Other Income and Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expense [Abstract]
Interest income	$ (3,785)	$ (3,160)	$ (2,749)
Foreign currency (gain) loss	(5,626)	4,185	2,178
Loss on debt retirement, net	12,330	1,199	15,531
Other income, net	(705)	(1,586)	(1,030)
Total other expense, net	$ 2,214	$ 638	$ 13,930