Income Taxes - Schedule of Reconciliation of Income Tax Expense to Amount Computed at the Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ (335,469)	$ (646,261)	$ 69,515
Federal tax law change	0	5,288	(1,205,140)
State income taxes	(119,659)	(251,780)	(57,414)
Valuation allowance	70,875	88,785	10,680
Regulatory liability/asset	0	(276)	10,488
Federal tax credits	(7,908)	(2,400)	(34,956)
Goodwill impairment	0	111,470	0
Other	16,385	(1,337)	18,411
Total income tax benefit	$ (375,776)	$ (696,511)	$ (1,188,416)
Effective tax rate	23.50%	22.60%	(598.40%)