Derivative Financial Instruments (Details)	May. 04, 2016 MMBTU $ / EnergyContent $ / Barrels bbl	Mar. 31, 2016 MMBTU $ / EnergyContent $ / Barrels bbl	Jan. 14, 2016 MMBTU $ / EnergyContent
NYMEX Oil Swap Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,752,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		86.73
NYMEX Oil Swap Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,840,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		71.80
NYMEX Oil Swap Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,399,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		67.73
NYMEX Oil Swap Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		2,035,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		44.84
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		7,026,000
Gas Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		20,780,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		3.40
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		20,780,000
Gas Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		18,830,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		3.38
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		18,830,000
Gas Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		18,988,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		3.69
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		18,988,000
Gas Swaps Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Nonmonetary Notional Amount, Energy Measure, Sold Volumes | MMBTU			38,600,000
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		85,019,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		4.09	4.43
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		85,019,000
Gas Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		(30,606,000)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		30,606,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		4.27
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		4.27
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		0
Gas Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		(24,415,000)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		24,415,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		4.34
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		4.34
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		0
Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		(55,021,000)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		198,638,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU		143,617,000
IF El Paso Permian [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		2.00%
IF HSC [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		97.00%
IF NNG Ventura [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		1.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		828,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		8.28
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		751,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		8.70
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		687,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		8.71
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,062,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		8.92
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		2,435,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		10.18
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,200,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		10.92
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		539,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		11.13
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		9,502,000
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		949,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		19.64
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		863,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		19.03
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		792,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		18.53
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2017 [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 Contract 2018 [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 Contract 2019 [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 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		2,604,000
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		208,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		24.02
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		186,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		21.86
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		170,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		21.86
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2017 [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 Contract 2018 [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 Contract 2019 [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 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		564,000
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		174,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		24.68
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		155,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		22.42
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		141,000
Derivative, Swap Type, Average Fixed Price | $ / Barrels		22.42
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2017 [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 Contract 2018 [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 Contract 2019 [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 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		470,000
Subsequent Event [Member] | NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	2,668,000
Subsequent Event [Member] | NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,018,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent	47.15
Subsequent Event [Member] | Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	37,900,000
Minimum [Member] | Subsequent Event [Member] | NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Floor Price | $ / Barrels	40.00
Derivative, Cap Price | $ / Barrels	50.35
Minimum [Member] | Subsequent Event [Member] | Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent	2.36
Maximum [Member] | Subsequent Event [Member] | NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Floor Price | $ / Barrels	45.00
Derivative, Cap Price | $ / Barrels	52.85
Maximum [Member] | Subsequent Event [Member] | Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent	3.19