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Fair Value Measurement of Assets and Liabilities (Fair Value of Financial Assets and Liabilities Measured at Amortized Cost) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | $ 1,197,112 | $ 614,038
Liabilities |  | 2,199,511 | 1,766,399
Accounts Payable And Accrued Expenses [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 314,703 | 266,759
Funds Payable To Customers [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities | [1] | 778,128 | 640,954
Salaries And Social Security Payable [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 52,448 | 40,942
Taxes Payable [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 45,672 | 31,058
Operating Lease Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 161,512 |
Loans Payable And Other Financial Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 782,653 | 735,177
Other Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 64,395 | 51,509
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 1,197,112 | 614,038
Liabilities |  | 2,263,733 | 1,766,399
Significant Other Observable Inputs (Level 2) [Member] | Accounts Payable And Accrued Expenses [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 314,703 | 266,759
Significant Other Observable Inputs (Level 2) [Member] | Funds Payable To Customers [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities | [1] | 778,128 | 640,954
Significant Other Observable Inputs (Level 2) [Member] | Salaries And Social Security Payable [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 52,448 | 40,942
Significant Other Observable Inputs (Level 2) [Member] | Taxes Payable [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 45,672 | 31,058
Significant Other Observable Inputs (Level 2) [Member] | Operating Lease Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 161,512 |
Significant Other Observable Inputs (Level 2) [Member] | Loans Payable And Other Financial Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 846,875 | 735,177
Significant Other Observable Inputs (Level 2) [Member] | Other Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities |  | 64,395 | 51,509
Time Deposits [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 414,777 | 20,056
Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 414,777 | 20,056
Accounts Receivable [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 40,175 | 35,153
Accounts Receivable [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 40,175 | 35,153
Credit Card Receivables [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 433,046 | 360,298
Credit Card Receivables [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 433,046 | 360,298
Loans Receivable, Net [Member] | Accounts Payable And Accrued Expenses [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 192,881 | 95,778
Loans Receivable, Net [Member] | Significant Other Observable Inputs (Level 2) [Member] | Accounts Payable And Accrued Expenses [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 192,881 | 95,778
Other Assets [Member] | Funds Payable To Customers [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | 116,233 | 102,753
Other Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Funds Payable To Customers [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets |  | $ 116,233 | $ 102,753
[1] | The fair value of the 2019 Notes and the 2028 Notes (including the equity component) are disclosed in Note 9.

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