CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss):	$ 8,554	$ (1,716)
Other comprehensive (loss) income, net of tax:
Net unrealized (loss) gains on available-for-sale investments	(88)	1,257
Total before income taxes	(88)	1,257
Income tax benefit (expense)	34	(484)
Total	(54)	773
Total other comprehensive (loss) income, net of tax	(54)	773
Total comprehensive income (loss), net of tax	$ 8,500	$ (943)