Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Lease agreements [Member]	Mar. 31, 2013 Lease agreements [Member]	Dec. 31, 2013 Lease agreements [Member] Area of Land [Member] Maximum [Member] sqft
Commitments and Contingencies (Textual) [Abstract]
Office space of headquarters					40,071
Lease period	Jun. 30, 2022
Maximum termination outstanding obligations of contracts	$ 12.9
Transportation and processing fee under the agreement			1.2	0.3
Operating Leases, Rent Expense, Net	0.2	0.2
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	9.2
Minimum outstanding commitments	$ 21.2
Lease expiring period	Jun. 30, 2022