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Derivative Instruments and Hedging Activities (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Foreign Currency Derivative Instruments, Asset at Fair Value $ 38,182 $ 44,637
Foreign Currency Derivative Instruments, Liability at Fair Value $ (25,577) $ (36,102)