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 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Diamondback [Member]
member_of_board_of_directors
advisor
Oct. 23, 2012
Diamondback [Member]
Oct. 17, 2012
Diamondback [Member]
Oct. 11, 2012
Diamondback [Member]
May 07, 2012
Diamondback [Member]
Jan. 31, 2013
Diamondback [Member]
Accounts Receivable - Related Party [Member]
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Maximum [Member]
Property, Plant and Equipment [Line Items]                      
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool $ 35,500,000                    
Capitalized general and administrative costs 2,900,000 2,000,000                  
Capitalized costs of oil and natural gas properties excluded from amortization 869,879,000 626,295,000 626,300,000                
Expected number of years amortization will commence                   3 years 5 years
Investment (shares)             7,914,036        
Promissory note receivable             63,600,000        
Payment received from Diamondback $ (3,592,000) $ 1,718,000             $ 18,600,000    
Ownership requirement to meet agreement       10.00%              
Number of directors allowed to serve on Board       1              
Number of advisors allowed to serve on Board       1              
Ownership interest         21.40% 22.50%   35.00%