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Derivative Instruments and Hedging Activities (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Foreign exchange contracts | (Gain) loss on foreign currency | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value [Line Items]      
(Gain) loss on foreign currency $ (15,969) $ 25,339 $ 5,909