CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - 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 (loss):	$ 1,580	$ (271)	$ 10,132	$ (1,986)
Other comprehensive income, net of tax:
Net unrealized gains on available-for-sale investments	90	1,989	2	3,246
Total before income taxes	90	1,989	2	3,246
Income tax expense	(35)	(789)	(1)	(1,273)
Total	55	1,200	1	1,973
Total other comprehensive income, net of tax	55	1,200	1	1,973
Total comprehensive income (loss), net of tax	$ 1,635	$ 929	$ 10,133	$ (13)