ESTIMATED PROVED OIL, NATURAL GAS AND NATURAL GAS LIQUIDS RESERVES (UNAUDITED) (Changes in Estimated Proved and Estimated Proved Developed Reserves) (Details)		5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 04, 2018 Bcfe	May 31, 2018 Mcfe Mcf MBbls	Dec. 31, 2018 Mcfe Mcf MBbls	Dec. 31, 2019 Bcfe Mcfe Mcf MBbls	Dec. 31, 2018 Bcfe Mcfe Mcf MBbls	Dec. 31, 2017 Bcfe Mcfe Mcf MBbls	Dec. 31, 2016 Mcfe Mcf MBbls
Reserve Quantities [Line Items]
Financial Designation, Predecessor and Successor [Fixed List]		Predecessor	Successor	Successor	Successor	Predecessor	Predecessor
Proved developed and undeveloped reserves, beginning balance, energy | Mcfe		813,627		711,870	813,627	851,219
Revisions of previous estimates, energy | Mcfe				(46,314)	62,600	7,867
Purchase of minerals in place, energy | Mcfe						16,444
Extensions and discoveries, energy | Mcfe				20	4,859	6,053
Production, energy | Mcfe				(36,479)	(62,222)	(62,293)
Sales of minerals in place, energy | Mcfe				(473,313)	(106,994)	(5,663)
Proved developed and undeveloped reserves, ending balance, energy | Mcfe			711,870	155,784	711,870	813,627	851,219
Proved developed reserves (energy) | Mcfe			698,445	155,784	698,445	813,627	764,149
Proved undeveloped reserves (energy) | Mcfe			13,425		13,425		87,070
Proved undeveloped reserves
Reserve Quantities [Line Items]
Increase (decrease) in oil and natural gas reserves | Bcfe						(85.0)
Oil
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance		13,393		9,913	13,393	12,592
Revisions of previous estimates				(568)	4,640	1,141
Purchases of minerals in place						1,228
Extensions and discoveries				1	7	105
Production				(591)	(1,304)	(1,387)
Sales of minerals in place				(3,212)	(6,823)	(286)
Proved developed and undeveloped reserves, ending balance			9,913	5,543	9,913	13,393	12,592
Proved developed reserves (volume)			9,881	5,543	9,881	13,393	11,954
Proved undeveloped reserve (volume)			32		32		638
Natural Gas
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance | Mcf		543,706		476,688	543,706	575,298
Revisions of previous estimates | Mcf				(35,076)	7,641	3,558
Purchases of minerals in place | Mcf						6,578
Extensions and discoveries | Mcf				8	4,192	3,035
Production | Mcf				(25,470)	(40,066)	(40,979)
Sales of minerals in place | Mcf				(298,114)	(38,785)	(3,784)
Proved developed and undeveloped reserves, ending balance | Mcf			476,688	118,036	476,688	543,706	575,298
Proved developed reserves (volume) | Mcf			468,510	118,036	468,510	543,706	523,113
Proved undeveloped reserve (volume) | Mcf			8,178		8,178		52,185
Natural Gas Liquids
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance		31,594		29,284	31,594	33,395
Revisions of previous estimates				(1,305)	4,518	(422)
Purchases of minerals in place						415
Extensions and discoveries				1	104	398
Production				(1,244)	(2,388)	(2,165)
Sales of minerals in place				(25,988)	(4,544)	(27)
Proved developed and undeveloped reserves, ending balance			29,284	748	29,284	31,594	33,395
Proved developed reserves (volume)			28,442	748	28,442	31,594	28,218
Proved undeveloped reserve (volume)			842		842		5,177
Appalachian Basin and San Juan Basin [Member]
Reserve Quantities [Line Items]
Increase (decrease) in oil and natural gas reserves | Bcfe					(20.8)
Mid Continent Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe				(27.3)	0.8
Volume produced from oil drilling success | Bcfe						1.5
Permian Basin Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe				(21.5)
Central Texas Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe					(106.1)	0.6
Monroe Field Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe				(19.4)
Barnette Shale Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe				(250.6)
Volume produced from oil drilling success | Bcfe					4.8	4.2
Appalachain Basin Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe						(4.6)
San Juan Property [Member]
Reserve Quantities [Line Items]
Sales of minerals in place, energy | Bcfe				(154.3)		0.5
SEC Pricing [Member]
Reserve Quantities [Line Items]
Increase (decrease) in oil and natural gas reserves | Bcfe	66.7			(49.0)	24.3	81.8
Other Various Revisions Aggregated [Member]
Reserve Quantities [Line Items]
Increase (decrease) in oil and natural gas reserves | Bcfe				2.7	(7.6)	11.0
Maximum | Appalachain Basin Property [Member]
Reserve Quantities [Line Items]
Volume produced from oil drilling success | Bcfe				0.100