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Derivative Financial Instruments (Details) - Not Designated as Hedges - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Derivative Financial Instruments    
Gain and (losses) from currency exchange derivatives $ 219 $ (546)
Foreign currency exchange forwards    
Derivative Financial Instruments    
Gain and (losses) from currency exchange derivatives $ 219 (89)
Foreign currency collar    
Derivative Financial Instruments    
Gain and (losses) from currency exchange derivatives   $ (457)