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Legal Proceedings and Contingencies - Regulatory Actions (Details) - USD ($) $ in Thousands | Jan. 13, 2016 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Contingencies |  |  |
Other accrued expenses |  | $ 10,683 | $ 7,746
Indemnification clauses |  |  |
Contingencies |  |  |
Liabilities accrued |  | $ 0 |
Office of Foreign Assets Control [Member] |  |  |
Contingencies |  |  |
Transaction period under review | 5 years |  |

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