DERIVATIVES - SUMMARY OF DERIVATIVE INSTRUMENTS (Details) - Oil	Dec. 31, 2019 ThousandBarrels / d $ / Barrel
2020 Settlement
Derivative [Line Items]
Derivative instruments (mmbls/day) | ThousandBarrels / d	128,100
2020 Settlement | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel)	74.16
Purchase price (dollars per barrel)	45.00
2020 Settlement | Long position
Derivative [Line Items]
Purchase price (dollars per barrel)	55.00
2021 Settlement
Derivative [Line Items]
Derivative instruments (mmbls/day) | ThousandBarrels / d	127,800
2021 Settlement | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel)	74.16