DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Open Commodity Swap Contracts (Details) Mcf in Millions	12 Months Ended
	Dec. 31, 2019 $ / bbl Mcf bbl
Derivative Instruments, Gain (Loss) [Line Items]
Oil (in bbl) | Mcf	17.3
Weighted Average Price (in dollar per bbl)	56.77
Open Commodity Swap, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Oil (in bbl) | bbl	9,815,844
Weighted Average Price (in dollar per bbl)	57.98
Open Commodity Swap, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Oil (in bbl) | bbl	6,151,174
Weighted Average Price (in dollar per bbl)	55.78
Notional amount covered by options (in shares) | Mcf	0.1
Weighted average price if options are exercised (in dollars per barrel)	57.63
Open Commodity Swap, 2022 and beyond
Derivative Instruments, Gain (Loss) [Line Items]
Oil (in bbl) | bbl	1,372,866
Weighted Average Price (in dollar per bbl)	52.57
Notional amount covered by options (in shares) | bbl	2,400,000
Weighted average price if options are exercised (in dollars per barrel)	55.05