DERIVATIVES - SUMMARY OF DERIVATIVE INSTRUMENTS (Details)	Dec. 31, 2020 ThousandBarrels / d $ / Barrel $ / bbl
Oil | 2021 Settlement - oil
Derivative [Line Items]
Derivative instruments (mmbls or mmbtu) | ThousandBarrels / d	127,800
Oil | 2021 Settlement - oil | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel) | $ / Barrel	74.16
Gas | 2021 Settlement - natural gas
Derivative [Line Items]
Derivative instruments (mmbls or mmbtu) | ThousandBarrels / d	177,000.0
Gas | 2021 Settlement - natural gas | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel) | $ / Barrel	3.64
Gas | 2021 Settlement - natural gas | Long position
Derivative [Line Items]
Purchase price (dollars per barrel) | $ / bbl	2.50