CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income:	$ 10,614	$ 1,580	$ 14,802	$ 10,132
Other comprehensive (loss) income, net of tax:
Reclassification of realized gain included in earnings	(7,739)	0	(10,861)	0
Reclassification of other-than-temporary impairment loss included in earnings	0	0	366	0
Total before income taxes	(6,998)	90	(5,845)	2
Income tax benefit (expense)	2,835	(35)	2,394	(1)
Total other comprehensive income (loss), net of tax	(4,163)	55	(3,451)	1
Total comprehensive income, net of tax	6,451	1,635	11,351	10,133
Available-for-sale investments
Other comprehensive (loss) income, net of tax:
Net unrealized gain (loss) on investments	745	90	4,650	2
Restricted investments
Other comprehensive (loss) income, net of tax:
Net unrealized gain (loss) on investments	$ (4)	$ 0	$ 0	$ 0