Commitments and Contingencies (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Oct. 01, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commitments and Contingencies (Textual) [Abstract]
Natural gas processing and transportation agreement	15 years			5 years
Minimum delivery commitment to avoid paying gas deficiency fee				80.00%
Undiscounted minimum commitments		$ 2.1		$ 2.1
Transportation and processing fee under the agreement		0.8	$ 1.4	1.7	$ 2.7
Drilling Rig Commitments
Commitments and Contingencies (Textual) [Abstract]
Maximum termination outstanding obligations of contracts		43.0		43.0
Construction Contracts
Commitments and Contingencies (Textual) [Abstract]
Maximum termination outstanding obligations of contracts		4.6		4.6
Payments made under contract		4.3		17.8
Outside Operated Drilling Commitments
Commitments and Contingencies (Textual) [Abstract]
Minimum outstanding commitments		4.2		4.2
Loving County System Agreement
Commitments and Contingencies (Textual) [Abstract]
Deficiency fee required to be paid				8.5
Transportation and processing fee under the agreement		$ 2.8		$ 4.7
Term Of Old Contract Drilling Rig
Commitments and Contingencies (Textual) [Abstract]
Purchase Commitment, Description				1 year