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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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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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-Topic 820
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-Section 50
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