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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		Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		$ 546,186	$ 927,079
Liabilities		1,538,917	1,280,362
Accounts Payable And Accrued Expenses [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		230,999	221,095
Funds Payable To Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		525,089	583,107
Salaries And Social Security Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		36,594	46,828
Taxes Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		22,740	32,150
Dividends Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities			6,624
Loans Payable And Other Financial Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	[1]	696,332	368,414
Other Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		27,163	22,144
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		546,186	927,079
Liabilities		1,538,917	1,291,448
Significant Other Observable Inputs (Level 2) [Member] | Accounts Payable And Accrued Expenses [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		230,999	221,095
Significant Other Observable Inputs (Level 2) [Member] | Funds Payable To Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		525,089	583,107
Significant Other Observable Inputs (Level 2) [Member] | Salaries And Social Security Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		36,594	46,828
Significant Other Observable Inputs (Level 2) [Member] | Taxes Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		22,740	32,150
Significant Other Observable Inputs (Level 2) [Member] | Dividends Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities			6,624
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	[1]	696,332	379,500
Significant Other Observable Inputs (Level 2) [Member] | Other Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		27,163	22,144
Time Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		66,980	202,820
Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		66,980	202,820
Accounts Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		27,141	28,168
Accounts Receivable [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		27,141	28,168
Credit Card Receivables [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		266,461	521,130
Credit Card Receivables [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		266,461	521,130
Loans Receivable, Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		90,827	73,409
Loans Receivable, Net [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		90,827	73,409
Other Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		94,777	101,552
Other Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets		$ 94,777	$ 101,552
[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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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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