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Derivative Financial Instruments (Details) - Not Designated as Hedges - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative financial instruments    
Amount of realized net gain (loss) on derivatives $ (546) $ 1,154
Foreign currency exchange forwards    
Derivative financial instruments    
Amount of realized net gain (loss) on derivatives (89) 248
Foreign currency collar    
Derivative financial instruments    
Amount of realized net gain (loss) on derivatives $ (457) $ 906