Derivative Instruments and Hedging Activities (Details) (Foreign Exchange Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
(Loss) gain recognized on non-designated derivative instruments:
(Loss) gain recognized on non-designated derivative instruments, total	$ (1,178)	$ 7,741	$ (1,378)	$ 8,328
Interest expense [Member]
(Loss) gain recognized on non-designated derivative instruments:
(Loss) gain recognized on non-designated derivative instruments, total	(1,538)	(1,812)	(2,969)	(2,627)
Foreign exchange gain (loss), net [Member]
(Loss) gain recognized on non-designated derivative instruments:
(Loss) gain recognized on non-designated derivative instruments, total	$ 360	$ 9,553	$ 1,591	$ 10,955