Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Income (Expense) [Abstract]
Foreign exchange gain (loss)	$ (8,249)	$ (2,792)	$ 5,039
Interest income	10,386	2,888	3,917
Loss on early extinguishment of debt	0	(1,659)	0
Sale of investments	1,396	0	0
Other	259	194	835
Other Income (expense)	$ 3,792	$ (1,369)	$ 9,791