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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in the Statements of Operations $ (31,800) $ 25,505 $ (17,112) $ 51,460
Foreign currency forward exchange contracts | Other non-operating income/expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in the Statements of Operations (31,552) 25,389 (16,864) 50,958
Foreign currency forward exchange contracts | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in the Statements of Operations $ (248) $ 116 $ (248) $ 502