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Acquisitions and Divestitures (Details) (USD $)
 6 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jan. 21, 2014
acre
May 07, 2014
Farm in Acreage [Member]
Wells
May 07, 2014
South Texas Based Oil and Gas Company [Member]
May 07, 2014
Dimmit County [Member]
acre
May 07, 2014
Dimmit County [Member]
Primary Leasehold Acreage [Member]
acre
May 07, 2014
Dimmit County [Member]
Farm in Acreage [Member]
acre
Jul. 23, 2013
Farmor [Member]
May 07, 2014
Farmor [Member]
Wells
Jun. 30, 2014
Williams and McKenzie Counties [Member]
May 27, 2014
Williams and McKenzie Counties [Member]
acre
Acquisitions and Divestitures [Line Items]                        
Percentage interest acquired (in hundredths)     50.00%   33.00%              
Gross acres acquired in acquisition (in acres)     160     12,100 4,020 8,080       16
Net acres acquired in acquisition (in acres)           3,384 1,181 2,203       0.62
Initial well commitment       2                
Number of developed wells in which our original working interest is retained                   10    
Minimum percentage of net revenue interest in lease owned (in hundredths)       12.50%                
Percentage payout of all costs (in hundredths)         100.00%              
Percentage of working interest retained (in hundredths)                 25.00%      
Expected net revenue interests in new wells after sale         115.00%              
Cost of acquisition         $ 3,900,000              
Net proceeds on transaction                     12,200,000  
Adjustment related to revenue                     681,000  
Proceeds from sale of assets held for sale $ 28,000 $ 2,577,000                 $ 11,500,000  
Net sales of acres (in acres)                       285.7