Business combinations Business Combinations Policy [Policy Text Block] Granted, number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Unrealized (loss) gain on derivative instruments, net of tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Intangible assets Deferred Tax Liabilities, Intangible Assets Document type Document Type ICFR auditor attestation flag ICFR Auditor Attestation Flag Other (expense) income, net Other Nonoperating Income (Expense) Security incident, number of state Attorneys General Security incident, number of state Attorneys General Security incident, number of state Attorneys General Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Treasury stock [Member] Treasury Stock [Member] Segments [Axis] Segments [Axis] Receivables for probable insurance recoveries Estimated Insurance Recoveries Net current-period other comprehensive (loss) income Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Cash, cash equivalents and restricted cash, beginning of year Cash, cash equivalents and restricted cash, end of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Changes in Accumulated Other Comprehensive Loss by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Vested, weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Components of Prepaid Expenses and Other Assets Schedule Of Prepaid Expenses And Other Assets Current [Table Text Block] Tabular disclosure of components of prepaid expenses and other current assets. Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Leases Lessee, Leases [Policy Text Block] Insurance recoveries Insurance Recoveries Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Line of credit facility, available increase capacity, amount Line of Credit Facility, Available Increase Capacity, Amount Maximum allowable increase amount provided in credit facility to increase revolving credit commitments and/or request additional term loans. Future amortization expense for finite-lived intangible assets: Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Security incident, probable insurance recoveries Security Incident, Accrued Insurance Recoveries Security Incident, Accrued Insurance Recoveries Operating lease, lease not yet commenced, expense Operating Lease, Lease Not Yet Commenced, Expense Amount of operating lease expense, excluding sublease income, for leases that have not yet commenced. Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities and stockholders' equity Liabilities and Equity [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Other comprehensive (loss) income before reclassifications, net of tax effects of $1,625, $860 and $(239) Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Deferred tax liability Deferred Income Tax Liabilities, Net Proceeds from issuance of debt Proceeds from Issuance of Debt Security exchange name Security Exchange Name Intangible assets, net Intangible assets, net (excluding goodwill) Intangible Assets, Net (Excluding Goodwill) Defined Contribution Plan Compensation and Employee Benefit Plans [Text Block] Sales, marketing and customer success [Member] Selling and Marketing Expense [Member] Income from operations (Loss) income from operations Operating Income (Loss) Capitalized financing costs to be amortized over term of facility Payments of Debt Issuance Costs Total current liabilities Liabilities, Current Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Components of Deferred Revenue Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Unvested, weighted average grant date fair value, beginning of period Unvested, weighted average grant date fair value, end of period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Derivative liabilities, fair value Derivative Liability, Fair Value, Amount Not Offset Against Collateral Senior Secured Note, Series A2 [Member] Senior Secured Note, Series A2 [Member] Senior Secured Note, Series A2 Variable Rate [Domain] Variable Rate [Domain] Variable Rate [Axis] Variable Rate [Axis] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and contingencies (see Note 9) Commitments and Contingencies Change in valuation reserve (primarily state credit reserves) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Employee taxes paid for withheld shares upon equity award settlement Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Purchase of treasury stock Payments for Repurchase of Common Stock Assets Assets [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Accounting Policies [Abstract] Accounting Policies [Abstract] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Accrued bonuses Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Bonuses Furniture and fixtures [Member] Furniture and Fixtures [Member] Restricted cash due to customers; customer funds receivable; due to customers Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Entity address, state or province Entity Address, State or Province Vested, number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Operating cash flows from operating leases Operating Lease, Payments Stock appreciation rights (SARs) [Member] Stock Appreciation Rights (SARs) [Member] Effect of foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Sublease income Sublease Income Approximate number of customers distributed across