DERIVATIVE AND HEDGING ACTIVITIES - Open Contracts (Details)		3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019 MMBTU $ / MMBTU $ / bbl bbl	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2018 MMBTU $ / MMBTU $ / bbl bbl	Dec. 31, 2017
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Predecessor	Predecessor	Predecessor	Predecessor
July 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					552,000
July 2019 - December 2019 | Collars | Crude oil | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					50.00
Ceilings (in dollars per Mmbtu's/Bbl's)					55.00
July 2019 - December 2019 | Collars | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					55.00
Ceilings (in dollars per Mmbtu's/Bbl's)					69.00
July 2019 - December 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					53.00
Ceilings (in dollars per Mmbtu's/Bbl's)					61.00
July 2019 - December 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					460,000
July 2019 - December 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential					(2.40)
July 2019 - December 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential					(6.50)
July 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential					(5.68)
October 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					92,000
Floors (in dollars per Mmbtu's/Bbl's)					51.00
Ceilings (in dollars per Mmbtu's/Bbl's)					56.00
October 2019 - December 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					51.00
Ceilings (in dollars per Mmbtu's/Bbl's)					56.00
October 2019 - December 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					460,000
October 2019 - December 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential					3.45
October 2019 - December 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential					4.00
October 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential					3.72
October 2019 - December 2019 | Fixed Swap | NGLs
Derivative and hedging activities
Volume in Mmbtu's | MMBTU					92,000
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					32.50
October 2019 - December 2019 | Fixed Swap | NGLs | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					32.50
January 2020 - December 2020 | Fixed Swap | Natural gas | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.55
January 2020 - December 2020 | Fixed Swap | Natural gas | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.57
January 2019 - March 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					90,000
Floors (in dollars per Mmbtu's/Bbl's)					46.75
Ceilings (in dollars per Mmbtu's/Bbl's)					51.75
January 2019 - March 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					46.75
Ceilings (in dollars per Mmbtu's/Bbl's)					51.75
January 2019 - March 2019 | Call option | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					1,350,000
Ceilings (in dollars per Mmbtu's/Bbl's)					62.64
January 2019 - March 2019 | Call option | Crude oil | Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)					62.64
January 2019 - March 2019 | Call option | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					(1,350,000)
Ceilings (in dollars per Mmbtu's/Bbl's)					58.64
January 2019 - March 2019 | Call option | Crude oil | Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)					58.64
January 2019 - June 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					181,000
Floors (in dollars per Mmbtu's/Bbl's)					51.00
Ceilings (in dollars per Mmbtu's/Bbl's)					56.00
January 2019 - June 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					51.00
Ceilings (in dollars per Mmbtu's/Bbl's)					56.00
January 2019 - September 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					546,000
January 2019 - September 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential					(6.20)
January 2019 - September 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential					(7.60)
January 2019 - September 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential					(6.90)
January 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					3,650,000
January 2019 - December 2019 | Collars | Crude oil | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					50.00
Ceilings (in dollars per Mmbtu's/Bbl's)					55.20
January 2019 - December 2019 | Collars | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					58.00
Ceilings (in dollars per Mmbtu's/Bbl's)					63.00
January 2019 - December 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					53.87
Ceilings (in dollars per Mmbtu's/Bbl's)					60.07
January 2019 - December 2019 | Collars | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU					8,760,000
January 2019 - December 2019 | Collars | Natural gas | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					2.52
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					3.00
January 2019 - December 2019 | Collars | Natural gas | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					2.70
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					3.10
January 2019 - December 2019 | Collars | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					2.60
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					3.01
January 2019 - December 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					2,448,000
January 2019 - December 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential					(0.98)
January 2019 - December 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential					(6.50)
January 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential					(2.80)
January 2019 - December 2019 | Basis Swap | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU					9,307,500
January 2019 - December 2019 | Basis Swap | Natural gas | Minimum
Derivative and hedging activities
Basis Differential | $ / MMBTU					(1.05)
January 2019 - December 2019 | Basis Swap | Natural gas | Maximum
Derivative and hedging activities
Basis Differential | $ / MMBTU					(1.40)
January 2019 - December 2019 | Basis Swap | Natural gas | Weighted Average
Derivative and hedging activities
Basis Differential | $ / MMBTU					(1.18)
January 2019 - December 2019 | WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					1,825,000
Floors (in dollars per Mmbtu's/Bbl's)					0.35
January 2019 - December 2019 | WTI NYMEX Roll | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					0.35
January 2019 - December 2019 | Fixed Swap | NGLs
Derivative and hedging activities
Volume in Mmbtu's | MMBTU					1,460,000
January 2019 - December 2019 | Fixed Swap | NGLs | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					29.08
January 2019 - December 2019 | Fixed Swap | NGLs | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					30.15
January 2019 - December 2019 | Fixed Swap | NGLs | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU					29.33
April 2019 - June 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					91,000
Floors (in dollars per Mmbtu's/Bbl's)					50.00
