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Derivative Financial Instruments (Details) | Oct. 21, 2015 $ / Barrels bbl | Sep. 30, 2015 MMBTU $ / EnergyContent $ / Barrels bbl
--- | --- | ---
Crude oil |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 7,600,000
Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Portion of Gas Production Being Hedged | MMBTU |  | 190,400,000
Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 13,700,000
Swap | Crude oil |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 6,707,000
Swap | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Portion of Gas Production Being Hedged | MMBTU |  | 185,233,000
Collar [Member] | Crude oil |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 869,000
Collar [Member] | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Portion of Gas Production Being Hedged | MMBTU |  | 5,157,000
Fourth Quarter Current Year [Member] | Swap | Crude oil |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 1,137,000
Weighted-Average Contract Price | $ / Barrels |  | 90.15
Fourth Quarter Current Year [Member] | Swap | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Weighted-Average Contract Price | $ / EnergyContent |  | 4.01
Portion of Gas Production Being Hedged | MMBTU |  | 12,499,000
Fourth Quarter Current Year [Member] | Collar [Member] | Crude oil |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 869,000
Weighted-Average Floor Price | $ / Barrels |  | 85.00
Weighted-Average Ceiling Price | $ / Barrels |  | 92.19
Fourth Quarter Current Year [Member] | Collar [Member] | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Portion of Gas Production Being Hedged | MMBTU |  | 5,157,000
Weighted-Average Floor Price | $ / EnergyContent |  | 3.99
Weighted-Average Ceiling Price | $ / EnergyContent |  | 4.29
2016 [Member] | Swap | Crude oil |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 5,570,000
Weighted-Average Contract Price | $ / Barrels |  | 88.01
2016 [Member] | Swap | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Weighted-Average Contract Price | $ / EnergyContent |  | 3.61
Portion of Gas Production Being Hedged | MMBTU |  | 80,186,000
2017 [Member] | Swap | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Weighted-Average Contract Price | $ / EnergyContent |  | 4.09
Portion of Gas Production Being Hedged | MMBTU |  | 37,527,000
2018 [Member] | Swap | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Weighted-Average Contract Price | $ / EnergyContent |  | 4.27
Portion of Gas Production Being Hedged | MMBTU |  | 30,606,000
2019 [Member] | Swap | Natural Gas [Member] |  |
Derivative Financial Instruments |  |
Weighted-Average Contract Price | $ / EnergyContent |  | 4.34
Portion of Gas Production Being Hedged | MMBTU |  | 24,415,000
IF NNG Ventura [Member] |  |
Derivative Financial Instruments |  |
Index percent of natural gas fixed swaps |  | 2.00%
Index percent of natural gas collars |  | 5.00%
IF HSC [Member] |  |
Derivative Financial Instruments |  |
Index percent of natural gas fixed swaps |  | 95.00%
Index percent of natural gas collars |  | 89.00%
IF NGPL TXOK [Member] |  |
Derivative Financial Instruments |  |
Index percent of natural gas fixed swaps |  | 1.00%
IF El Paso Permian [Member] |  |
Derivative Financial Instruments |  |
Index percent of natural gas fixed swaps |  | 2.00%
Index percent of natural gas collars |  | 6.00%
OPIS Normal Butane Mont Belvieu Non-TET [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 595,000
OPIS Normal Butane Mont Belvieu Non-TET [Member] | Fourth Quarter Current Year [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 322,000
Weighted-Average Contract Price | $ / Barrels |  | 24.90
OPIS Normal Butane Mont Belvieu Non-TET [Member] | 2016 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 273,000
Weighted-Average Contract Price | $ / Barrels |  | 25.62
OPIS Normal Butane Mont Belvieu Non-TET [Member] | 2017 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | 2018 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | 2019 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | 2020 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Ethane Purity Mont Belvieu [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 8,874,000
OPIS Ethane Purity Mont Belvieu [Member] | Fourth Quarter Current Year [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Ethane Purity Mont Belvieu [Member] | 2016 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 3,193,000
Weighted-Average Contract Price | $ / Barrels |  | 8.47
OPIS Ethane Purity Mont Belvieu [Member] | 2017 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 2,271,000
Weighted-Average Contract Price | $ / Barrels |  | 9.16
OPIS Ethane Purity Mont Belvieu [Member] | 2018 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 1,671,000
Weighted-Average Contract Price | $ / Barrels |  | 10.65
OPIS Ethane Purity Mont Belvieu [Member] | 2019 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 1,200,000
Weighted-Average Contract Price | $ / Barrels |  | 10.92
OPIS Ethane Purity Mont Belvieu [Member] | 2020 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 539,000
Weighted-Average Contract Price | $ / Barrels |  | 11.13
OPIS Propane Mont Belvieu Non-TET [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 3,687,000
OPIS Propane Mont Belvieu Non-TET [Member] | Fourth Quarter Current Year [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 941,000
Weighted-Average Contract Price | $ / Barrels |  | 19.60
OPIS Propane Mont Belvieu Non-TET [Member] | 2016 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 2,746,000
Weighted-Average Contract Price | $ / Barrels |  | 19.09
OPIS Propane Mont Belvieu Non-TET [Member] | 2017 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Propane Mont Belvieu Non-TET [Member] | 2018 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Propane Mont Belvieu Non-TET [Member] | 2019 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Propane Mont Belvieu Non-TET [Member] | 2020 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 509,000
OPIS Isobutane Mont Belvieu Non-TET [Member] | Fourth Quarter Current Year [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 276,000
Weighted-Average Contract Price | $ / Barrels |  | 25.30
OPIS Isobutane Mont Belvieu Non-TET [Member] | 2016 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 233,000
Weighted-Average Contract Price | $ / Barrels |  | 25.87
OPIS Isobutane Mont Belvieu Non-TET [Member] | 2017 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | 2018 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | 2019 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | 2020 [Member] | Swap | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged |  | 0
Weighted-Average Contract Price | $ / Barrels |  | 0.00
Subsequent Event [Member] | Natural Gas Liquids [Member] |  |
Derivative Financial Instruments |  |
Portion of Future Oil and Gas Production Being Hedged | 886,000 |
Weighted-Average Contract Price | $ / Barrels | 20.16 |
Revolving Credit Facility [Member] |  |
Derivative Financial Instruments |  |
Percentage of Proved Property Secured for Credit Facility Borrowing |  | 75.00%

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