Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income	$ 32,895	$ 25,531	$ 17,503
Foreign currency translation adjustments	6,119	1,674	4,462
Derivatives net of taxes	0	0	(144)
Actuarial (loss) gain on defined benefit pension plan, net of taxes	(7,750)	(7,297)	(2,785)
Accumulated other comprehensive income (loss)	$ (1,631)	$ (5,623)	$ 1,533