Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 2,768	$ 78,806	$ 107,818
State	(1,677)	1,706	11,247
Foreign	32	89	0
Total	1,123	80,601	119,065
Deferred
Federal	(40,345)	(105,006)	(26,377)
State	(2,093)	(9,785)	(4,325)
Foreign	5,042	(458)	(1,306)
Total	(37,396)	(115,249)	(32,008)
Total
Federal	(37,577)	(26,200)	81,441
State	(3,770)	(8,079)	6,922
Foreign	5,074	(369)	(1,306)
Income tax (benefit) provision	$ (36,273)	$ (34,648)	$ 87,057