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Investments in Affiliates and Related Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investment		$ 33,917	$ 43,650
Equity method investment, ownership interest		30.00%
Equity method investment loss		$ 9,125	0	$ 0
Note receivable from related party, net of allowance for loan losses of $14,562 at December 31, 2017	[1]	73,984	70,269
Thomas Sharkey Jr
Schedule of Equity Method Investments [Line Items]
Related party transaction amount		$ 100	400	$ 500
STIH
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest		70.00%
BPO | STIN
Schedule of Equity Method Investments [Line Items]
Duration of customer contracts (in years)		3 years
Discontinued Operations, Disposed of by Sale | BPO
Schedule of Equity Method Investments [Line Items]
Related party revenue		$ 26,000	$ 1,200
Discontinued Operations, Disposed of by Sale | BPO | STIN | STIH
Schedule of Equity Method Investments [Line Items]
Interest income from related party		$ 12,100
Indirect Guarantee of Indebtedness | Goldman Sachs Bank USA | Discontinued Operations, Disposed of by Sale | BPO | STIN | STIH
Schedule of Equity Method Investments [Line Items]
Restricted cash, current					$ 6,200
[1] See Note 6 -Investments in Affiliates and Related Transactions for related party transactions reflected in this account

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