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OIL AND NATURAL GAS PROPERTIES (Details) $ in Thousands			3 Months Ended							9 Months Ended		12 Months Ended
	Oct. 01, 2019 USD ($)	Jul. 10, 2017 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Oct. 01, 2019 USD ($)	Sep. 30, 2019	Dec. 31, 2020 USD ($) $ / MMBTU $ / bbl	Dec. 31, 2019 USD ($) $ / MMBTU $ / bbl	Dec. 31, 2018 USD ($) $ / MMBTU $ / bbl	Dec. 31, 2017 USD ($)	Oct. 02, 2019 USD ($)
Oil and Natural Gas Properties
Subject to depletion	$ 2,155,288		$ 509,274			$ 420,609				$ 2,155,288		$ 509,274	$ 420,609			$ 380,364
Other capital costs:
Incurred in 2020			983									983
Incurred in 2019			74,511			105,009						74,511	105,009
Total not subject to depletion	438,365		75,494			105,009				438,365		75,494	105,009			108,954
Gross oil and natural gas properties	2,593,653		584,768			525,618				2,593,653		584,768	525,618			489,318
Less accumulated depletion	(1,709,719)		(295,163)			(19,474)				(1,709,719)		(295,163)	(19,474)
Net oil and natural gas properties	883,934		289,605			506,144				883,934		289,605	506,144			$ 489,318
Ceiling Limitation Disclosures
Depletion expense	84,600		60,500			$ 19,500				84,600		$ 60,500	$ 19,500
Oil And Natural Gas, Evaluated Properties, Fair Value Disclosure	380,400									380,400
Oil And Natural Gas, Unevaluated Properties, Fair Value Disclosure	$ 109,000									109,000
First day average of the (WTI) crude oil spot price (in dollars per barrel) | $ / bbl												39.54	55.85	65.56
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU												1.990	2.580	3.100
Gain (loss) from sale of other operating property and equipment														$ (7,235)
Full cost ceiling impairment			$ 26,700	$ 128,300	$ 60,100		$ 45,600	$ 664,400	$ 275,200	$ 985,190		$ 215,145
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor					Successor				Predecessor	Predecessor	Successor	Successor	Predecessor
Williston Basin Assets
Ceiling Limitation Disclosures
Gain (loss) from sale of other operating property and equipment		$ 0												$ (7,200)	$ 485,900
Unevaluated Oil and Gas Leaseholds
Ceiling Limitation Disclosures
Unevaluated property cost of area transferred to full cost pool				$ 23,600
Hackberry Draw Area [Member] | Unevaluated Oil and Gas Leaseholds
Ceiling Limitation Disclosures
Unevaluated property cost of area transferred to full cost pool								$ 481,700	$ 51,000

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