Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions		Aug. 02, 2019 BTU $ / EnergyContent $ / Barrels bbl	Jun. 30, 2019 BTU $ / EnergyContent $ / Barrels bbl
NYMEX Oil Swap Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,217
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			61.41
NYMEX Oil Swap Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,685
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			61.38
NYMEX Oil Swap Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			6,711
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			59.96
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			9,613
NYMEX Oil Collar Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,547
Derivative, Weighted- Average Floor Price | $ / Barrels			49.50
Derivative, Weighted-Average Ceiling Price | $ / Barrels			62.64
NYMEX Oil Collar Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,168
Derivative, Weighted- Average Floor Price | $ / Barrels			50.54
Derivative, Weighted-Average Ceiling Price | $ / Barrels			62.49
NYMEX Oil Collar Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			5,094
Derivative, Weighted- Average Floor Price | $ / Barrels			55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels			63.68
NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			10,809
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,291
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		(2.86)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,338
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		(2.87)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			14,090
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		(0.73)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 3 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,708
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		0.33
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 4 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		0
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			24,427
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Weighted-Average Contract Price | $ / Barrels	[2]		0
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Weighted-Average Contract Price | $ / Barrels	[2]		0
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,750
Derivative, Weighted-Average Contract Price | $ / Barrels	[2]		(8.03)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 3 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,650
Derivative, Weighted-Average Contract Price | $ / Barrels	[2]		(7.86)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 4 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,650
Derivative, Weighted-Average Contract Price | $ / Barrels	[2]		(7.78)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			10,050
IF HSC [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			78.00%
IF HSC [Member] | Gas Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent			2.84
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			14,102
IF HSC [Member] | Gas Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent			2.88
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			14,433
IF HSC [Member] | Gas Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent			2.90
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			10,963
IF HSC [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	[3]		39,498
IF HSC [Member] | Gas Collar Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Weighted- Average Floor Price | $ / EnergyContent			2.50
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent			2.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			5,066
IF HSC [Member] | Gas Collar Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Weighted- Average Floor Price | $ / EnergyContent			2.50
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent			2.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			4,818
IF HSC [Member] | Gas Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			9,884
WAHA [Member] | Gas Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent			1.30
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			4,340
WAHA [Member] | Gas Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent			1.75
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			2,962
WAHA [Member] | Gas Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent			1.91
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			4,034
WAHA [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	[3]		11,336
GD Waha [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			11.00%
IF Waha [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			11.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			907
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			12.34
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			896
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			12.36
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			711
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			11.38
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,514
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			708
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			30.98
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			660
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			31.60
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			420
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			27.99
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,788
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			39
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			35.64
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			39
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			35.64
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			0
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			78
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			30
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			35.70
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			29
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			35.70
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			0
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			59
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			50
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			50.93
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			50
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			50.93
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels			0
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			100
Subsequent Event [Member] | NYMEX Oil Swap Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		600
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		56.90
Subsequent Event [Member] | NYMEX Oil Collar Contract, Year 3 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,200
Derivative, Weighted- Average Floor Price | $ / Barrels		55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels		58.31
Subsequent Event [Member] | IF HSC [Member] | Gas Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.48
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		810
Subsequent Event [Member] | WAHA [Member] | Gas Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		943

[1] ⁽¹⁾  Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma).

[2] ⁽²⁾  Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea).

[3] ⁽¹⁾   The Company has natural gas swaps in place that settle against Inside FERC Houston Ship Channel (“IF HSC”), Inside FERC West Texas (“IF WAHA”), and Platt’s Gas Daily West Texas (“GD WAHA”). As of June 30, 2019, total volumes for gas swaps are comprised of 78 percent IF HSC, 11 percent GD Waha, and 11 percent IF Waha.