Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 35,400	$ 31,807	$ 58,510	$ 51,550
Other comprehensive income (loss), net of tax:
Amortization of loss on cash flow hedge	216	216	431	431
Foreign currency translation adjustment	509	(2,082)	1,030	(2,327)
Other comprehensive income (loss), net of tax	725	(1,866)	1,461	(1,896)
Comprehensive income	$ 36,125	$ 29,941	$ 59,971	$ 49,654