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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
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]  
Balance at December 31, 2017 $ 34,338
(Loss) Gain included in earnings:  
Unrealized losses, net (37,611)
Realized gains, net 129,723
Included in other comprehensive income 11,776
Settlements (3,520)
Reclassification upon conversion of Series A Preferred Stock (140,320)
Currency translation adjustment and other (997)
Balance at September 30, 2018 (6,611)
Unrealized loss, net, relating to derivatives held at September 30, 2018 $ (37,611)