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Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
--- | --- | --- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |  |  |
Accrued compensation and benefits | $ 22,679 | $ 33,771 |  |  |
Accrued accounting fees | 19,822 | 3,154 |  |  |
Accrued consulting fees | 6,200 | 13,951 |  |  |
Accrued legal fees | 5,513 | 3,172 |  |  |
Accrued telecommunications | 3,028 | 2,628 |  |  |
Accrued income taxes payable | 2,810 | 4,643 |  |  |
Accrued other | 12,687 | 15,563 |  |  |
Total | $ 72,739 | $ 76,882 | $ 58,531 | $ 67,619 | $ 77,242

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