Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 24,595	$ 14,065	$ 14,053
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments gains / (losses)	561	(509)	1,404
Change in deferred gains (losses) on cash flow hedges	77	568	195
Defined benefit pension plan adjustments	(1,409)	(3,331)	278
Total other comprehensive income (loss), net of tax	(771)	(3,272)	1,877
Comprehensive income	$ 23,824	$ 10,793	$ 15,930