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Derivative Financial Instruments - Income Statement Location and Impact of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Currency exchange (gains) losses, net $ 4,647 $ 1,202