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Derivative Financial Instruments (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Foreign Currency Derivatives [Abstract]    
Foreign currency forward contract derivatives $ (1,313) $ (406)
Level 2    
Foreign Currency Derivatives [Abstract]    
Derivative asset 943 1,241
Derivative liability (2,256) (1,647)
Foreign currency forward contract derivatives $ (1,313) $ (406)