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Investments in Affiliates and Related Transactions - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 16, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment |  | $ 44,023 |  | $ 44,023 |  | $ 43,650
Equity method investment, ownership interest |  | 30.00% |  | 30.00% |  |
Equity method investment income |  | $ 233 | $ 0 | $ 981 | $ 0 |
Note receivable from related party |  | $ 82,099 |  | $ 82,099 |  | $ 70,269
STIH |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership interest |  | 70.00% |  | 70.00% |  |
Sequential Technology International, LLC | BPO Divestiture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Duration of customer contract | 3 years |  |  |  |  |
Discontinued Operations, Disposed of by Sale | BPO Divestiture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue from Cloud Telephony and Support services agreement |  |  |  | $ 4,200 |  |
Sequential Technology International Holdings, LLC | Discontinued Operations, Disposed of by Sale | Sequential Technology International, LLC | BPO Divestiture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 11.00% |  | 11.00% |  |
Interest income |  |  |  | $ 5,600 |  |
Indirect Guarantee of Indebtedness | Goldman Sachs Bank USA | Sequential Technology International Holdings, LLC | Discontinued Operations, Disposed of by Sale | Sequential Technology International, LLC | BPO Divestiture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Restricted cash |  | $ 6,200 |  | $ 6,200 |  |

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