Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,705	$ (24,022)	$ 28,693	$ (137,307)
Other comprehensive income, net of taxes:
Unrealized appreciation on securities, net of tax of $20, $0, $32, and $0	33	0	53	0
Comprehensive income (loss)	$ 3,738	$ (24,022)	$ 28,746	$ (137,307)