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Disposition (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 16, 2015
Business Acquisition [Line Items] |  |  |  |  |
Gain on sale |  |  | $ 30,954 | $ 0 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Accretion of interest |  |  | 742 | 4,162 |
Three Q Digital Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration potential payment |  |  |  |  | $ 35,000
Contingent consideration | Significant Unobservable Inputs (Level 3) | Three Q Digital Inc |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance at December 31, 2017 |  | $ 33,887 | 33,887 |  |
Accretion of interest |  |  | 742 |  |
Disposition |  |  | (34,629) |  |
Ending balance at December 31, 2018 |  |  | $ 0 | $ 33,887 |
3Q Digital Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from sale | $ 5,000 |  |  |  |
Additional proceeds for sale of business | $ 5,000 |  |  |  |
Percent of total Company revenue (less than) |  |  |  | 10.00% |
Gain on sale |  | $ (31,000) |  |  |

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