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, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal								$ 5,000
Total current income tax benefit (provision)								5,000
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)	$ 5,000
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%	35.00%
Expected tax benefit (provision)			$ 2,196	262,888			$ (29,767)	$ (185,740)
State income tax expense, net of federal benefit								(2,587)
Stock-based compensation				(6,093)			(350)
Change in state rate								(10,121)
Capital loss				(271,248)
Increase (reduction) in deferred tax asset				(9,287)			(201,903)	95,907
Change in valuation allowance and related items			(1,506)	(186,851)			136,432	392,846
Attribute reduction				(229,385)
Tax Cuts and Jobs Act of 2017								(280,874)
Permanent adjustments			(690)	(7,241)			(203)
Other				512				(4,431)
Total income tax benefit (provision)		(95,800)		$ 95,791		0	(95,791)	$ 5,000
Deferred noncurrent income tax assets:
Net operating loss carry-forwards		204,751	46,382			46,382	204,751
Net operating loss limitation under IRC Section 382						220,000
Built in loss adjustment Section 382		88,835	142,285			142,285	88,835
Capital loss carryforward			74,848			74,848
Stock-based compensation expense		8,509					8,509
Asset retirement obligations		1,011	2,224			2,224	1,011
Book-tax differences in property basis			200,478			200,478
Unrealized hedging transactions			1,618			1,618
Disallowed interest Section 163(j)		3,370	7,722			7,722	3,370
Basis difference in debt			2,142			2,142
Operating lease liability			666			666
Other		1,917	991			991	1,917
Gross deferred noncurrent income tax assets		308,393	479,356			479,356	308,393
Valuation allowance		(290,333)	(478,690)			(478,690)	(290,333)
Deferred noncurrent income tax assets		18,060	666			666	18,060
Deferred noncurrent income tax liabilities:
Basis difference in debt		(5,507)					(5,507)
Book-tax differences in property basis		(96,414)					(96,414)
Unrealized hedging transactions		(11,930)					(11,930)
Net current deferred income tax assets (liabilities)		(113,851)	(666)			(666)	(113,851)
Net current deferred income tax assets (liabilities)		$ (95,791)					$ (95,791)
Market value of equity upon emergence from bankruptcy			$ 524,800			$ 524,800
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor		Successor	Predecessor	Predecessor		Predecessor	Predecessor