued insurance recoveries Security Incident, Accrued Insurance Recoveries Security Incident, Accrued Insurance Recoveries Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Entity filer category Entity Filer Category Other assets Less: Long-term portion Other Assets, Noncurrent Segments [Axis] Segments [Axis] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Other countries [Member] Other countries [Member] Countries excluding separately disclosed countries. 2023  Long-Term Debt, Maturity, Year Two Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Security incident, number of customer reimbursement requests settled Security incident, number of customer reimbursement requests settled Security incident, number of customer reimbursement requests settled 2021 - remaining Long-Term Debt, Maturity, Remainder of Fiscal Year Document fiscal year focus Document Fiscal Year Focus Subsequent Event Type [Domain] Subsequent Event Type [Domain] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amortization Amortization of Intangible Assets Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Variable lease cost Variable Lease, Cost Anti-dilutive shares excluded from calculations of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Revenue recognized that was included in deferred revenue at beginning of period Contract with Customer, Liability, Revenue Recognized Derivative liabilities, fair value Derivative Liability, Fair Value, Amount Not Offset Against Collateral Research and development [Member] Research and Development Expense [Member] Subsequent Events [Abstract] Subsequent Events [Abstract] Cash flow hedging [Member] Gains and losses on cash flow hedges [Member] Cash Flow Hedging [Member] One-time services and other [Member] Technology Service [Member] Credit Facility [Domain] Credit Facility [Domain] Assets Assets [Abstract] Tax benefit included in provision for income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax 2024  Long-Term Debt, Maturity, Year Three Other liabilities [Member] Other Liabilities [Member] Receivables for probable insurance recoveries Estimated Insurance Recoveries Transactional recurring [Member] Transactional Recurring [Member] Transactional Recurring Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Preferred stock; 20,000,000 shares authorized, none outstanding Preferred Stock, Value, Issued Payment of dividends Dividends, Cash Entity address, city Entity Address, City or Town Retained earnings [Member] Retained Earnings [Member] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Derivatives Instruments Derivatives and Fair Value [Text Block] Term loans [Member] Secured Debt [Member] Accounts receivable Increase (Decrease) in Accounts Receivable Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Prepaid software maintenance and subscriptions, current and long-term Prepaid Software Maintenance, Current and Long-term Carrying amount as of the balance sheet date of amounts paid for software maintenance in advance of when the expense is to be recognized. Includes current and non-current portions. Customer funds receivable Other Restricted Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Short-term debt [Member] Short-term Debt [Member] Entity interactive data current Entity Interactive Data Current Deferred revenue Increase (Decrease) in Deferred Revenue Total included in operating expenses [Member] Operating Expense [Member] Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Liability insurance, amount, deductible Liability Insurance, Amount, Deductible Liability Insurance, Amount, Deductible Basic earnings per share Earnings Per Share, Basic Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Revenue Recognition Revenue from Contract with Customer [Text Block] Sublease income Sublease Income Document type Document Type 2022  Long-Term Debt, Maturity, Year One Canada [Member] CANADA Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Forward-Starting Interest Rate Swaps [Member] Forward-Starting Interest Rate Swaps [Member] Forward-Starting Interest Rate Swaps Entity current reporting status Entity Current Reporting Status Accrued vacation costs Accrued Vacation Costs of obtaining contracts Capitalized Contract Cost, Net Employee taxes paid for withheld shares upon equity award settlement Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Other non-cash adjustments Other Noncash Income (Expense) Real estate escrow balances Escrow Deposit Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Provision for doubtful accounts and sales returns Accounts Receivable, Credit Loss Expense (Reversal) Aggregate principal amount assumed Debt, gross Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Taxes, prepaid and receivable Taxes, Prepaid And Receivable, Current and Long-term Carrying amount as of the balance sheet date of payments made in advance for income and other taxes. Includes current and non-current portions. Total required maturities Long-term Debt Total financial assets Assets, Fair Value Disclosure Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Other liabilities Other Liabilities Document transition report Document Transition Report Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] July 2017 Swap [Member] July 2017 Swap [Member] July 2017 Swap [Member] Total liabilities and stockholders' equity Liabilities and Equity Accrued legal costs Accrued Professional Fees Deferred revenue, current portion Contract with Customer, Liability, Current Contractual recurring [Member] Contractual Recurring [Member] Contractual Recurring Restricted cash due to customers Restricted Cash Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Liabilities and stockholders' equity Liabilities and Equity [Abstract] Hedging Relationship [Domain] Hedging Relationship [Domain] Interest rate swap [Member] Interest Rate Swap [Member] Derivative liabilities, current portion