Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 9,059	$ (72,136)	$ 24,988	$ (113,285)
Other comprehensive income (loss), net of taxes:
Unrealized appreciation on securities, net of tax of $12, $0, $12, and $0	20	0	20	0
Comprehensive income (loss)	$ 9,079	$ (72,136)	$ 25,008	$ (113,285)