verticals Active Customers Number of active customers as of period end date. 2023  Long-Term Debt, Maturity, Year Three Software development costs, software for internal use Internal Use Software, Policy [Policy Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Repayments of lines of credit Repayments of Lines of Credit Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Fixed assets Deferred Tax Liabilities, Property, Plant and Equipment Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] 2021  Lessee, Operating Lease, Liability, to be Paid, Year One Purchase of treasury shares under stock repurchase program (in shares) Treasury stock, shares, acquired Treasury Stock, Shares, Acquired Outstanding, number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2024  Lessee, Operating Lease, Liability, to be Paid, Year Four Finite-lived intangible assets, amortization method Finite-Lived Intangible Assets, Amortization Method Pre-tax costs related to real estate activities Pre-tax Costs Related to Real Estate Activities Pre-tax Costs Related to Real Estate Activities 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] Unvested awards, compensation cost not yet recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Canada [Member] CANADA U.S. State and local Current State and Local Tax Expense (Benefit) Tax credit carryforwards Tax Credit Carryforward, Amount Undesignated derivative instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Preferred stock; 20,000,000 shares authorized, none outstanding Preferred Stock, Value, Issued DTA Adjustment – NOLs Effective Income Tax Rate Reconciliation, DTA Adjustments Effective Income Tax Rate Reconciliation, DTA Adjustments Income taxes Income Tax, Policy [Policy Text Block] Hedging Designation [Domain] Hedging Designation [Domain] Net lease cost Lease, Cost Total operating expenses Operating Expenses Building [Member] Building [Member] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Common stock, par value Common Stock, Par or Stated Value Per Share Debt issuance costs Payment of financing costs Payments of Financing Costs Other liabilities Less: Long-term portion Other Liabilities, Noncurrent Other investing activities Payments for (Proceeds from) Other Investing Activities Cost of revenue Cost of Revenue [Abstract] Ineffective portion of interest rate swap(s) Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Thereafter Long-Term Debt, Maturity, after Year Five Revenue Revenue from Contract with Customer, Excluding Assessed Tax Measurement Frequency [Domain] Measurement Frequency [Domain] Advertising costs Advertising Expense Customer funds receivable Other Restricted Assets, Current Acquired restricted cash liabilities due to customers Liabilities Assumed Business Acquisition [Axis] Business Acquisition [Axis] Geographical [Domain] Geographical [Domain] Amortization expense from costs of obtaining contracts Capitalized Contract Cost, Amortization Contractual term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Statement [Line Items] Statement [Line Items] International Deferred Foreign Income Tax Expense (Benefit) Prepaid software maintenance and subscriptions 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. Earnings (Loss) Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Computer hardware [Member] Computer Equipment [Member] Debt instrument, term Debt Instrument, Term Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Change in due to customers Proceeds from (Repayments of) Restricted Cash, Financing Activities Entity voluntary filers Entity Voluntary Filers February 2018 Swap [Member] February 2018 Swap [Member] February 2018 Swap [Member] Future annual before-tax savings related to real estate activities Future Annual Before-Tax Savings Related to Real Estate Activities Future Annual Before-Tax Savings Related to Real Estate Activities Statement [Table] Statement [Table] Write-off Accounts Receivable, Allowance for Credit Loss, Writeoff Statistical Measurement [Axis] Statistical Measurement [Axis] Cost of one-time services and other [Member] Cost of One-time Services and Other [Member] Cost of One-time Services and Other Credit Facility [Axis] Credit Facility [Axis] Change in income tax rate applied to deferred tax balances Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Reclassification upon early adoption of ASU 2018-02 Reclassification upon adoption of ASU 2018-02 StockholdersEquityASU201802Adoption This element represents movements included in the statement of stockholders' equity which are specifically related to the adoption of ASU 2018-02. Derivative instruments Derivative Liability, Noncurrent Foreign Tax Authority [Member] Foreign Tax Authority [Member] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Business Combinations [Abstract] Business Combinations [Abstract] Entity small business Entity Small Business Basis of consolidation Consolidation, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Forward-starting interest rate swaps Forward-Starting Interest Rate Swaps [Member] Forward-Starting Interest Rate Swaps Credit facility, variable interest rate Line Of Credit Facility Variable Interest Rate Line Of Credit Facility Variable Interest Rate Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Expected