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Derivative Instruments - Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Details) - Derivatives designated as hedging instruments - Foreign currency forward exchange contracts - Cost of sales - 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 OCI $ 17,652 $ (27,406) $ 12,333 $ (39,990)
Amount of Gain (Loss) Reclassified from Accumulated OCI to Statements of Operations $ (4,786) $ 364 $ (9,217) $ 2,593