Derivative Financial Instruments (Fair Value of Derivative Assets and Liabilities) (Details) - Level 2 - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Foreign Currency Derivatives [Abstract]
Derivative asset, gross forward foreign currency exchange contracts	$ 862	$ 943
Derivative asset, netting of counterparty contracts	(862)	(943)
Derivative asset, net foreign currency forward contract derivatives	0	0
Derivative liability, gross forward foreign currency exchange contracts	(1,371)	(2,256)
Derivative liability, netting of counterparty contracts	862	943
Derivative liability, net foreign currency forward contract derivatives	$ (509)	$ (1,313)