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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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