Derivative Instruments and Hedging Activities (Details) (Foreign Exchange Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ 1,758	$ 2,452	$ (2,067)	$ (5,614)
Interest expense [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	(1,275)	(2,027)	(2,666)	(3,876)
Foreign exchange gain (loss), net [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ 3,033	$ 4,479	$ 599	$ (1,738)