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Derivative Financial Instruments (Details 2) - Foreign exchange contracts - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Other Current Assets    
Derivatives [Line Items]    
Carrying amount of derivative asset $ 3,853 $ 2,369
Other Current Liabilities    
Derivatives [Line Items]    
Carrying amount of derivative liability $ 1,768 $ 75