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Income Taxes - Summary of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amount
Computed expected federal income tax	$ (230,860)	$ (65,546)	$ 11,341
State income tax, net of federal income tax benefit	(10,888)	(3,152)	903
Deferred tax adjustment related to change in overall state tax rate	(663)	2,822	(86,956)
Valuation allowance	221	187	3,977
Uncertain tax positions	0	0	(1,974)
Provision to return adjustments	(121)	(6,326)	(791)
Other, net	(164)	(1,367)	1,433
Income tax (benefit) expense	$ (242,475)	$ (73,382)	$ (72,067)
Rate
Statutory federal income tax rate (as a percent)	35.00%	35.00%	35.00%
State income tax, net of federal income tax benefit (as a percent)	1.65%	1.68%	2.79%
Deferred tax adjustment related to change in overall state tax rate (as a percent)	0.10%	(1.51%)	(268.36%)
Valuation allowance (as a percent)	(0.03%)	(0.10%)	12.27%
Uncertain tax positions (as a percent)	0.00%	0.00%	(6.09%)
Provision to return adjustments (as a percent)	0.02%	3.38%	(2.44%)
Other, net (as a percent)	0.02%	0.73%	4.42%
Income tax benefit (as a percent)	36.76%	39.18%	(222.41%)

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