CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 31,695	$ 15,497	$ 13,147
Other comprehensive income (loss), net of tax
Unrealized losses on investments	(86)	(8)	(9)
Unrealized gains on interest rate cap	0	0	66
Foreign currency translation adjustments	(321)	(115)	(53)
Total other comprehensive income (loss), net of tax	(407)	(123)	4
Comprehensive income	$ 31,288	$ 15,374	$ 13,151