Derivative Financial Instruments (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Foreign Currency Derivatives [Abstract]
Derivative asset	$ 2,116	$ 6,541
Derivative liability	(3,410)	(6,698)
Forward foreign currency contract derivative liabilities	(1,294)	(157)
Level 1 [Member]
Foreign Currency Derivatives [Abstract]
Derivative asset	0	0
Derivative liability	0	0
Level 2 [Member]
Foreign Currency Derivatives [Abstract]
Derivative asset	2,116	6,541
Derivative liability	(3,410)	(6,698)
Level 3 [Member]
Foreign Currency Derivatives [Abstract]
Derivative asset	0	0
Derivative liability	$ 0	$ 0