Derivative Liability, Current Earnings Per Share Earnings Per Share [Text Block] Purchase of treasury shares under stock repurchase program, cost method Purchase of treasury shares under stock repurchase program, cost method, value Treasury Stock, Value, Acquired, Cost Method Operating expenses Operating Expenses [Abstract] Effects of Derivative Instruments in Cash Flow Hedging Relationships Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Consolidated Financial Statement Details Additional Financial Information Disclosure [Text Block] Components of Restricted Cash Schedule Of Restricted Cash [Table Text Block] Schedule Of Restricted Cash Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Gross profit Gross Profit Balance Sheet Location [Domain] Balance Sheet Location [Domain] Total financial liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Preferred stock, shares authorized Preferred Stock, Shares Authorized Derivative assets, current portion Derivative Asset, Current Trading symbol Trading Symbol United Kingdom [Member] UNITED KINGDOM Current liabilities: Liabilities, Current [Abstract] Accrued expenses and other current liabilities [Member] Accrued expenses and other current liabilities [Member] Primary financial statement caption encompassing accrued expenses and other current liabilities. Capitalized software development costs Payments to Develop Software 2025  Long-Term Debt, Maturity, Year Four General and administrative General and Administrative Expense Foreign currency translation adjustment [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Debt Debt Disclosure [Text Block] Restricted stock grants Stock Issued During Period, Value, Restricted Stock Award, Gross Amounts reclassified from accumulated other comprehensive (loss) income to interest expense Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Earnings The amount of gains (losses) reclassified in the period from accumulated other comprehensive income (loss) to earnings. Stock-Based Compensation Share-based Payment Arrangement [Text Block] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Derivative instruments Derivative Assets, Current and Long-term Carrying amount as of the balance sheet date of derivative assets. Includes current and non-current portions. Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Implementation costs for cloud computing arrangements Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization Cost of revenue Cost of Revenue [Abstract] November 2020 Swap 4 [Member] November 2020 Swap 4 [Member] November 2020 Swap 4 Common stock, $0.001 par value; 180,000,000 shares authorized, 62,332,714 and 60,904,638 shares issued at June 30, 2021 and December 31, 2020, respectively Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Unaudited interim consolidated financial statements Basis of Accounting, Policy [Policy Text Block] Security incident, number of reservations of the right to seek future expense recovery Security incident, number of reservations of the right to seek future expense recovery Security incident, number of reservations of the right to seek future expense recovery Commitments and contingencies (see Note 9) Commitments and Contingencies Subsequent Event [Table] Subsequent Event [Table] Accumulated other comprehensive income (loss) Accumulated other comprehensive (loss) income, beginning of period Accumulated other comprehensive income (loss), end of period Accumulated Other Comprehensive Income (Loss), Net of Tax Accounts receivable, allowance Accounts Receivable, Allowance for Credit Loss, Current Schedule of Interest Rate Swaps Schedule of Interest Rate Derivatives [Table Text Block] November 2020 Swap 3 [Member] November 2020 Swap 3 [Member] November 2020 Swap 3 Proceeds from issuance of debt Proceeds from Issuance of Debt Document period end date Document Period End Date Stock-based awards Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Summary of Other Debt Schedule Of Debt Instruments, Other [Table Text Block] Schedule Of Debt Instruments, Other Entity registrant name Entity Registrant Name Treasury stock, shares Treasury Stock, Shares Components of Accrued Expenses and Other Liabilities Accrued Expenses And Other Liabilities [Text Block] The disclosure describes the Company's accrued expenses and other liabilities. November 2020 Swap 2 [Member] November 2020 Swap 2 [Member] November 2020 Swap 2 Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Revenue Revenue from Contract with Customer, Excluding Assessed Tax Other income (expense), net Other income (expense), net Nonoperating Income (Expense), Excluding Interest Expense The aggregate amount of income or expense, excluding interest expense, from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Dividend payments to stockholders Payments of Dividends Equity [Abstract] Equity [Abstract] Fair Value Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] Third-party technology [Member] Third-party Technology [Member] Technology developed by a third-party used in conjunction with entity's products and services. Interest income Investment Income, Interest Common stock [Member] Common Stock [Member] July 2021 Swap [Member] July 2021 Swap [Member] July 2021 Swap Income from operations Operating Income (Loss) Global HQ [Member] Global HQ [Member] Global HQ [Member] Exercise of stock options and vesting of restricted stock units (in shares) Exercise Of Stock Options And Stock Appreciation Rights Shares Number of shares issued during the period as a result of the exercise of stock options and stock appreciation rights. Operating lease liabilities, current portion Operating Lease, Liability, Current Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Hedging Designation [Axis] Hedging Designation [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Long-term debt [Member] Long-term Debt [Member] Additional paid-in capital [Member] Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Payments on debt Repayments of Debt Dividends per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Effect of exchange rate on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Treasury stock [Member] Treasury Stock [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Derivative, notional amount Derivative, Notional Amount Other assets [Member] Other Assets [Member] Other income (expense), net Other Nonoperating Income (Expense) Remaining aggregate minimum purchase commitment Long-term Purchase Commitment, Remaining Minimum Amount Committed Minimum amount to be expended to satisfy the terms of long-term purchase arrangements in which the entity has agreed to expend funds to procure goods or services. Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Customer credit balances Accrued Customer Credit Balances, Current and Long-term Carrying value as of the balance sheet date of obligations to customers for credit balances generated by customer overpayments. Includes current and non-current portions. Total liabilities Liabilities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Total stockholders' equity Balance Balance Stockholders' Equity Attributable to Parent Software development costs, net Capitalized Software Development Costs for Software Sold to Customers November 2020 Swap 1 [Member] November 2020 Swap 1 [Member] November 2020 Swap 1 Common stock, shares issued Common Stock, Shares, Issued Ineffective portion of interest rate swap(s) Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Total restricted cash Total restricted cash Restricted Cash and Cash Equivalents, Current Designated as hedging instrument [Member] Designated as Hedging Instrument [Member] Implementation costs for cloud computing arrangements, accumulated amortization Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, Accumulated Amortization Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Employee taxes paid for withheld shares upon equity award settlement (in shares) Surrender Of Shares Upon Restricted Stock And Restricted Unit Vesting And Exercise of Stock Appreciation Rights Number of shares that have been surrendered upon vesting of restricted stock/restricted stock units or exercise of stock appreciation rights during the period and are being held in treasury. Taxes payable Taxes Payable Purchase of treasury stock Payments for Repurchase of Common Stock Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Changes in Accumulated Other Comprehensive Income (Loss) by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Change in customer funds receivable Change In Customer Funds Receivable Change In Customer Funds Receivable Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Derivative assets, long-term portion Derivative Asset, Noncurrent Measurement Frequency [Domain] Measurement Frequency [Domain] Other debt, face amount Debt Instrument, Face Amount Interest expense Interest Expense Weighted average effective interest rate Debt Instrument, Interest Rate, Effective Percentage Amortization expense from costs of obtaining contracts Capitalized Contract Cost, Amortization City area code City Area Code Retained earnings Retained Earnings (Accumulated Deficit) Recurring [Member] Recurring [Member] Recurring [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Business Acquisition [Line Items] Business Acquisition [Line Items] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Income Statement [Abstract] Income Statement [Abstract] Amendment flag Amendment Flag Total prepaid expenses and other assets Prepaid Expense and Other Assets Proceeds from exercise of stock options Proceeds from Stock Options Exercised Disaggregation Of Revenue, Recurring Disaggregation Of Revenue, Recurring [Table Text Block] Disaggregation Of Revenue, Recurring Restricted stock grants (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Income tax provision Income Tax Expense (Benefit) Accounts receivable, net of allowance of $9,911 and $10,292 at June 30, 2021 and December 31, 2020, respectively Accounts Receivable, after Allowance for Credit Loss, Current Statement, Equity Components [Axis] Equity Components [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Total current assets Assets, Current Sales, marketing and customer success [Member] Selling and Marketing Expense [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Accrued expenses and other liabilities Increase Decrease Accrued Expenses And Other Liabilities The net change during the reporting period in accrued expenses and other liabilities. Entity file number Entity File Number Accrued health care costs Accrued Insurance Total amounts reclassified from accumulated other comprehensive (loss) income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Debt, current portion Less: Debt, current portion Long-term Debt, Current Maturities Product and Service [Axis] Product and Service [Axis] Entity incorporation, state or country code Entity Incorporation, State or Country Code Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Entity small business Entity Small Business Components of Other Income and Expense Other Income and Other Expense Disclosure [Text Block] Equity Component [Domain] Equity Component [Domain] Sales, marketing and customer success Selling and Marketing Expense Foreign currency translation adjustment Translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Cost of recurring [Member] Cost Of Recurring [Member] Cost Of Recurring [Member] IMG [Member] International Markets Group [Member] International Markets Group [Member] Statement [Line Items] Statement [Line Items] Restricted stock cancellations (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Category of Item Purchased [Axis] Category of Item Purchased [Axis] Security incident, number of consumer class action cases Security incident, number