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Derivative Financial Instruments (Details)
bbl in Thousands, BTU in Billions
Dec. 31, 2018
BTU
$ / EnergyContent
$ / Barrels
bbl
NYMEX Oil Swap Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 826
Derivative, Swap Type, Average Fixed Price | $ / Barrels 60.16
NYMEX Oil Swap Contract Second Quarter 2019 [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 2019 [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 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 1,115
Derivative, Swap Type, Average Fixed Price | $ / Barrels 59.97
NYMEX Oil Swap Contract 2020 [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 6,224
NYMEX Oil Collar Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,503
Derivative, Floor Price | $ / Barrels 51.66
Derivative, Ceiling Price | $ / Barrels 64.32
NYMEX Oil Collar Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,802
Derivative, Floor Price | $ / Barrels 52.18
Derivative, Ceiling Price | $ / Barrels 64.61
NYMEX Oil Collar Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,364
Derivative, Floor Price | $ / Barrels 49.07
Derivative, Ceiling Price | $ / Barrels 62.67
NYMEX Oil Collar Contract Fourth Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,386
Derivative, Floor Price | $ / Barrels 49.08
Derivative, Ceiling Price | $ / Barrels 62.65
NYMEX Oil Collar Contract 2020 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 1,165
Derivative, Floor Price | $ / Barrels 55.00
Derivative, Ceiling Price | $ / Barrels 66.47
NYMEX Oil Collar Contracts [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 11,220
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,433
Derivative, Weighted-Average Contract Price | $ / Barrels (4.44) [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,571
Derivative, Weighted-Average Contract Price | $ / Barrels (4.49) [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 3,291
Derivative, Weighted-Average Contract Price | $ / Barrels (2.86) [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Fourth Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 3,338
Derivative, Weighted-Average Contract Price | $ / Barrels (2.87) [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2020 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 11,601
Derivative, Weighted-Average Contract Price | $ / Barrels (1.03) [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2021 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 0
Derivative, Weighted-Average Contract Price | $ / Barrels 0.00 [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2022 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 0
Derivative, Weighted-Average Contract Price | $ / Barrels 0.00 [1]
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 23,234
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 0
Derivative, Weighted-Average Contract Price | $ / Barrels 0.00 [2]
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 0
Derivative, Weighted-Average Contract Price | $ / Barrels 0.00 [2]
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 0
Derivative, Weighted-Average Contract Price | $ / Barrels 0.00 [2]
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Fourth Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 0
Derivative, Weighted-Average Contract Price | $ / Barrels 0.00 [2]
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2020 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 2,750
Derivative, Weighted-Average Contract Price | $ / Barrels (8.03) [2]
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2021 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 3,650
Derivative, Weighted-Average Contract Price | $ / Barrels (7.86) [2]
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2022 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 3,650
Derivative, Weighted-Average Contract Price | $ / Barrels (7.78) [2]
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 86.00%
IF HSC [Member] | Gas Swaps Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent 2.99
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 19,805
IF HSC [Member] | Gas Swaps Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent 2.82
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 10,439
IF HSC [Member] | Gas Swaps Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent 2.82
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 12,531
IF HSC [Member] | Gas Swaps Contract Fourth Quarter 2019 [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 2020 [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 66,331 [3]
IF HSC [Member] | Gas Collar Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Floor Price | $ / EnergyContent 0.00
Derivative, Ceiling Price | $ / EnergyContent 0.00
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 0
IF HSC [Member] | Gas Collar Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Floor Price | $ / EnergyContent 2.50
Derivative, Ceiling Price | $ / EnergyContent 2.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 4,358
IF HSC [Member] | Gas Collar Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Floor Price | $ / EnergyContent 2.50
Derivative, Ceiling Price | $ / EnergyContent 2.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 5,066
IF HSC [Member] | Gas Collar Contract Fourth Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Floor Price | $ / EnergyContent 2.50
Derivative, 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 14,242
WAHA [Member] | Gas Swaps Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent 0.00
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 0
WAHA [Member] | Gas Swaps Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent 0.69
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 2,803
WAHA [Member] | Gas Swaps Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent 1.28
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU 2,984
WAHA [Member] | Gas Swaps Contract Fourth Quarter 2019 [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 2020 [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 10,809 [3]
IF Waha [Member]  
Derivative Financial Instruments  
Index percent of natural gas fixed swaps 4.00%
GD Waha [Member]  
Derivative Financial Instruments  
Index percent of natural gas fixed swaps 10.00%
OPIS Purity Ethane Mont Belvieu [Member] | NGL Swaps Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 853
Derivative, Swap Type, Average Fixed Price | $ / Barrels 12.25
OPIS Purity Ethane Mont Belvieu [Member] | NGL Swaps Contract Second Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 877
Derivative, Swap Type, Average Fixed Price | $ / Barrels 12.29
OPIS Purity Ethane Mont Belvieu [Member] | NGL Swaps Contract Third Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 907
Derivative, Swap Type, Average Fixed Price | $ / Barrels 12.34
OPIS Purity Ethane Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 896
Derivative, Swap Type, Average Fixed Price | $ / Barrels 12.36
OPIS Purity Ethane Mont Belvieu [Member] | NGL Swaps Contract 2020 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 539
Derivative, Swap Type, Average Fixed Price | $ / Barrels 11.13
OPIS Purity Ethane Mont Belvieu [Member] | NGL Swaps Contracts [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 4,072
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 540
Derivative, Swap Type, Average Fixed Price | $ / Barrels 28.72
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2019 [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 2019 [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 2019 [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 2020 [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 2,389
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2019 [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 Second Quarter 2019 [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 2019 [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 2019 [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 2020 [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 154
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2019 [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 Second Quarter 2019 [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 2019 [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 2019 [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 2020 [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 117
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2019 [Member]  
Derivative Financial Instruments  
Derivative, Nonmonetary Notional Amount, Volume 48
Derivative, Swap Type, Average Fixed Price | $ / Barrels 50.93
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2019 [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 2019 [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 2019 [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 2020 [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 197
[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 December 31, 2018, total volumes for gas swaps are comprised of 86 percent IF HSC, four percent IF Waha, and 10 percent GD Waha.