Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Narrative) (Details)

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Property And Equipment (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Oct. 24, 2012
Contribution Agreement With Diamondback Energy Inc [Member]
Oct. 17, 2012
Contribution Agreement With Diamondback Energy Inc [Member]
Oct. 11, 2012
Contribution Agreement With Diamondback Energy Inc [Member]
May 07, 2012
Contribution Agreement With Diamondback Energy Inc [Member]
Property, Plant and Equipment [Line Items]                  
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool     $ 29,664,000            
Capitalized general and administrative costs 2,034,000 1,338,000 6,170,000 4,126,000          
Shares issued in exchange for contribution of oil and gas interests               7,914,036  
Non-interest bearing promissory note received in exchange for contribution of oil and gas interests               63,590,050.00  
Amount that would have been owed had Contribution not closed               16,000,000  
Minimum threshold of ownership interest for designating a nominee to serve on the board of directors                 10.00%
Long-term debt, net of current maturities $ 143,033,000   $ 143,033,000   $ 2,142,000        
Outstanding common stock prior to closing, interest percent, received in exchange for contribution of oil and gas interests                 35.00%
Ownership interest           21.40% 22.50%