Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,538	$ 3,316	$ 8,321	$ 6,318
Available-for-sale investments:
Change in net unrealized gain (loss) on investments, net of tax	80	(8)	273	16
Less: reclassification adjustment for net realized gain (loss) included in net income	2	0	50	1
Net change, net of tax	82	(8)	323	17
Other comprehensive income (loss), net	82	(8)	323	17
Comprehensive income	$ 3,620	$ 3,308	$ 8,644	$ 6,335