Income Taxes - Components of the Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal:
Current									$ 0	$ 0	$ (44)
Deferred									58,310	101,023	(423)
Total federal									58,310	101,023	(467)
State, net of federal benefit:
Deferred									3,127	4,452	6,175
Total state									3,127	4,452	6,175
Income tax expense	$ 1,649	$ 34,953	$ 32,625	$ (7,790)	$ 16,453	$ 32,454	$ 33,243	$ 23,325	$ 61,437	$ 105,475	$ 5,708