Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income (Expense) [Abstract]
Foreign exchange gain (loss)	$ (993)	$ (3,654)	$ (8,249)
Interest income	4,566	7,626	10,386
Sale of investments	0	0	1,396
Other	(1,720)	(532)	259
Other Income (expense)	1,853	3,440	3,792
Gain on sale of ancillary investment			$ 1,396