Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 38,822	$ 21,163	$ 35,813	$ 59,985	$ 57,407
Other comprehensive income (loss), net of tax:
Amortization of loss on cash flow hedge	216		216	431	431
Foreign currency translation adjustment	(629)		175	899	(1,272)
Other comprehensive income (loss), net of tax	(413)		391	1,330	(841)
Comprehensive income	$ 38,409		$ 36,204	$ 61,315	$ 56,566