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Derivative Financial Instruments (Gains / Losses on Foreign Currency Derivatives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Foreign currency transaction gains (losses) $ (563) $ (1,417) $ 488 $ 1,794
Foreign currency forward exchange contracts gains (losses) 846 1,579 866 (1,356)
Foreign currency gains, net $ 283 $ 162 $ 1,354 $ 438