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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Financial Instruments [Abstract]        
Gains on Foreign Currency Forward Contracts $ 502 $ 179 $ 2,997 $ 54