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Derivative Financial Instruments (Details)
bbl in Thousands, BTU in Billions
Nov. 01, 2019
BTU
$ / Barrels
$ / EnergyContent
bbl
Sep. 30, 2019
BTU
$ / Barrels
$ / EnergyContent
bbl
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   7,441
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels   59.64
NYMEX Oil Swap Contracts [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume   9,126
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   6,010
Derivative, Weighted-Average Floor Price | $ / Barrels   55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels   62.95
NYMEX Oil Collar Contract, Year 3 [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume   329
Derivative, Weighted-Average Floor Price | $ / Barrels   55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels   56.70
NYMEX Oil Collar Contracts [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume   9,507
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, Oil Basis Swap Type, 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, Oil Basis Swap Type, 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, Oil Basis Swap Type, 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, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels [1]   0
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume   21,136
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, Oil Basis Swap Type, 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, Oil Basis Swap Type, 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, Oil Basis Swap Type, 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, Oil Basis Swap Type, 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
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   1.70
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU   4,977
WAHA [Member] | Gas Swaps Contracts [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU [3]   7,939
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   2.87
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU   11,773
IF HSC [Member] | Gas Swaps Contracts [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU [3]   26,206
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   4,818
IF WAHA [Member]    
Derivative Financial Instruments    
Index percent of natural gas fixed swaps   56.00%
GD WAHA [Member]    
Derivative Financial Instruments    
Index percent of natural gas fixed swaps   44.00%
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   1,607
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   1,187
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels   23.58
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume   1,847
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   39
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   29
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   50
Subsequent Event [Member] | NYMEX Oil Swap Contract, Third Quarter of Year 2 [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume 900  
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels 51.61  
Subsequent Event [Member] | IF HSC [Member] | Gas Swaps Contract, Year 2 [Member]    
Derivative Financial Instruments    
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent 2.28  
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 9,725  
Subsequent Event [Member] | IF WAHA [Member] | Gas Swaps Contract,Year 2 and Year 3 [Member]    
Derivative Financial Instruments    
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent 1.06  
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 12,229  
Subsequent Event [Member] | OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member]    
Derivative Financial Instruments    
Derivative, Nonmonetary Notional Amount, Volume 500  
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels 19.27  
[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 September 30, 2019, WAHA volumes were comprised of 56 percent IF WAHA and 44 percent GD WAHA.