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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in the Statements of Operations $ 4,366 $ (31,800) $ 3,868 $ (17,112)
Foreign currency forward exchange contracts | Other non-operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in the Statements of Operations 4,366 (31,552) 3,868 (16,864)
Foreign currency forward exchange contracts | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in the Statements of Operations $ 0 $ (248) $ 0 $ (248)