Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Commitments and Contingencies (Textual) [Abstract]
Maximum termination outstanding obligations of contracts	$ 54.7		$ 54.7
Commitments and Contingencies (Additional Textual) [Abstract]
Natural gas processing and transportation agreement			5 years
Minimum delivery commitment to avoid paying gas deficiency fee			80.00%
Undiscounted minimum commitments	8.0		8.0
Lease expiring period	Jun. 30, 2022
Lease agreements [Member]
Commitments and Contingencies (Textual) [Abstract]
Transportation and processing fee under the agreement	1.7	1.0	2.8	1.8
Drilling Rig Commitments [Member]
Commitments and Contingencies (Textual) [Abstract]
Minimum outstanding commitments	30.3		30.3
Geological and Geophysical Commitments [Member]
Commitments and Contingencies (Textual) [Abstract]
Minimum outstanding commitments	$ 4.1		$ 4.1