CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 47,904	$ 42,765	$ 94,304	$ 89,142
Other comprehensive income (loss):
Foreign currency translation adjustment	16	0	(32)	0
Comprehensive income	$ 47,920	$ 42,765	$ 94,272	$ 89,142