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Derivative Financial Instruments - Balance Sheet Location and Fair Value of Assets Associated with Derivative Financial Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Foreign exchange contracts: other current liabilities $ 559 $ 12
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Foreign exchange contracts: other current assets $ 29 $ 488