period of benefit Capitalized Contract Cost, Amortization Period Accrued vacation costs Accrued Vacation Less: accumulated amortization Capitalized Computer Software, Accumulated Amortization Stock-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent Goodwill [Roll Forward] Goodwill [Roll Forward] Amendment flag Amendment Flag Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Summary of Awards Outstanding by Each Award Type Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Common shares and equivalents outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Total number of authorized stock-based awards available (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Research and development Research and Development Expense, Policy [Policy Text Block] Deferred tax assets relating to: Deferred Tax Assets, Gross [Abstract] Cover page. [Abstract] Cover page. [Abstract] Cover page. [Abstract] Payments on debt Repayments of Debt 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. Restricted stock cancellations (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Base salary requirement for one-time bonus Base Salary Requirement for One-Time Bonus Base Salary Requirement for One-Time Bonus Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Entity central index key Entity Central Index Key Restructuring Restructuring and Related Activities Disclosure [Text Block] Line of credit facility, current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Prepaid software maintenance and subscriptions, current portion Prepaid Software Maintenance and Subscriptions, Current Amount of asset related to consideration paid in advance for software maintenance and subscriptions that provides economic benefits within a future period of one year or the normal operating cycle, if longer. Measurement Frequency [Axis] Measurement Frequency [Axis] Acquired software and technology [Member] Computer Software, Intangible Asset [Member] United Kingdom [Member] UNITED KINGDOM Derivative Instrument [Axis] Derivative Instrument [Axis] Capitalized software development costs Payments to Develop Software Credit losses and sales returns Credit Loss, Financial Instrument [Policy Text Block] July 2017 Swap [Member] July 2017 Swap [Member] July 2017 Swap [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Real estate escrow balances Escrow Deposit Standby letters of credit [Member] Standby Letters of Credit [Member] Derivative instruments Derivatives, Policy [Policy Text Block] Purchase of equipment and other assets included in accounts payable Capital Expenditures Incurred but Not yet Paid Geographical [Axis] Geographical [Axis] Change in valuation reserve, amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Segments [Domain] Segments [Domain] June 2019 Swap [Member] June 2019 Swap [Member] June 2019 Swap [Member] EMG [Member] Enterprise Markets Group [Member] Enterprise Markets Group [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Security incident, number of customer claims Security incident, number of customer claims Security incident, number of customer claims Contingencies Commitments and Contingencies, Policy [Policy Text Block] 2024  Long-Term Debt, Maturity, Year Four Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] SEC Schedule, 12-09, Balance at beginning of year SEC Schedule, 12-09, Balance at end of year SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Income Statement Location [Axis] Income Statement Location [Axis] Accounts receivable, allowance Accounts Receivable, Allowance for Credit Loss, Current Entity common stock, shares outstanding Entity Common Stock, Shares Outstanding Section 162(m) limitation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent Income Statement Location [Domain] Income Statement Location [Domain] Short-term debt [Member] Short-term Debt [Member] 2022  Lessee, Operating Lease, Liability, to be Paid, Year Two State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] U.S. Federal Current Federal Tax Expense (Benefit) Derivative, notional amount Derivative, Notional Amount Components of Restricted Cash Schedule Of Restricted Cash [Table Text Block] Schedule Of Restricted Cash Amortization Amortization of Intangible Assets Deferred revenue Deferred Tax Assets, Deferred Income Components of Lease Expense Lease, Cost [Table Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value Grant date fair value of award under share-based payment arrangement. Excludes share and unit options. 2023  Lessee, Operating Lease, Liability, to be Paid, Year Three Legal contingencies Legal Costs, Policy [Policy Text Block] Other assets Less: Long-term portion Other Assets, Noncurrent Other liabilities Other Liabilities Segment Information Segment Reporting Disclosure [Text Block] Federal credits generated Effective Income Tax Rate Reconciliation, Tax Credit, Percent Software development costs, net Capitalized Software Development Costs for Software Sold to Customers Total assets Assets Derivative liabilities, current portion Derivative Liability, Current Unvested, number, beginning of period Unvested, number, end of period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Title of 12(b) security Title of 12(b) Security Catastrophic Event [Axis] Catastrophic Event [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Axis] 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. Total included in cost of revenue [Member] Cost of Sales [Member] Concentration of credit risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Interest expense Interest Expense Change in Accounting Estimate, Workforce Strategy Change in Accounting Estimate, Workforce Strategy [Member] Change in Accounting Estimate, Workforce Strategy 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. Schedule of Components of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Unvested awards, compensation cost not yet recognized, period of recognition (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Other debt Other Long-term Debt Supplemental disclosure of cash flow information Supplemental Cash Flow Elements [Abstract] Other [Member] Other Segments [Member] Other countries [Member] Non-US [Member] Less: Amount representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount November 2020 Swap 4 [Member] November 2020 Swap 4 [Member] November 2020 Swap 4 One-time cash outlay related to real estate activities One-time Cash Outlay Related to Real Estate Activities One-time Cash Outlay Related to Real Estate Activities 2022  Long-Term Debt, Maturity, Year Two Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Operating lease liabilities, net of current portion Operating Lease Liabilities, Net of Current Portion [Member] Operating Lease Liabilities, Net of Current Portion Revenue recognized that was included in deferred revenue at beginning of period Contract with Customer, Liability, Revenue Recognized Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Accrued legal costs Accrued Professional Fees Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Dividends per share (in dollars per share) Dividends paid per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Acquisition-related change Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount November 2020 Swap 3 [Member] November 2020 Swap 3 [Member] November 2020 Swap 3 Additional paid-in capital [Member] Additional Paid-in Capital [Member] Other assets Other Assets Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total amounts reclassified from accumulated other comprehensive loss Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Purchase of treasury shares under stock repurchase program, cost method Treasury stock, value, acquired, cost method Treasury Stock, Value, Acquired, Cost Method Unbilled accounts receivable Unbilled Contracts Receivable Derivative liabilities Derivative Liability Annual dividend per share approved (in dollars per share) Annual Dividend per Share Approved The aggregate dividend for each share of common stock outstanding approved by the board of directors for the current year. Balance (in shares) Balance (in shares) Shares, Issued 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] Software development costs, software to be sold Software to be Sold, Leased, or Otherwise Marketed, Policy [Policy Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Fair value measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 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. Variable lease cost Variable Lease, Cost Provision/adjustment Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) November 2020 Swap 2 [Member] November 2020 Swap 2 [Member] November 2020 Swap 2 Revolving credit loans [Member] Revolving Credit Facility [Member] Research and development Research and Development Expense Impairment of capitalized software dev costs Other Asset Impairment Charges Subsequent Event [Member] Subsequent Event [Member] Operating leases Deferred Tax Assets, Leasing Arrangements Amount of deferred tax assets attributable to taxable temporary differences from leasing arrangements. Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Property and equipment [Member] Property, Plant and Equipment [Member] Domestic Tax Authority [Member] Domestic Tax Authority [Member] Purchase of net assets of acquired companies, net of cash and restricted cash acquired Payments to Acquire Businesses, Net of Cash Acquired Common stock, shares authorized Common Stock, Shares Authorized Property and equipment, gross Property, Plant and Equipment, Gross Stock-based awards Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Proceeds from exercise of stock options Proceeds from Stock Options Exercised U.S. Federal Deferred Federal Income Tax Expense (Benefit) Other income, net Other income, 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). Revenue recognition Revenue [Policy Text Block] Included in operating expenses [Member] Total included in operating expenses [Member] Operating Expense [Member] Impairment charges against certain property and equipment assets Impairment of Long-Lived Assets Held-for-use SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Income Statement [Abstract] Income Statement [Abstract] Accumulated other comprehensive loss [Member] AOCI Attributable to Parent [Member] Third-party technology [Member] Third-party Technology [Member] Technology developed by a third-party used in conjunction with entity's products and services. Federal, state and foreign tax credits Deferred Tax Assets, Tax Credit Carryforwards, State and Foreign Deferred tax assets, tax credit carryforwards, state and foreign. Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent 2024  Finite-Lived Intangible Asset, Expected Amortization, Year Four Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Rent expense under ASC 840 Operating Leases, Rent Expense Global HQ [Member] Global HQ [Member] Global HQ [Member] Exercise of stock options and stock appreciation rights 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. US States [Member] US States [Member] US States Gain (loss) recognized in accumulated other comprehensive loss Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Name of Property [Domain] Name of Property [Domain] Summary of Unvested Restricted Stock Awards, Activity Nonvested Restricted Stock Shares Activity [Table Text Block] Aggregate financing costs related to debt discount and debt issuance costs Less: Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Use of estimates Use of Estimates, Policy [Policy Text Block] Implementation costs for cloud computing arrangements, amortization Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization Amortization of Intangible Assets Acquired by Income Statement Location [Line Items] Amortization Of Intangible Assets Acquired By Income Statement Location [Line Items] Amortization of intangible assets acquired by income statement location [line items]. Current assets: Assets, Current [Abstract] Interest income Investment Income, Interest YourCause [Member] YourCause [Member] YourCause [Member] Income Tax Authority [Domain] Income Tax Authority [Domain] Amortization Amortization Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Marketing assets [Member] Marketing-Related Intangible Assets [Member] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Trade accounts payable Increase (Decrease) in Accounts Payable, Trade Costs of obtaining contracts Capitalized Contract Cost, Net Documents incorporated by reference Documents Incorporated by Reference [Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] 2021  Long-Term Debt, Maturity, Year One SEC Schedule, 12-09, Deduction SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Allowance for credit losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment City area code City Area Code Income Tax Authority [Axis] Income Tax Authority [Axis] Document period end date Document Period End Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] 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. Contract term of recurring revenue contracts at contract inception (years) Contract Term Of Recurring Revenue Contracts At Contract Inception (Years) Contract term of recurring revenue contracts at contract inception (in years). Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Revenue, remaining performance obligation, percentage to be recognized Revenue, Remaining Performance Obligation, Percentage Accrued health care costs Accrued Insurance Allowance for sales returns [Member] Allowance for Returns [Member] A valuation allowance for the amount of products sold that the entity expects to be returned by the purchaser. 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. Basis of Presentation [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Valuation Allowance [Table] Valuation Allowance [Table] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Security deposits Security Deposit Income before provision for income taxes (Loss) income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Impairment of long-lived assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Hedging Designation [Axis] Hedging Designation [Axis] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Operating lease right-of-use assets, impairments Operating Lease, Impairment Loss Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information Disclosure [Abstract] November 2020 Swap 1 [Member] November 2020 Swap 1 [Member] November 2020 Swap 1 Summary of Stock-Based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Employee taxes paid for withheld shares upon equity award settlement Payment, Tax Withholding, Share-based Payment Arrangement Designated as hedging instrument [Member] Designated as Hedging Instrument [Member] Restricted stock grants (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross State credits, net of federal benefit Effective Income Tax Rate Reconciliation, Tax Credits, State and Local Effective income tax rate reconciliation, tax credits, state and local. 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[Member] International Current Foreign Tax Expense (Benefit) Intangible assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Entity registrant name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Total deferred tax liabilities Deferred Tax Liabilities, Gross Advertising costs Advertising Cost [Policy Text Block] 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. 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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. 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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). 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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). 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