Ceilings (in dollars per Mmbtu's/Bbl's)					55.00
April 2019 - June 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					50.00
Ceilings (in dollars per Mmbtu's/Bbl's)					55.00
April 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl					275,000
Floors (in dollars per Mmbtu's/Bbl's)					55.00
Ceilings (in dollars per Mmbtu's/Bbl's)					62.85
April 2019 - December 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)					55.00
Ceilings (in dollars per Mmbtu's/Bbl's)					62.85
January 2020 - June 2020 | Fixed Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		182,000,000
Floors (in dollars per Mmbtu's/Bbl's)		55.74
January 2020 - June 2020 | Fixed Swap | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		55.74
January 2020 - September 2020 | Fixed Swap | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU		1,186,000
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.61
January 2020 - September 2020 | Fixed Swap | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.61
January 2020 - December 2020 [Member] | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		549,000,000			549,000
Floors (in dollars per Mmbtu's/Bbl's)		50.00			50.00
Ceilings (in dollars per Mmbtu's/Bbl's)		70.00			70.00
January 2020 - December 2020 [Member] | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		50.00			50.00
Ceilings (in dollars per Mmbtu's/Bbl's)		70.00			70.00
January 2020 - December 2020 [Member] | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,464,000,000			3,294,000
January 2020 - December 2020 [Member] | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential		0.67			2.00
January 2020 - December 2020 [Member] | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential		0.85			4.00
January 2020 - December 2020 [Member] | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		0.72			2.95
January 2020 - December 2020 [Member] | WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		366,000,000
Floors (in dollars per Mmbtu's/Bbl's)		0.37
January 2020 - December 2020 [Member] | WTI NYMEX Roll | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.37
January 2020 - December 2020 [Member] | Call option | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		2,342,400,000			2,342,400
Ceilings (in dollars per Mmbtu's/Bbl's)		70.00			70.00
January 2020 - December 2020 [Member] | Call option | Crude oil | Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)		70.00			70.00
January 2020 - December 2020 [Member] | Put options | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		915,000,000			915,000
Floors (in dollars per Mmbtu's/Bbl's)		55.00			55.00
January 2020 - December 2020 [Member] | Put options | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		55.00			55.00
January 2020 - December 2020 [Member] | Fixed Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		732,000,000
January 2020 - December 2020 [Member] | Fixed Swap | Crude oil | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		55.68
January 2020 - December 2020 [Member] | Fixed Swap | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		60.00
January 2020 - December 2020 [Member] | Fixed Swap | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		57.84
January 2020 - December 2020 [Member] | Fixed Swap | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU		2,928,000
January 2020 - December 2020 [Member] | Fixed Swap | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.56
February 2020 - December 2020 | WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,340,000,000
February 2020 - December 2020 | WTI NYMEX Roll | Crude oil | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.41
February 2020 - December 2020 | WTI NYMEX Roll | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.54
February 2020 - December 2020 | WTI NYMEX Roll | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.44
April 2020 - December 2020 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		275,000,000
Basis Differential		0.75
April 2020 - December 2020 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		0.75
January 2021 - December 2021 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,460,000,000
January 2021 - December 2021 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential		0.82
January 2021 - December 2021 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential		0.95
January 2021 - December 2021 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		0.85
January 2021 - December 2021 | WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,460,000,000
January 2021 - December 2021 | WTI NYMEX Roll | Crude oil | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.13
January 2021 - December 2021 | WTI NYMEX Roll | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.14
January 2021 - December 2021 | WTI NYMEX Roll | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		0.14
January 2021 - December 2021 | Fixed Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,460,000,000
January 2021 - December 2021 | Fixed Swap | Crude oil | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		50.70
January 2021 - December 2021 | Fixed Swap | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		52.80
January 2021 - December 2021 | Fixed Swap | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		51.91
January 2021 - December 2021 | Fixed Swap | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU		2,190,000
January 2021 - December 2021 | Fixed Swap | Natural gas | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.47
January 2021 - December 2021 | Fixed Swap | Natural gas | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.48
January 2021 - December 2021 | Fixed Swap | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		2.47
January 2022 - December 2022 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,460,000,000
January 2022 - December 2022 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential		0.85
January 2022 - December 2022 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential		0.95
January 2022 - December 2022 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		0.88
January 2022 - December 2022 | WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		2,555,000,000
January 2022 - December 2022 | WTI NYMEX Roll | Crude oil | Minimum
Derivative and hedging activities
Floor (in dollars per Mmbtu's/Bbl's)		(0.02)
January 2022 - December 2022 | WTI NYMEX Roll | Crude oil | Maximum
Derivative and hedging activities
Floor (in dollars per Mmbtu's/Bbl's)		0.00
January 2022 - December 2022 | WTI NYMEX Roll | Crude oil | Weighted Average
Derivative and hedging activities
Floor (in dollars per Mmbtu's/Bbl's)		(0.01)
January 2022 - December 2022 | Fixed Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		1,460,000,000
Floors (in dollars per Mmbtu's/Bbl's)		51.50
January 2022 - December 2022 | Fixed Swap | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		51.50