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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
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain Recognized in the Statements of Operations $ 14,688 $ 25,955
Foreign currency forward exchange contracts | Other non-operating income/expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain Recognized in the Statements of Operations 14,688 25,569
Foreign currency forward exchange contracts | Cost of sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain Recognized in the Statements of Operations $ 0 $ 386