Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 sqft acre well	Dec. 31, 2012	Dec. 31, 2011	Aug. 01, 2012 acre	May 15, 2008
Long-term Purchase Commitment [Line Items]
Effective base rent per square foot per year	20.28
Rent expense, including fees for operating expenses and consumption of electricity	$ 0.8	$ 0.6	$ 0.5
Effective date of which company entered into agreement	Sep. 01, 2012
Natural gas processing and transportation agreement	5 years
Minimum delivery commitment to avoid paying gas deficiency fee	80.00%
Transportation and processing fees under the agreement	5.3	0.3
Term of new contract drilling rig	1 year
Maximum termination outstanding obligations of contracts	9.9
Minimum outstanding commitments	5.7
Issue on the deep rights below the Cotton Valley formation	1,805
Right to participate in working capital	25.00%
Company's total revenue and overriding royalty interests on the acreage range Minimum	2.00%
Company's total revenue and overriding royalty interests on the acreage range Maximum	23.00%
Loss contingency, lawsuit filing date	May 15, 2008
Royalty owner undivided interest in mineral					16.70%
Acres reformed by court				169
Rights on remaining acres				1,636
Percentage of Costs Assumed	100.00%
Wells in Process of Drilling	2
Amount Of Remittance On Success Of Legal Disputes	$ 8.7
Lease agreements [Member]
Long-term Purchase Commitment [Line Items]
Office space of headquarters	40,071
Orca [Member]
Long-term Purchase Commitment [Line Items]
Working Interest Percentage	50.00%
Working Interest Percentage, Post Well Cost Recovery	25.00%