Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ (29,584)	$ (95,191)	$ (9,531)
State	4,320	6,682	1,816
Total	(25,264)	(88,509)	(7,715)
Deferred
Federal	233,136	230,643	(313,938)
State	11,282	(1,040)	(7,175)
Total	244,418	229,603	(321,113)
Income tax expense (benefit)	$ 219,154	$ 141,094	$ (328,828)