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	$ 103,034	$ 102,757	$ 80,039
Other comprehensive income (loss)
Foreign currency translation adjustments	1,014	(1,750)	2,136
Other comprehensive income (loss)	1,014	(1,750)	2,136
Comprehensive income	$ 104,048	$ 101,007	$ 82,175