Derivatives - Outstanding Derivative Contracts (Details) - Not Designated as Hedges	Sep. 30, 2020 MMBTU_per_day Bbls_per_day $ / bbl $ / MMBTU
Three-Way Collars - Crude Oil 2020 Q4
Derivative [Line Items]
Derivative, volume | Bbls_per_day	80,000
Derivative, ceiling	64.40
Derivative, floor	55.00
Derivative, sold put	48.00
Three-Way Collars - Crude Oil 2021, First Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Derivative, ceiling	0
Derivative, floor	0
Derivative, sold put	0
Three-Way Collars - Crude Oil 2021, Second Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Derivative, ceiling	0
Derivative, floor	0
Derivative, sold put	0
Two-Way Collars - Crude Oil 2020 Q4
Derivative [Line Items]
Derivative, volume | Bbls_per_day	20,000
Derivative, ceiling	46.83
Derivative, floor	37.00
Basis Swaps - Crude Oil 2021, First Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	10,000
Derivative, ceiling	52.37
Derivative, floor	35.00
Basis Swaps - Crude Oil 2021, Second Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	10,000
Derivative, ceiling	52.37
Derivative, floor	35.00
Midland Basis Swaps - Crude Oil 2020 Q4
Derivative [Line Items]
Derivative, volume | Bbls_per_day	15,000
Midland Basis Swaps - Crude Oil 2020 Q4 | Long
Derivative [Line Items]
Derivative, weighted average price	0.94
Midland Basis Swaps - Crude Oil 2021, First Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Midland Basis Swaps - Crude Oil 2021, First Half | Long
Derivative [Line Items]
Derivative, weighted average price	0
Midland Basis Swaps - Crude Oil 2021, Second Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Midland Basis Swaps - Crude Oil 2021, Second Half | Long
Derivative [Line Items]
Derivative, weighted average price	0
Brent Basis Swaps - Crude Oil 2020 Q4
Derivative [Line Items]
Derivative, volume | Bbls_per_day	5,000
Brent Basis Swaps - Crude Oil 2020 Q4 | Long
Derivative [Line Items]
Derivative, weighted average price	7.24
Brent Basis Swaps - Crude Oil 2021, First Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	1,630
Brent Basis Swaps - Crude Oil 2021, First Half | Long
Derivative [Line Items]
Derivative, weighted average price	7.24
Brent Basis Swaps - Crude Oil 2021, Second Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Brent Basis Swaps - Crude Oil 2021, Second Half | Long
Derivative [Line Items]
Derivative, weighted average price	0
NYMEX Roll Basis Swaps - Crude Oil 2020 Q4
Derivative [Line Items]
Derivative, volume | Bbls_per_day	30,000
NYMEX Roll Basis Swaps - Crude Oil 2020 Q4 | Long
Derivative [Line Items]
Derivative, weighted average price	0.81
NYMEX Roll Basis Swaps - Crude Oil 2021, First Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
NYMEX Roll Basis Swaps - Crude Oil 2021, First Half | Long
Derivative [Line Items]
Derivative, weighted average price	0
NYMEX Roll Basis Swaps - Crude Oil 2021, Second Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
NYMEX Roll Basis Swaps - Crude Oil 2021, Second Half | Long
Derivative [Line Items]
Derivative, weighted average price	0
Henry Hub ("HH") Two-Way Collars - Natural Gas 2020 Q4
Derivative [Line Items]
Derivative, volume | MMBTU_per_day	250,000
Derivative, ceiling | $ / MMBTU	2.82
Derivative, floor | $ / MMBTU	2.25
Henry Hub ("HH") Two-Way Collars - Natural Gas 2021, First Half
Derivative [Line Items]
Derivative, volume | MMBTU_per_day	175,000
Derivative, ceiling | $ / MMBTU	3.10
Derivative, floor | $ / MMBTU	2.46
Henry Hub ("HH") Two-Way Collars - Natural Gas 2021, Second Half
Derivative [Line Items]
Derivative, volume | MMBTU_per_day	150,000
Derivative, ceiling | $ / MMBTU	3.03
Derivative, floor | $ / MMBTU	2.43
WAHA/HH Basis Swaps - Natural Gas 2020 Q4
Derivative [Line Items]
Derivative, volume | MMBTU_per_day	10,000
WAHA/HH Basis Swaps - Natural Gas 2020 Q4 | Long
Derivative [Line Items]
Derivative, weighted average price | $ / MMBTU	0.37
WAHA/HH Basis Swaps - Natural Gas 2021, First Half
Derivative [Line Items]
Derivative, volume | MMBTU_per_day	0
WAHA/HH Basis Swaps - Natural Gas 2021, First Half | Long
Derivative [Line Items]
Derivative, weighted average price | $ / MMBTU	0
WAHA/HH Basis Swaps - Natural Gas 2021, Second Half
Derivative [Line Items]
Derivative, volume | MMBTU_per_day	0
WAHA/HH Basis Swaps - Natural Gas 2021, Second Half | Long
Derivative [Line Items]
Derivative, weighted average price | $ / MMBTU	0
Fixed Price Ethane Swaps - NGL 2020 Q4
Derivative [Line Items]
Derivative, volume | Bbls_per_day	10,000
Fixed Price Ethane Swaps - NGL 2020 Q4 | Short
Derivative [Line Items]
Derivative, weighted average price	8.78
Fixed Price Ethane Swaps - NGL 2021, First Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Fixed Price Ethane Swaps - NGL 2021, First Half | Short
Derivative [Line Items]
Derivative, weighted average price	0
Fixed Price Ethane Swaps - NGL 2021, Second Half
Derivative [Line Items]
Derivative, volume | Bbls_per_day	0
Fixed Price Ethane Swaps - NGL 2021, Second Half | Short
Derivative [Line Items]
Derivative, weighted average price	0