Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions		May 02, 2019 $ / Barrels bbl	Mar. 31, 2019 BTU $ / EnergyContent $ / Barrels bbl
NYMEX Oil Swap Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			575
Derivative, Swap Type, Average Fixed Price | $ / Barrels			55.52
NYMEX Oil Swap Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,217
Derivative, Swap Type, Average Fixed Price | $ / Barrels			61.41
NYMEX Oil Swap Contract Fourth Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,115
Derivative, Swap Type, Average Fixed Price | $ / Barrels			59.97
NYMEX Oil Swap Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,491
Derivative, Swap Type, Average Fixed Price | $ / Barrels			65.68
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			5,398
NYMEX Oil Collar Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,034
Derivative, Weighted- Average Floor Price | $ / Barrels			52.39
Derivative, Weighted-Average Ceiling Price | $ / Barrels			64.32
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			3,405
Derivative, Weighted- Average Floor Price | $ / Barrels			55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels			63.00
NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			12,154
Gas Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			14,242
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,571
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		(4.49)
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			11,601
Derivative, Weighted-Average Contract Price | $ / Barrels	[1]		(1.03)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 3 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,707
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]		0.00
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			24,508
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Weighted-Average Contract Price | $ / Barrels	[2]		0.00
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]		0.00
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]		0.00
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 Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			2.82
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			11,177
IF HSC [Member] | Gas Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed 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, Average Fixed 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, Average Fixed Price | $ / EnergyContent			2.98
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			9,123
IF HSC [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	[3]		48,835
IF HSC [Member] | Gas Collar Contract Second 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			4,358
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
WAHA [Member] | Gas Swaps Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			0.70
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			4,546
WAHA [Member] | Gas Swaps Contract Third Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed 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, Average Fixed 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, Average Fixed Price | $ / EnergyContent			2.20
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			2,060
WAHA [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	[3]		13,908
GD Waha [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			12.00%
IF Waha [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			10.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			877
Derivative, Swap Type, Average Fixed Price | $ / Barrels			12.29
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, Average Fixed 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, Average Fixed 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, Average Fixed Price | $ / Barrels			11.38
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,391
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			561
Derivative, Swap Type, Average Fixed Price | $ / Barrels			31.32
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			637
Derivative, Swap Type, Average Fixed Price | $ / Barrels			31.29
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			651
Derivative, Swap Type, Average Fixed Price | $ / Barrels			31.64
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Derivative, Swap Type, Average Fixed Price | $ / Barrels			0.00
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,849
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			38
Derivative, Swap Type, Average Fixed Price | $ / Barrels			35.64
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, Average Fixed 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, Average Fixed 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, Average Fixed Price | $ / Barrels			0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			116
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			29
Derivative, Swap Type, Average Fixed Price | $ / Barrels			35.70
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, Average Fixed 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, Average Fixed 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, Average Fixed Price | $ / Barrels			0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			88
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter of Current Fiscal Year [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			49
Derivative, Swap Type, Average Fixed Price | $ / Barrels			50.93
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, Average Fixed 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, Average Fixed 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, Average Fixed Price | $ / Barrels			0.00
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			149
Subsequent Event [Member] | NYMEX Oil Swap Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,600
Derivative, Swap Type, Average Fixed Price | $ / Barrels		61.49
Subsequent Event [Member] | NYMEX Oil Collar Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,700
Derivative, Weighted- Average Floor Price | $ / Barrels		55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels		65.07
Subsequent Event [Member] | OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		600
Derivative, Swap Type, Average Fixed Price | $ / Barrels		28.10

[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 March 31, 2019, total volumes for gas swaps are comprised of 78 percent IF HSC, 12 percent GD Waha, and 10 percent IF Waha.