CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income:	$ 4,188	$ 8,554
Other comprehensive income (loss), net of tax:
Reclassification of realized gain included in earnings	(3,122)	0
Reclassification of other-than-temporary impairment loss included in earnings	366	0
Total before income taxes	1,153	(88)
Income tax (expense) benefit	(441)	34
Total other comprehensive income (loss), net of tax	712	(54)
Total comprehensive income, net of tax	4,900	8,500
Available-for-sale Securities
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on available-for-sale investments	3,905	(88)
Restricted investments
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on available-for-sale investments	$ 4	$ 0