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Income Taxes - Reconciliation of (Benefit) Provision for Income Taxes at Statutory Federal Tax Rate to Company's Actual Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed at federal statutory rate	$ (94,354)	$ (1,921)	$ 13,409
State taxes, net of federal benefit	(20,500)	119	(284)
Non-deductible expenses	137	849	1,711
Stock-based compensation	602	1,874	1,109
Discharge of debt and other reorganization related items	0	206	1,018
Return to provision adjustments	(6,096)	(1,292)	341,681
Impact of legislative changes	0	0	243,801
Release of valuation allowance	0	0	(8,719)
Change in valuation allowance	120,211	132	(602,452)
Other	0	(38)	(23)
Total (benefit) provision	$ 0	$ (71)	$ (8,749)

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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