of consumer class action cases Security incident, number of consumer class action cases Revenue, remaining performance obligation Revenue, Remaining Performance Obligation, Amount Summary of Stock-Based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Security incident, expense Security Incident, Expense Security Incident, Expense UMG [Member] U.S. Markets Group [Member] U.S. Markets Group Debt Disclosure [Abstract] Debt Disclosure [Abstract] Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Entity address, state Entity Address, State or Province Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Deferred revenue, net of current portion Contract with Customer, Liability, Noncurrent Other comprehensive income (loss), unrealized gain (loss) on derivatives arising during period, tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Use of estimates Use of Estimates, Policy [Policy Text Block] Trade accounts payable Increase (Decrease) in Accounts Payable, Trade Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Entity shell company Entity Shell Company Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Local phone number Local Phone Number Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other debt Other Long-term Debt Accumulated other comprehensive loss expected to be reclassified into earnings within next 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Total assets Assets Common stock, shares authorized Common Stock, Shares Authorized Geographical [Domain] Geographical [Domain] Security incident, cumulative expense Security Incident, Cumulative Expense Security Incident Cumulative Expense Research and development Research and Development Expense Product and Service [Domain] Product and Service [Domain] Exercise of stock options and vesting of restricted stock units Exercise Of Stock Options And Stock Appreciation Rights Value Value stock issued during the period as a result of the exercise of stock options and stock appreciation rights. Prepaid insurance Prepaid Insurance Current and Long term Amount of asset related to consideration paid in advance for insurance. Includes current and non-current portions. Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Derivative Contract [Domain] Derivative Contract [Domain] Liability insurance, amount, total Liability Insurance, Amount, Total Liability Insurance, Amount, Total Revolving credit loans [Member] Revolving Credit Facility [Member] Revenue, remaining performance obligation, expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Measurement Frequency [Axis] Measurement Frequency [Axis] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Other [Member] Other Segments [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Components of Lease Expense Lease, Cost [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Entity tax identification number Entity Tax Identification Number Subsequent Event [Line Items] Subsequent Event [Line Items] Geographical [Axis] Geographical [Axis] Total accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Basic weighted average shares Weighted average common shares Weighted Average Number of Shares Outstanding, Basic Diluted earnings per share Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Amortization of deferred financing costs and discount Amortization of Debt Issuance Costs and Discounts Gain (loss) reclassified from accumulated other comprehensive loss into income Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Axis] Interest expense [Member] Interest Expense [Member] Due to customers Due To Customers Current Carrying value as of the balance sheet date of donations collected by the entity on behalf of its customers and payable to its customers. Also includes amounts classified as customer funds receivable. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Subsequent Events Subsequent Events [Text Block] Change in due to customers Proceeds from (Repayments of) Restricted Cash, Financing Activities Unbilled accounts receivable Unbilled Contracts Receivable Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Total deferred revenue Contract with Customer, Liability Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Treasury stock, at cost; 13,451,524 and 12,054,268 shares at June 30, 2021 and December 31, 2020, respectively Treasury Stock, Value Common shares and equivalents outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Deferred tax liability Deferred Income Tax Liabilities, Net Derivative assets, fair value Derivative Asset, Fair Value, Amount Not Offset Against Collateral Loans payable [Member] Loans Payable [Member] Derivative liabilities, long-term portion Derivative Liability, Noncurrent Restructuring Restructuring Charges Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Accumulated other comprehensive income (loss) [Member] AOCI Attributable to Parent [Member] Other assets Other Assets Cost of revenue Cost of Goods and Services Sold Revenue Revenues [Abstract] Implementation costs for cloud computing arrangements, amortization Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization Gain (loss) recognized in accumulated other comprehensive loss Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Prepaid software maintenance and subscriptions, current Prepaid Software Maintenance, Current Carrying amount as of the balance sheet date of amounts paid for software maintenance in advance of when the expense is to be recognized. Includes current portion only. Net lease cost Lease, Cost Schedule of Effective Income Tax Rates Schedule Of Effective Income Tax Rate [Table Text Block] Schedule Of Effective Income Tax Rate [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Long-term Purchase Commitment [Line Items] Long-term Purchase Commitment [Line Items] Property and equipment, net Property, Plant and Equipment, Net Accrued commissions and salaries Accrued Commissions