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Derivative Financial Instruments - Income Statement Location and Impact of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Not Designated as Hedging Instrument | Foreign exchange contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Currency exchange losses (gains), net $ 587 $ (5,014)