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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in OCI $ 12,996   $ 22,068  
Amount of Gain Reclassified from Accumulated OCI to Statement of Operations $ 6,394 $ (800) $ 9,645 $ (10,000)
Amount of Gain Recognized in OCI   3,215   15,548
Amount of (Loss) Reclassified from Accumulated OCI to Statement of Operations   $ (787)   $ (10,004)