CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 3,097	$ 725	$ 17,600	$ 8,486
Other comprehensive income (loss), net of tax
Unrealized gains on investments	11	(10)	48	10
Foreign currency translation adjustments	(130)	(63)	(239)	(62)
Total other comprehensive loss, net of tax	(119)	(73)	(191)	(52)
Comprehensive income	$ 2,978	$ 652	$ 17,409	$ 8,434