Derivative Instruments and Hedging Activities (Details) (Foreign Exchange Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ (2,779)	$ (4,229)	$ 5,549	$ (6,296)
Interest expense [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	(2,099)	(1,121)	(4,726)	(3,787)
Foreign exchange gain (loss), net [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ (680)	$ (3,108)	$ 10,275	$ (2,509)