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Value, Restricted Stock Award, Net of Forfeitures Weighted-average shares - basic (in shares) Weighted-average number of shares of common stock - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Cost of revenue (excluding depreciation & amortization) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other (expense) income: Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Provision for credit losses Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Outstanding, beginning of period (in dollars per share) Outstanding, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Award earned percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Award Earned Percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Award Earned Percentage Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Other comprehensive loss: Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosure [Abstract] Outstanding borrowings Line of Credit Facility, Fair Value of Amount Outstanding Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Net increase in finance receivables Payments to Acquire Finance Receivables Total liabilities Liabilities Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Capitalized software (net of amortization of $84,354 and $67,874) Capitalized Computer Software, Net Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Marketplace operations Marketplace Operations Expense Marketplace Operations Expense Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Counterparty Name [Axis] Counterparty Name [Axis] Share-Based Payment Arrangement, Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] 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 (decrease) increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Interest income Interest Income Interest income.