DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Instruments (Details) bbl in Thousands, MMBTU in Thousands	1 Months Ended	3 Months Ended
	May 06, 2021 $ / bbl bbl / d	Mar. 31, 2021 $ / bbl $ / MMBTU MMBTU Counterparty bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties | Counterparty		10
Fixed Price Swaps | April—June 2021 | Crude Oil | NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		5,642
Derivative weighted average fixed price (USD per bbl)		61.20
Fixed Price Swaps | April—June 2021 | Crude Oil | Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		2,366
Derivative weighted average fixed price (USD per bbl)		64.20
Fixed Price Swaps | April—June 2021 | Crude Oil | Dated Brent | Subsequent Event
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative nonmonetary fixed price total (in Mbbls/d) | bbl / d	19,714
Derivative weighted average price (USD per bbl)	64.07
Fixed Price Swaps | July—September 2021 | Crude Oil | NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		1,472
Derivative weighted average fixed price (USD per bbl)		60.18
Fixed Price Swaps | July—September 2021 | Crude Oil | NYMEX WTI | Subsequent Event
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative nonmonetary fixed price total (in Mbbls/d) | bbl / d	6,000
Derivative weighted average price (USD per bbl)	60.10
Fixed Price Swaps | July—September 2021 | Crude Oil | Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		414
Derivative weighted average fixed price (USD per bbl)		63.14
Fixed Price Swaps | July—September 2021 | Crude Oil | Dated Brent | Subsequent Event
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative nonmonetary fixed price total (in Mbbls/d) | bbl / d	13,500
Derivative weighted average price (USD per bbl)	63.06
Fixed Price Swaps | October—December 2021 | Crude Oil | NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		1,012
Derivative weighted average fixed price (USD per bbl)		58.59
Fixed Price Swaps | October—December 2021 | Crude Oil | Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		828
Derivative weighted average fixed price (USD per bbl)		61.44
Basis Swap | July—September 2021 | Crude Oil | Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		2,024
Weighted average price differential		0.61
Basis Swap | October—December 2021 | Crude Oil | Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		1,012
Weighted average price differential		0.70
Basis Swap | May—June 2021 | Crude Oil | Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) | bbl		3,782
Weighted average price differential		0.56
Basis Swap Purchased | April—December 2021 | Natural Gas | NYMEX Henry Hub/IF Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) | MMBTU		37,580
Weighted average price differential | $ / MMBTU		(0.43)
Basis Swap Purchased | January—December 2022 | Natural Gas | NYMEX Henry Hub/IF Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) | MMBTU		43,800
Weighted average price differential | $ / MMBTU		(0.45)
Basis Swap Sold | April—December 2021 | Natural Gas | NYMEX Henry Hub/IF HSC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) | MMBTU		37,580
Weighted average price differential | $ / MMBTU		(0.07)
Basis Swap Sold | January—December 2022 | Natural Gas | NYMEX Henry Hub/IF HSC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) | MMBTU		43,800
Weighted average price differential | $ / MMBTU		(0.08)