Derivative Financial Instruments (Fair Value of Derivative Assets and Liabilities) (Details) - Level 2 - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Foreign Currency Derivatives [Abstract]
Derivative asset, gross forward foreign currency exchange contracts	$ 1,173	$ 943
Derivative asset, netting of counterparty contracts	(1,123)	(943)
Derivative asset, net foreign currency forward contract derivatives	50
Derivative liability, gross forward foreign currency exchange contracts	(1,123)	(2,256)
Derivative liability, netting of counterparty contracts	$ 1,123	943
Derivative liability, net foreign currency forward contract derivatives		$ (1,313)