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Derivative Instruments and Hedging Activities (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Foreign Currency Derivative Instruments, Asset at Fair Value $ 82,764 $ 37,034
Foreign Currency Derivative Instruments, Liability at Fair Value $ (66,042) $ (25,891)