DERIVATIVES - Open Derivative Positions (Details) Mcf in Thousands, MMBTU in Thousands	12 Months Ended
	Dec. 31, 2019 MMBTU $ / Mcf $ / bbl $ / MMBTU Mcf bbl
WTI Cushing Oil Swaps 2020
Derivative [Line Items]
Volume (Bbls) | bbl	4,754,000
Fixed Price Swap (per Bbl/MMBtu)	57.78
WTI Cushing Oil Swaps 2021
Derivative [Line Items]
Volume (Bbls) | bbl	0
Fixed Price Swap (per Bbl/MMBtu)	0
WTI Magellan East Houston Oil Swaps 2020
Derivative [Line Items]
Volume (Bbls) | bbl	2,196,000
Fixed Price Swap (per Bbl/MMBtu)	62.80
WTI Magellan East Houston Oil Swaps 2021
Derivative [Line Items]
Volume (Bbls) | bbl	0
Fixed Price Swap (per Bbl/MMBtu)	0
BRENT Oil Swaps 2020
Derivative [Line Items]
Volume (Bbls) | bbl	4,569,000
Fixed Price Swap (per Bbl/MMBtu)	61.84
BRENT Oil Swaps 2021
Derivative [Line Items]
Volume (Bbls) | bbl	0
Fixed Price Swap (per Bbl/MMBtu)	0
Oil Basis Swaps 2020
Derivative [Line Items]
Volume (Bbls) | bbl	13,860,000
Fixed Price Swap (per Bbl/MMBtu)	(1.20)
Oil Basis Swaps 2021
Derivative [Line Items]
Volume (Bbls) | bbl	0
Fixed Price Swap (per Bbl/MMBtu)	0
Oil Rolling Hedge 2020
Derivative [Line Items]
Volume (Bbls) | bbl	6,700,000
Fixed Price Swap (per Bbl/MMBtu)	0.44
Oil Rolling Hedge 2021
Derivative [Line Items]
Volume (Bbls) | bbl	0
Fixed Price Swap (per Bbl/MMBtu)	0
Natural Gas Swaps - Henry Hub 2020
Derivative [Line Items]
Volume, energy measure (MMBtu) | MMBTU	10,050
Fixed Price Swap (per Bbl/MMBtu) | $ / MMBTU	2.55
Natural Gas Swaps - Henry Hub 2021
Derivative [Line Items]
Volume, energy measure (MMBtu) | MMBTU	0
Fixed Price Swap (per Bbl/MMBtu) | $ / MMBTU	0
Natural Gas Swaps - Waha Hub 2020
Derivative [Line Items]
Volume, energy measure (MMBtu) | MMBTU	16,750
Fixed Price Swap (per Bbl/MMBtu) | $ / MMBTU	1.67
Natural Gas Swaps - Waha Hub 2021
Derivative [Line Items]
Volume, energy measure (MMBtu) | MMBTU	0
Fixed Price Swap (per Bbl/MMBtu) | $ / MMBTU	0
Natural Gas Basis Swaps - Waha Hub 2020
Derivative [Line Items]
Volume, energy measure (MMBtu) | MMBTU	23,450
Fixed Price Swap (per Bbl/MMBtu) | $ / MMBTU	(1.19)
Natural Gas Basis Swaps - Waha Hub 2021
Derivative [Line Items]
Volume, energy measure (MMBtu) | MMBTU	54,750
Fixed Price Swap (per Bbl/MMBtu) | $ / MMBTU	(0.70)
2020 Three-Way Collars - WTI
Derivative [Line Items]
Volume (Bbls) | bbl	6,842,200
Short put price (per Bbl)	44.20
Floor price (per Bbl)	54.20
Ceiling price (per Bbl)	65.42
2020 Three-Way Collars - BRENT
Derivative [Line Items]
Volume (Bbls) | bbl	11,803,500
Short put price (per Bbl)	50.00
Floor price (per Bbl)	60.00
Ceiling price (per Bbl)	70.86
2020 Three-Way Collars - WTI Magellan East Houston
Derivative [Line Items]
Volume (Bbls) | bbl	5,124,000
Short put price (per Bbl)	50.00
Floor price (per Bbl)	60.00
Ceiling price (per Bbl)	68.61
Gas Swap Double-Up - Waha Hub
Derivative [Line Items]
Volume (Bbls) | Mcf	10,050
Fixed Price Swap (per Bbl/MMBtu) | $ / Mcf	1.70
Option price (per Mcf) | $ / Mcf	1.70