And Salaries, Current and Long-term Carrying value as of the balance sheet date of obligations incurred and payable for salaries and sales commissions earned by employees. Includes current and non-current portions. Total operating expenses Operating Expenses Other liabilities Less: Long-term portion Other Liabilities, Noncurrent Summary of Debt Schedule of Long-term Debt Instruments [Table Text Block] Purchase of treasury shares under stock repurchase program (in shares) Treasury Stock, Shares, Acquired Schedule of Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] Earnings per share Earnings Per Share [Abstract] Earnings Per Share [Abstract] Derivative assets Derivative Asset Document quarterly report Document Quarterly Report Revenue, remaining performance obligation, percentage to be recognized Revenue, Remaining Performance Obligation, Percentage Line of Credit Facility [Table] Line of Credit Facility [Table] Entity common stock, shares outstanding Entity Common Stock, Shares Outstanding Debt, net of current portion Long-term Debt, Excluding Current Maturities Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Allocated stock-based compensation expense Share-based Payment Arrangement, Expense Earnings (Loss) Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Document fiscal period focus Document Fiscal Period Focus Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Unrealized gain (loss) on derivative instruments, net of tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Total cash, cash equivalents and restricted cash in the statement of cash flows Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Balance (in shares) Balance (in shares) Shares, Issued US Federal [Member] United States [Member] UNITED STATES Common stock, par value Common Stock, Par or Stated Value Per Share Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Derivative instruments Derivative Liabilities, Current and Long-term Carrying amount as of the balance sheet date of derivative liabilities. Includes current and non-current portions. Current assets: Assets, Current [Abstract] Entity central index key Entity Central Index Key Security exchange name Security Exchange Name Diluted weighted average shares outstanding Weighted average common shares assuming dilution Weighted Average Number of Shares Outstanding, Diluted Insurance recoveries Insurance Recoveries Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Fair value measurements, recurring [Member] Fair Value, Recurring [Member] Income Taxes Income Tax Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current fiscal year end date Current Fiscal Year End Date Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Accrued expenses and other current liabilities Accrued Expenses And Other Current Liabilities, Carrying value as of the balance sheet date of obligations incurred, for which invoices have typically not been received that are payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Includes aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other comprehensive (loss) income before reclassifications, net of tax effects Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent Before Reclassifications Net of tax amount of other comprehensive income (loss) attributable to the parent entity before reclassifications into income. Name of Property [Axis] Name of Property [Axis] Credit Facility [Axis] Credit Facility [Axis] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Changes in operating assets and liabilities, net of acquisition and disposal of businesses: Increase (Decrease) in Operating Capital [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] General and administrative [Member] General and Administrative Expense [Member] Basis of consolidation Consolidation, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Total current liabilities Liabilities, Current Employee taxes paid for withheld shares upon equity award settlement Payment, Tax Withholding, Share-based Payment Arrangement Security incident, cumulative accrued insurance recoveries Security Incident, Cumulative Accrued Insurance Recoveries Security Incident, Cumulative Accrued Insurance Recoveries Credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Effect of foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Trade accounts payable Accounts Payable, Trade, Current Thereafter Long Term Debt Maturities Repayments Of Principal After Year Four Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Entity address, postal zip code Entity Address, Postal Zip Code Less: Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Title of 12(b) security Title of 12(b) Security Security incident, number of customer reimbursement requests received Security incident, number of customer reimbursement requests received Security incident, number of customer reimbursement requests received Statement [Table] Statement [Table] Unrecognized tax benefit Unrecognized Tax Benefit, Current and Long-term Liability for uncertain tax positions as of the balance sheet date. Includes current and non-current portions. Prepaid expenses and other current assets [Member] Prepaid Expenses and Other Current Assets [Member] Subsequent event [Member] Subsequent Event [Member] Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cover [Abstract] Cover [Abstract] Mortgages [Member] Mortgages [Member] Goodwill Balance at December 31, 2020 Balance at June 30, 2021 Goodwill Total included in cost of revenue [Member] Cost of Sales [Member] Name of Property [Domain] Name of Property [Domain] Change in Goodwill Schedule of Goodwill [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Fair Values of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Operating lease cost Operating Lease, Cost Current portion of costs of obtaining contracts Capitalized Contract Cost, Net, Current Deferred taxes Deferred Income Tax Expense (Benefit)