Derivative Financial Instruments (Details) bbl in Thousands, MMBTU in Thousands					12 Months Ended
		Aug. 01, 2017 $ / Barrels bbl	Jun. 30, 2017 MMBTU $ / EnergyContent $ / Barrels bbl		Dec. 31, 2016 MMBTU $ / EnergyContent
NYMEX Oil Swap Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,340
Derivative, Swap Type, Average Fixed Price | $ / Barrels			46.66
NYMEX Oil Swap Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,254
Derivative, Swap Type, Average Fixed Price | $ / Barrels			46.35
NYMEX Oil Swap Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,493
Derivative, Swap Type, Average Fixed Price | $ / Barrels			46.82
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			4,087
NYMEX Oil Collar Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			583
Derivative, Floor Price | $ / Barrels			45.00
Derivative, Cap Price | $ / Barrels			54.05
NYMEX Oil Collar Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,086
Derivative, Floor Price | $ / Barrels			47.51
Derivative, Cap Price | $ / Barrels			56.05
NYMEX Oil Collar Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			5,030
Derivative, Floor Price | $ / Barrels			50.00
Derivative, Cap Price | $ / Barrels			58.07
NYMEX Oil Collar Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,128
Derivative, Floor Price | $ / Barrels			50.00
Derivative, Cap Price | $ / Barrels			58.84
NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			9,827
Oil Basis Swap Contract Third Quarter 2017 [Domain]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			566
Derivative, Swap Type, Average Fixed Price | $ / Barrels	[1]		(1.62)
Oil Basis Swap Contract Fourth Quarter 2017 [Domain]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			1,798
Derivative, Swap Type, Average Fixed Price | $ / Barrels	[1]		(1.52)
Oil Basis Swap Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			6,868
Derivative, Swap Type, Average Fixed Price | $ / Barrels	[1]		(1.39)
Oil Basis Swap Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,963
Derivative, Swap Type, Average Fixed Price | $ / Barrels	[1]		(1.45)
Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			13,195
Gas Swaps Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			4.01
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			23,657
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			23,657
Gas Swaps Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			3.98
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			22,001
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			22,001
Gas Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			3.41
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			93,014
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU	[2]		(30,606)
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent			4.27
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU			62,408
Gas Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			3.76
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU			41,394
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU	[2]		(24,415)
Derivative, Swap Type, Average Fixed Price, Purchased Volumes | $ / EnergyContent			4.34
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU			16,979
Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	[3]		180,066
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | MMBTU			(55,021)	[2],[3]	(55,021)
Derivative, Nonmonetary Notional Amount, Energy Measure, Net of Purchased Volumes | MMBTU	[3]		125,045
Gas Swaps Contract 2017 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent					4.43
Derivative, Nonmonetary Notional Amount, Energy Measure, Sold Volumes | MMBTU					38,600
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			97.00%
IF NNG Ventura [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps			2.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			906
Derivative, Swap Type, Average Fixed Price | $ / Barrels			9.48
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			966
Derivative, Swap Type, Average Fixed Price | $ / Barrels			9.65
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			4,017
Derivative, Swap Type, Average Fixed Price | $ / Barrels			11.00
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			3,112
Derivative, Swap Type, Average Fixed Price | $ / Barrels			12.27
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			9,540
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			588
Derivative, Swap Type, Average Fixed Price | $ / Barrels			21.91
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			550
Derivative, Swap Type, Average Fixed Price | $ / Barrels			21.91
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			2,021
Derivative, Swap Type, Average Fixed Price | $ / Barrels			23.38
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			214
Derivative, Swap Type, Average Fixed Price | $ / Barrels			22.66
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			3,373
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			163
Derivative, Swap Type, Average Fixed Price | $ / Barrels			32.42
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			149
Derivative, Swap Type, Average Fixed Price | $ / Barrels			32.34
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			225
Derivative, Swap Type, Average Fixed Price | $ / Barrels			33.99
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			537
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			140
Derivative, Swap Type, Average Fixed Price | $ / Barrels			33.28
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			128
Derivative, Swap Type, Average Fixed Price | $ / Barrels			33.23
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			188
Derivative, Swap Type, Average Fixed Price | $ / Barrels			33.56
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			456
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			222
Derivative, Swap Type, Average Fixed Price | $ / Barrels			48.43
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2017 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			203
Derivative, Swap Type, Average Fixed Price | $ / Barrels			48.41
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume			305
Derivative, Swap Type, Average Fixed Price | $ / Barrels			48.62
OPIS Natural Gasoline 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 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			730
Subsequent Event [Member] | NYMEX Oil Swap Contract 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,979
Derivative, Swap Type, Average Fixed Price | $ / Barrels		50.37

[1] Represents the price differential between WTI prices at Midland, Texas and WTI prices at Cushing, Oklahoma.

[2] During 2016, the Company restructured certain of its natural gas derivative contracts by buying fixed price volumes to offset existing 2018 and 2019 fixed price swap contracts totaling 55.0 million MMBtu. The Company then entered into new 2017 fixed price swap contracts totaling 38.6 million MMBtu with a contract price of $4.43 per MMBtu. No other cash or other consideration was included as part of the restructuring.

[3] Total net volumes of natural gas swaps are comprised of IF El Paso Permian (1%), IF HSC (97%), and IF NNG Ventura (2%).