Derivative Financial Instruments (Details) bbl in Thousands		1 Months Ended	3 Months Ended
	Sep. 30, 2016 MMBTU $ / EnergyContent $ / Barrels bbl	Oct. 26, 2016 MMBTU $ / EnergyContent $ / Barrels bbl	Mar. 31, 2016 MMBTU $ / EnergyContent
Derivative Financial Instruments
Percentage of Proved Property Secured for Credit Facility Borrowing	90.00%
NYMEX Oil Swap Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	2,249
Derivative, Swap Type, Average Fixed Price | $ / Barrels	59.03
NYMEX Oil Swap Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	5,612
Derivative, Swap Type, Average Fixed Price | $ / Barrels	46.46
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	7,861
NYMEX Oil Collar Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	881
Derivative, Floor Price | $ / Barrels	40.00
Derivative, Cap Price | $ / Barrels	51.52
NYMEX Oil Collar Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	2,463
Derivative, Floor Price | $ / Barrels	45.00
Derivative, Cap Price | $ / Barrels	54.09
NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	3,344
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	26,700,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent	3.34
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent	0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	26,700,000
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	99,549,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent	3.94		4.43
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent	0.00
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	99,549,000
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	57,970,000
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent	3.70
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent	4.27
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	27,364,000
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)		(55,021,000)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	208,634,000
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	153,613,000
IF El Paso Permian [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	96.00%
IF NNG Ventura [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps	3.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	687
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
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
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
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
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	7,923
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	792
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	1,530
Derivative, Swap Type, Average Fixed Price | $ / Barrels	20.78
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	593
Derivative, Swap Type, Average Fixed Price | $ / Barrels	21.60
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	2,915
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	226
Derivative, Swap Type, Average Fixed Price | $ / Barrels	22.91
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	226
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2016 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	182
Derivative, Swap Type, Average Fixed Price | $ / Barrels	23.25
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	182
Subsequent Event [Member] | NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,300
Derivative, Floor Price | $ / Barrels		50.00
Subsequent Event [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,100
Subsequent Event [Member] | Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		5,400,000
Minimum [Member] | Subsequent Event [Member] | NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Cap Price | $ / Barrels		58.18
Minimum [Member] | Subsequent Event [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		13.02
Minimum [Member] | Subsequent Event [Member] | Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		3.15
Maximum [Member] | Subsequent Event [Member] | NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Cap Price | $ / Barrels		61.55
Maximum [Member] | Subsequent Event [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		47.67
Maximum [Member] | Subsequent Event [Member] | Gas Contracts [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent		3.46