Derivative Instruments and Hedging Activities (Details) (Foreign Exchange Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ (4,229)	$ 10,219	$ (6,296)	$ 4,605
Interest expense [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	(1,121)	(1,920)	(3,787)	(5,796)
Foreign exchange gain (loss), net [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ (3,108)	$ 12,139	$ (2,509)	$ 10,401