DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Summary of Open Commodity Derivative Positions (Details)	Mar. 31, 2021 MMBTU bbl $ / MMBTU $ / bbl
WTI NYMEX - Swaps | 2021
Derivative [Line Items]
Volume | bbl	6,350,574
Weighted average price (in dollars per unit) | $ / bbl	54.80
WTI NYMEX - Swaps | 2022
Derivative [Line Items]
Volume | bbl	4,218,250
Weighted average price (in dollars per unit) | $ / bbl	51.66
WTI NYMEX - Swaps | 2023
Derivative [Line Items]
Volume | bbl	112,500
Weighted average price (in dollars per unit) | $ / bbl	51.65
WTI NYMEX - Swaps | 2024
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
WTI NYMEX - Swaptions | 2021
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
WTI NYMEX - Swaptions | 2022
Derivative [Line Items]
Volume | bbl	1,496,125
Weighted average price (in dollars per unit) | $ / bbl	50.13
WTI NYMEX - Swaptions | 2023
Derivative [Line Items]
Volume | bbl	3,691,000
Weighted average price (in dollars per unit) | $ / bbl	50.31
WTI NYMEX - Swaptions | 2024
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
Bakken Crude UHC To WTI NYMEX - Basis Swaps | 2021
Derivative [Line Items]
Volume | bbl	4,155,800
Weighted average price (in dollars per unit) | $ / bbl	(2.40)
Bakken Crude UHC To WTI NYMEX - Basis Swaps | 2022
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
Bakken Crude UHC To WTI NYMEX - Basis Swaps | 2023
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
Bakken Crude UHC To WTI NYMEX - Basis Swaps | 2024
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
WTI NYMEX - Call Options | 2021
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
WTI NYMEX - Call Options | 2022
Derivative [Line Items]
Volume | bbl	0
Weighted average price (in dollars per unit) | $ / bbl	0
WTI NYMEX - Call Options | 2023
Derivative [Line Items]
Volume | bbl	365,000
Weighted average price (in dollars per unit) | $ / bbl	55.00
WTI NYMEX - Call Options | 2024
Derivative [Line Items]
Volume | bbl	1,275,000
Weighted average price (in dollars per unit) | $ / bbl	52.89
Henry Hub NYMEX - Swaps | 2021
Derivative [Line Items]
Volume	22,637,745
Weighted average price (in dollars per unit) | $ / MMBTU	2.81
Henry Hub NYMEX - Swaps | 2022
Derivative [Line Items]
Volume	5,450,000
Weighted average price (in dollars per unit) | $ / MMBTU	2.80
Henry Hub NYMEX - Swaps | 2023
Derivative [Line Items]
Volume	0
Weighted average price (in dollars per unit) | $ / MMBTU	0
Henry Hub NYMEX - Swaps | 2024
Derivative [Line Items]
Volume	0
Weighted average price (in dollars per unit) | $ / MMBTU	0
Waha Inside FERC to Henry Hub - Basis Swaps | 2021
Derivative [Line Items]
Volume	69,000
Weighted average differential (in dollars per unit) | $ / bbl	(0.28)
Waha Inside FERC to Henry Hub - Basis Swaps | 2022
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / bbl	0
Waha Inside FERC to Henry Hub - Basis Swaps | 2023
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / bbl	0
Waha Inside FERC to Henry Hub - Basis Swaps | 2024
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / bbl	0
Columbia/TCO-POOL - Basis Swaps | 2021
Derivative [Line Items]
Volume	1,959,697
Weighted average differential (in dollars per unit) | $ / MMBTU	(0.45)
Columbia/TCO-POOL - Basis Swaps | 2022
Derivative [Line Items]
Volume	1,067,187
Weighted average differential (in dollars per unit) | $ / MMBTU	(0.43)
Columbia/TCO-POOL - Basis Swaps | 2023
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / MMBTU	0
Columbia/TCO-POOL - Basis Swaps | 2024
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / MMBTU	0
Dominion - App - Basis Swaps | 2021
Derivative [Line Items]
Volume	653,232
Weighted average differential (in dollars per unit) | $ / MMBTU	(0.64)
Dominion - App - Basis Swaps | 2022
Derivative [Line Items]
Volume	355,729
Weighted average differential (in dollars per unit) | $ / MMBTU	(0.64)
Dominion - App - Basis Swaps | 2023
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / MMBTU	0
Dominion - App - Basis Swaps | 2024
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / MMBTU	0
NE - TETCO M2 - Basis Swaps | 2021
Derivative [Line Items]
Volume	3,919,394
Weighted average differential (in dollars per unit) | $ / MMBTU	(0.68)
NE - TETCO M2 - Basis Swaps | 2022
Derivative [Line Items]
Volume	2,134,374
Weighted average differential (in dollars per unit) | $ / MMBTU	(0.71)
NE - TETCO M2 - Basis Swaps | 2023
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / MMBTU	0
NE - TETCO M2 - Basis Swaps | 2024
Derivative [Line Items]
Volume	0
Weighted average differential (in dollars per unit) | $ / MMBTU	0
TET-OPIS - Swaps | 2021
Derivative [Line Items]
Volume	92,000
Weighted average price (in dollars per unit) | $ / MMBTU	34.34
TET-OPIS - Swaps | 2022
Derivative [Line Items]
Volume	0
Weighted average price (in dollars per unit) | $ / MMBTU	0
TET-OPIS - Swaps | 2023
Derivative [Line Items]
Volume	0
Weighted average price (in dollars per unit) | $ / MMBTU	0
TET-OPIS - Swaps | 2024
Derivative [Line Items]
Volume	0
Weighted average price (in dollars per unit) | $ / MMBTU	0