Derivative Financial Instruments (Details)	Feb. 17, 2016 MMBTU $ / EnergyContent $ / Barrels bbl	Jan. 14, 2016 MMBTU $ / EnergyContent	Dec. 31, 2015 MMBTU $ / EnergyContent $ / Barrels bbl
NYMEX Oil Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			5,600,000
Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			172,700,000
NGL Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			13,000,000
NYMEX Oil Swap Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,868,000
Weighted- Average Contract Price | $ / Barrels			86.93
NYMEX Oil Swap Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,752,000
Weighted- Average Contract Price | $ / Barrels			86.73
NYMEX Oil Swap Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,170,000
Weighted- Average Contract Price | $ / Barrels			90.29
NYMEX Oil Swap Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			780,000
Weighted- Average Contract Price | $ / Barrels			90.05
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			5,570,000
Gas Swaps Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			3.82
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			23,341,000
Gas Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			3.40
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			20,780,000
Gas Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			3.38
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			18,829,000
Gas Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			3.82
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			17,236,000
Gas Swaps Contract 2017 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			4.09
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			37,528,000
Gas Swaps Contract 2018 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			4.27
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			30,606,000
Gas Swaps Contract 2019 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent			4.34
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			24,415,000
Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			172,735,000
IF El Paso Permian [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			2.00%
IF NNG Ventura [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			2.00%
IF NGPL TXOK [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			1.00%
IF HSC [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			95.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			926,000
Weighted- Average Contract Price | $ / Barrels			8.29
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			828,000
Weighted- Average Contract 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
Weighted- Average Contract 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			688,000
Weighted- Average Contract Price | $ / Barrels			8.71
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,271,000
Weighted- Average Contract Price | $ / Barrels			9.16
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,671,000
Weighted- Average Contract Price | $ / Barrels			10.65
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,200,000
Weighted- Average Contract 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
Weighted- Average Contract Price | $ / Barrels			11.13
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			8,874,000
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,059,000
Weighted- Average Contract Price | $ / Barrels			19.60
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			949,000
Weighted- Average Contract 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			862,000
Weighted- Average Contract 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			791,000
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,661,000
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			143,000
Weighted- Average Contract Price | $ / Barrels			25.62
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			130,000
Weighted- Average Contract Price | $ / Barrels			25.62
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			273,000
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			122,000
Weighted- Average Contract Price | $ / Barrels			25.87
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			111,000
Weighted- Average Contract Price | $ / Barrels			25.87
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			0
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract 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
Weighted- Average Contract Price | $ / Barrels			0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			233,000
Subsequent Event [Member] | Gas Swaps Contract First Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	3.82
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	23,341,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	23,341,000
Subsequent Event [Member] | Gas Swaps Contract Second Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	3.40
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	20,780,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
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
Subsequent Event [Member] | Gas Swaps Contract Third Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	3.38
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	18,829,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	18,829,000
Subsequent Event [Member] | Gas Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	3.82
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	17,236,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	17,236,000
Subsequent Event [Member] | Gas Swaps Contract 2017 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	4.26	4.43
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	76,135,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Sold Volumes on Subsequent Date | MMBTU		38,600,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		0
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	76,135,000
Subsequent Event [Member] | Gas Swaps Contract 2018 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	4.27
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	30,606,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		(30,606,000)
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		4.27
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	0
Subsequent Event [Member] | Gas Swaps Contract 2019 [Member]
Derivative Financial Instruments
Weighted- Average Contract Price | $ / EnergyContent	4.34
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	24,415,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		(24,415,000)
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent		4.34
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	0
Subsequent Event [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	211,342,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU		(55,021,000)
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	156,321,000
Subsequent Event [Member] | IF El Paso Permian [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps	2.00%
Subsequent Event [Member] | IF NNG Ventura [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps	1.00%
Subsequent Event [Member] | IF NGPL TXOK [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps	1.00%
Subsequent Event [Member] | IF HSC [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps	96.00%
Subsequent Event [Member] | OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,600,000
Weighted- Average Contract Price | $ / Barrels	8.67
Subsequent Event [Member] | OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	235,000
Weighted- Average Contract Price | $ / Barrels	22.58