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Derivative Financial Instruments (Details) - Not Designated as Hedges - Foreign currency exchange forwards - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Derivative Financial Instruments          
Fair Value $ 23   $ 23    
Notional Amounts 4,810   4,810   $ 622
Gains (losses) 199   216    
Weighted average notional amount $ 5,376 $ 273 $ 2,392 $ 273