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Fair Value Measurement - Change in Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - Level 3
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]  
Balance at December 31, 2018 $ (7,418)
Gain (Loss) included in earnings:  
Unrealized gains, net 6,576
Realized losses, net (1,393)
Included in other comprehensive income 2,609
Settlements 8,233
Currency translation adjustment and other 144
Balance at March 31, 2019 $ 8,751