Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Narrative) (Details)

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Acquisitions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 10, 2011
Fairway Properties [Member]
May 11, 2011
Yellow Rose Properties [Member]
acre
Mar. 31, 2012
Fairway And Yellow Rose Properties [Member]
Business Acquisition [Line Items]      
Number of acres of oil and gas leasehold interests acquired, gross   24,500  
Number of acres of oil and gas leasehold interests acquired, net   21,900  
Percentage of working interest include in producing interest 64.30%    
Business acquisition, pro forma revenue     $ 27.4
Business acquisition, pro forma net income (Loss)     $ 4.7