Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 25,128	$ 29,578	$ 77,053	$ 73,389
Other comprehensive income (loss)
Foreign currency translation adjustments	902	(1,964)	1,268	(1,240)
Other comprehensive income (loss)	902	(1,964)	1,268	(1,240)
Comprehensive income	$ 26,030	$ 27,614	$ 78,321	$ 72,149