Derivatives (Details 4-Non Hedges Commodity) (Details)	Jun. 30, 2018 MMBTU BBL / Days Bbls_per_day $ / bbl $ / MMBTU
Crude Oil Three-Way Collars For Third Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	95,000
Ceiling Price	57.65
Floor Price	52.11
Sold Put Price	45.21
Crude Oil Three-Way Collars For Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	95,000
Ceiling Price	57.65
Floor Price	52.11
Sold Put Price	45.21
Crude Oil Three-Way Collars For Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days	50,000
Ceiling Price	71.74
Floor Price	56.01
Sold Put Price	48.91
Crude Oil Three-Way Collars For Year 3 [Member]
Derivative [Line Items]
Volume | BBL / Days	0
Ceiling Price	0.00
Floor Price	0.00
Sold Put Price	0.00
Crude Oil Basis Swaps For the Third Quarter of Year 1 [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 1 [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 Year 2 [Member]
Derivative [Line Items]
Volume | Bbls_per_day	10,000
Weighted Average Differential To WTI Midland and WTI Cushing	(0.82)
Crude Oil Basis Swaps For Year 3 [Member]
Derivative [Line Items]
Volume | Bbls_per_day	15,000
Weighted Average Differential To WTI Midland and WTI Cushing	(0.94)
Natural Gas Three-Way Collars For the Third Quarter of Year 1 [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 1 [Member]
Derivative [Line Items]
Volume | MMBTU	160,000
Ceiling Price | $ / MMBTU	3.61
Floor Price | $ / MMBTU	3.00
Sold Put Price | $ / MMBTU	2.50