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Derivative Financial Instruments (Details) - Not Designated as Hedges - Foreign currency exchange forwards - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivative Financial Instruments          
Fair Value $ (2)   $ (2)    
Notional Amounts 4,584   4,584   $ 622
Gains (losses) 132 $ (10) 348 $ (9)  
Weighted average notional amount $ 4,448 $ 361 $ 2,869 $ 317