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Accounting Policies [Text Block] Schedule of Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Basic (in shares) Weighted average common shares outstanding; basic (in shares) Weighted average common shares outstanding; basic (in shares) Weighted Average Number of Shares Outstanding, Basic Share repurchase program, remaining authorized amount Share Repurchase Program, Remaining Authorized, Amount Cost of revenue (exclusive of depreciation and amortization) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Subsequent Events [Abstract] Capitalized contract cost, impairment loss Capitalized Contract Cost, Impairment Loss Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Deferred costs, noncurrent Capitalized Contract Cost, Net, Noncurrent Costs and operating expenses: Costs and Expenses [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Schedule of Weighted Average Number of Shares Schedule of Weighted Average Number of Shares [Table Text Block] Income tax receivable Income Taxes Receivable, Current Use of Estimates Use of Estimates, Policy [Policy Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Upward adjustments of non-marketable equity investments Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Subsequent Event Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Capitalized software development costs, net Capitalized Computer Software, Net Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Investment securities—current Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Prepaid expenses Prepaid Expense, Current Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Total other current liabilities Other Liabilities, Current Other Other Sundry Liabilities, Current Share Repurchase Program [Abstract] Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation