Derivatives - Outstanding Derivative Contracts (Details) - Not Designated as Hedges	1 Months Ended	3 Months Ended
	Apr. 29, 2019 Bbls_per_day $ / bbl	Mar. 31, 2019 Bbls_per_day $ / bbl
Midland Basis Swaps - Crude Oil 2019 Q2 [Member] [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		10,000
Underlying, Derivative Volume		(0.82)
Midland Basis Swaps - Crude Oil 2019 Q4 [Member] [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		15,000
Underlying, Derivative Volume		(1.40)
Midland Basis Swaps - Crude Oil 2019 Q3 [Member] [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		15,000
Underlying, Derivative Volume		(1.40)
NYMEX Roll Basis Swaps - Crude Oil 2019 Q2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		60,000
Underlying, Derivative Volume		0.38
Three-Way Collars - Crude Oil 2019 Q2, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume		48.71
Three-Way Collars - Crude Oil 2019 Q2, Floor [Member]
Derivative [Line Items]
Underlying, Derivative Volume		55.86
Three-Way Collars - Crude Oil 2019 Q2, Ceiling [Member]
Derivative [Line Items]
Underlying, Derivative Volume		71.21
Three-Way Collars - Crude Oil 2019 Q2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		70,000
Three-Way Collars - Crude Oil 2019 Q3 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		50,000
Three-Way Collars - Crude Oil 2019 Q4 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		50,000
Three-Way Collars - Crude Oil 2020 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Three-Way Collars - Crude Oil 2019 Q3, Ceiling [Member]
Derivative [Line Items]
Underlying, Derivative Volume		75.88
Three-Way Collars - Crude Oil 2019 Q4, Ceiling [Member]
Derivative [Line Items]
Underlying, Derivative Volume		75.88
Three-Way Collars - Crude Oil 2020, Ceiling [Member]
Derivative [Line Items]
Underlying, Derivative Volume		0
Three-Way Collars - Crude Oil 2019 Q3, Floor [Member]
Derivative [Line Items]
Underlying, Derivative Volume		57.80
Three-Way Collars - Crude Oil 2019 Q4, Floor [Member]
Derivative [Line Items]
Underlying, Derivative Volume		57.80
Three-Way Collars - Crude Oil 2020, Floor [Member]
Derivative [Line Items]
Underlying, Derivative Volume		0
Three-Way Collars - Crude Oil 2019 Q3, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume		50.80
Three-Way Collars - Crude Oil 2019 Q4, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume		50.80
Three-Way Collars - Crude Oil 2020, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume		0
Brent Basis Swaps - Crude Oil 2019 Q2 [Member] [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		5,000
Underlying, Derivative Volume		(7.24)
Brent Basis Swaps - Crude Oil 2020 [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		5,000
Underlying, Derivative Volume		(7.24)
Brent Basis Swaps - Crude Oil 2019 Q4 [Member] [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		5,000
Underlying, Derivative Volume		(7.24)
Brent Basis Swaps - Crude Oil 2019 Q3 [Member] [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		5,000
Underlying, Derivative Volume		(7.24)
NYMEX Roll Basis Swaps - Crude Oil 2019 Q3 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		60,000
Underlying, Derivative Volume		0.38
NYMEX Roll Basis Swaps - Crude Oil 2019 Q4 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		60,000
Underlying, Derivative Volume		0.38
NYMEX Roll Basis Swaps - Crude Oil 2020 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Underlying, Derivative Volume		0
Midland Basis Swaps - Crude Oil 2020 [Domain]
Derivative [Line Items]
Volume | Bbls_per_day		15,000
Underlying, Derivative Volume		(0.94)
Clearbrook Basis Swaps Crude Oil 2019 Q2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		1,000
Underlying, Derivative Volume		(3.50)
Clearbrook Basis Swaps Crude Oil Clearbrook Basis Swaps Crude Oil 2019 Q3 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		1,000
Underlying, Derivative Volume		(3.50)
Clearbrook Basis Swaps Crude Oil 2019 Q4 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		1,000
Underlying, Derivative Volume		(3.50)
Clearbrook Basis Swaps Crude Oil 2019 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Underlying, Derivative Volume		0
Clearbrook Basis Swaps Crude Oil 2021 Q1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Underlying, Derivative Volume		0
Three-Way Collars - Crude Oil 2019 Q1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Three-Way Collars - Crude Oil 2019 Q1, Ceiling [Member]
Derivative [Line Items]
Underlying, Derivative Volume		0
Three-Way Collars - Crude Oil 2021 Q1, Floor [Member]
Derivative [Line Items]
Underlying, Derivative Volume		0
Three-Way Collars - Crude Oil 2021, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume		0
Midland Basis Swaps - Crude Oil 2021 Q1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Underlying, Derivative Volume		0
Brent Basis Swaps - Crude Oil 2021 Q1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		3,278
Underlying, Derivative Volume		(7.24)
NYMEX Roll Basis Swaps - Crude Oil 2021 Q1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		0
Underlying, Derivative Volume		0
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, Ceiling, Two [Member]
Derivative [Line Items]
Underlying, Derivative Volume	74.09
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, One [Member]
Derivative [Line Items]
Volume | Bbls_per_day	20,000
Subsequent Event [Member] | Three-Way Collars - Crude Oil January-June 2020 [Member]
Derivative [Line Items]
Volume | Bbls_per_day	20,000
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, Ceiling, One [Member]
Derivative [Line Items]
Underlying, Derivative Volume	70.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil 2020, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume	47.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, Floor, One [Member]
Derivative [Line Items]
Underlying, Derivative Volume	55.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, Two [Member]
Derivative [Line Items]
Volume | Bbls_per_day	10,000
Subsequent Event [Member] | Three-Way Collars - Crude Oil January-June 2020, Ceiling [Member]
Derivative [Line Items]
Underlying, Derivative Volume	70.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil January-June 2020, Sold Put [Member]
Derivative [Line Items]
Underlying, Derivative Volume	47.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil January-June 2020, Floor [Member]
Derivative [Line Items]
Underlying, Derivative Volume	55.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, Sold Put, Two [Member]
Derivative [Line Items]
Underlying, Derivative Volume	48.00
Subsequent Event [Member] | Three-Way Collars - Crude Oil July-December 2019, Floor, Two [Member]
Derivative [Line Items]
Underlying, Derivative Volume	55.00