Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Income (Expense) [Abstract]
Foreign exchange gain (loss)	$ (3,654)	$ (8,249)	$ (2,792)
Interest income	7,626	10,386	2,888
Loss on early extinguishment of debt	0	0	(1,659)
Sale of investments	0	1,396	0
Other	(532)	259	194
Other Income (expense)	$ 3,440	$ 3,792	$ (1,369)