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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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Transaction period under review for potential regulatory infractions.

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