Derivatives Derivatives (Details 4-Non Hedges Commodity) (Details)	Dec. 29, 2017 MMBTU_per_day $ / bbl	Oct. 31, 2017 Bbls_per_day $ / bbl	Sep. 30, 2017 MMBTU MMBTU_per_day BBL / Days Bbls_per_day $ / MMBTU $ / bbl
Crude Oil Three-Way Collars For Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days			50,000
Ceiling Price			60.37
Floor Price			54.80
Sold Put Price			47.80
Crude Oil Three-Way Collars For First Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days			75,000
Ceiling Price			56.24
Floor Price			51.33
Sold Put Price			44.73
Crude Oil Three-Way Collars For Second Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days			75,000
Ceiling Price			56.24
Floor Price			51.33
Sold Put Price			44.73
Crude Oil Three-Way Collars For Third Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days			62,000
Ceiling Price			56.08
Floor Price			50.50
Sold Put Price			43.61
Crude Oil Three-Way Collars For Fourth Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days			62,000
Ceiling Price			56.08
Floor Price			50.50
Sold Put Price			43.61
Crude Oil Swaps For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			20,000
Option Price | $ / MMBTU			51.37
Crude Oil Swaps For the First Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Crude Oil Swaps For the Second Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Crude Oil Swaps For the Third Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Crude Oil Swaps For the Fourth Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Crude Oil Options For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			35,000
Option Price			61.91
Crude Oil Options For the First Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			0
Option Price			0.00
Crude Oil Options For the Second Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			0
Option Price			0.00
Crude Oil Options For the Third Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			0
Option Price			0.00
Crude Oil Options For the Fourth Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			0
Option Price			0.00
Crude Oil Basis Swaps For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			0
Weighted Average Differential To WTI Midland and WTI Cushing			0.00
Crude Oil Basis Swaps For the First Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			5,000
Weighted Average Differential To WTI Midland and WTI Cushing			(0.60)
Crude Oil Basis Swaps For the Second Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			5,000
Weighted Average Differential To WTI Midland and WTI Cushing			(0.60)
Crude Oil Basis Swaps For the Third Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			10,000
Weighted Average Differential To WTI Midland and WTI Cushing			(0.67)
Crude Oil Basis Swaps For the Fourth Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day			10,000
Weighted Average Differential To WTI Midland and WTI Cushing			(0.67)
Natural Gas Three-Way Collars For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | MMBTU			120,000
Ceiling Price | $ / MMBTU			3.71
Floor Price | $ / MMBTU			3.14
Sold Put Price | $ / MMBTU			2.60
Natural Gas Three-Way Collars For the First Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU			200,000
Ceiling Price | $ / MMBTU			3.79
Floor Price | $ / MMBTU			3.08
Sold Put Price | $ / MMBTU			2.55
Natural Gas Three-Way Collars For the Second Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU			160,000
Ceiling Price | $ / MMBTU			3.61
Floor Price | $ / MMBTU			3.00
Sold Put Price | $ / MMBTU			2.50
Natural Gas Three-Way Collars For the Third Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU			160,000
Ceiling Price | $ / MMBTU			3.61
Floor Price | $ / MMBTU			3.00
Sold Put Price | $ / MMBTU			2.50
Natural Gas Three-Way Collars For the Fourth Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU			160,000
Ceiling Price | $ / MMBTU			3.61
Floor Price | $ / MMBTU			3.00
Sold Put Price | $ / MMBTU			2.50
Natural Gas Swaps For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			20,000
Option Price | $ / MMBTU			2.93
Natural Gas Swaps For the First Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Natural Gas Swaps For the Second Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Natural Gas Swaps For the Third Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Natural Gas Swaps For the Fourth Quarter of Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day			0
Option Price | $ / MMBTU			0.00
Subsequent Event [Member] | Crude Oil Three-Way Collars for July - December 2018 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		10,000
Ceiling Price		58.07
Floor Price		53.70
Sold Put Price		47.00
Subsequent Event [Member] | Crude Oil Fixed-Price Swap for November - December 2017 [Member]
Derivative [Line Items]
Volume | Bbls_per_day		40,000
Option Price		54.11
Scenario, Forecast [Member] | Crude Oil Swaps For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day	10,000
Option Price	52.67