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Derivative Instruments - Not Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Details) - Derivatives not designated as hedging instruments - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) Gain Recognized in the Statements of Operations $ (2,317) $ 13,633 $ (19,429) $ 65,093
Foreign currency forward exchange contracts | Other non-operating expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) Gain Recognized in the Statements of Operations (2,332) 13,624 (19,196) 64,582
Foreign currency forward exchange contracts | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) Gain Recognized in the Statements of Operations $ 15 $ 9 $ (233) $ 511