Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 18,760	$ 18,742	$ 51,799	$ 48,839
Foreign currency translation adjustments	2,806	91	(7,513)	(3,831)
Comprehensive income	$ 21,566	$ 18,833	$ 44,286	$ 45,008