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INCOME TAXES (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2018	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 08, 2020
Deferred:
Federal				$ 95,791				$ (95,791)
Total deferred income tax benefit (provision)				95,791				(95,791)
Total income tax benefit (provision)		$ (95,800)		95,791		$ 0		$ (95,791)
Differences between the actual income tax benefit (provision) and the expected income tax benefit (provision)
Federal statutory rate (as a percent)	21.00%		21.00%		21.00%	21.00%		21.00%
Expected tax benefit (provision)			$ 2,196	262,888		$ 48,238		$ (29,767)
Stock-based compensation				(6,093)				(350)
Capital loss				(271,248)
Increase (reduction) in deferred tax asset				(9,287)				(201,903)
Change in valuation allowance and related items			(1,506)	(186,851)		(10,849)		136,432
Attribute reduction				(229,385)		(37,985)
Permanent adjustments			(690)	(7,241)		577		(203)
Other				512		19
Total income tax benefit (provision)		$ (95,800)		$ 95,791		0		$ (95,791)
Deferred noncurrent income tax assets:
Net operating loss carry-forwards			46,382			94,742	$ 46,382
Net operating loss limitation under IRC Section 382						451,000
Built in loss adjustment Section 382			142,285			98,416	142,285
Capital loss carryforward			74,848			74,848	74,848
Stock-based compensation expense						1,448
Asset retirement obligations			2,224			2,347	2,224
Book-tax differences in property basis			200,478			199,170	200,478
Unrealized hedging transactions			1,618			2,908	1,618
Disallowed interest Section 163(j)			7,722			13,579	7,722
Basis difference in debt			2,142			1,687	2,142
Operating lease liability			666			85	666
Other			991			374	991
Gross deferred noncurrent income tax assets			479,356			489,604	479,356
Valuation allowance			(478,690)			(489,539)	(478,690)
Deferred noncurrent income tax assets			666			65	666
Deferred noncurrent income tax liabilities:
Lease right of use			(666)			(65)	(666)
Deferred noncurrent income tax liabilities			666			65	666
Net noncurrent deferred income tax assets (liabilities)			$ 0			$ 0	$ 0
Market value of equity upon emergence from bankruptcy									$ 524,800
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor		Successor	Predecessor	Predecessor	Successor	Successor	Predecessor

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