DERIVATIVES - Summary of Company's derivative position (Details)	12 Months Ended
	Dec. 31, 2019 bbl MMBTU $ / MMBTU $ / bbl
Oil Swaps One
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	1,028
Weighted Average Price (in dollars per barrel) | $ / bbl	56.28
Oil Swaps Two
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	370
Weighted Average Price (in dollars per barrel) | $ / bbl	53.07
Basis Swaps
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	1,500
Weighted Average Price (in dollars per barrel) | $ / bbl	5.62
Three Way Collar - Floor Sold Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	228
Weighted Average Price (in dollars per barrel) | $ / bbl	40.00
Three Way Collar - Floor Purchase Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	228
Weighted Average Price (in dollars per barrel) | $ / bbl	50.00
Three Way Collar - Ceiling Sold Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	228
Weighted Average Price (in dollars per barrel) | $ / bbl	59.60
Three Way Collar - Floor Sold Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	80
Weighted Average Price (in dollars per barrel) | $ / bbl	37.50
Three Way Collar - Floor Purchase Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	80
Weighted Average Price (in dollars per barrel) | $ / bbl	47.50
Three Way Collar - Ceiling Sold Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	80
Weighted Average Price (in dollars per barrel) | $ / bbl	59.30
Oil Collar - Floor Purchase Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	512
Weighted Average Price (in dollars per barrel) | $ / bbl	49.50
Oil Collar - Ceiling Sold Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	512
Weighted Average Price (in dollars per barrel) | $ / bbl	63.87
Oil Collar - Floor Purchase Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	742
Weighted Average Price (in dollars per barrel) | $ / bbl	50.00
Oil Callar - Ceiling Sold Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | bbl	742
Weighted Average Price (in dollars per barrel) | $ / bbl	59.70
Gas Swaps One
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	4,557
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.57
Gas Swaps Two
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	4,184
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.77
Three Way Collar - Floor Sold Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	563
Weighted Average Price (in dollars per barrel) | $ / MMBTU	1.60
Three Way Collar - Floor Purchase Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	563
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.10
Three Way Collar - Ceiling Sold Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	563
Weighted Average Price (in dollars per barrel) | $ / MMBTU	3.00
Three Way Collar - Floor Sold Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	133
Weighted Average Price (in dollars per barrel) | $ / MMBTU	1.65
Three Way Collar - Floor Purchase Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	133
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.15
Three Way Collar - Ceiling Sold Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	133
Weighted Average Price (in dollars per barrel) | $ / MMBTU	3.05
Gas Collar - Floor Purchase Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	2,748
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.55
Gas Collar - Ceiling Sold Price One
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	2,748
Weighted Average Price (in dollars per barrel) | $ / MMBTU	3.07
Gas Collar - Floor Purchase Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	4,464
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.20
Gas Collar - Ceiling Sold Price Two
Derivative [Line Items]
Notional Volume (in barrels per day) | MMBTU	4,464
Weighted Average Price (in dollars per barrel) | $ / MMBTU	2.97