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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
(Losses) Gains on Foreign Currency Forward Contracts $ 317 $ 50 $ 202 $ (98)