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Legal Proceedings and Contingencies - Regulatory Actions (Details) - USD ($) | Jan. 13, 2016 | Jun. 30, 2018 | Dec. 31, 2015
--- | --- | --- | ---
Indemnification clauses |  |  |
Contingencies |  |  |
Liabilities accrued |  | $ 0 |
Office of Foreign Assets Control [Member] |  |  |
Contingencies |  |  |
Liabilities accrued |  |  | $ 900,000
Transaction period under review | 5 years |  |
Range of potential penalties assessed |  |  | $ 0

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