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WELLS FARGO RESERVE CREDIT FACILITY (Details) (Senior Secured Revolving Credit Facility [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Jul. 30, 2010
Line of Credit Facility [Line Items]    
Borrowing capacity $ 100  
Expiration date of senior credit facility Jul. 30, 2014  
Borrowing base 30 12
Percentage of outstanding loans and loan commitments held by lenders required, minimum (in hundredths) 67.00%  
Maturity term of senior credit facility 6 months  
Commitment fee percentage (in hundredths) 0.50%  
Principal negative financial covenants The principal negative financial covenants (measured at various times as provided in the Credit Agreement) do not permit (i) the Interest Coverage Ratio (Interest Expense to EBITDAX) to be less than 3.0 to 1; (ii) Total Debt to EBITDAX to be greater than 3.5 to 1; and (iii) the Current Ratio (current assets plus unused lender commitments under the Borrowing Base) to be less than 1.0 to 1.0.  
Minimum Interest Coverage Ratio 3.0  
Maximum Total Debt to EBITDAX ratio 3.5  
Minimum Current Ratio 1.0  
Amount borrowed $ 10  
Federal Funds Effective Rate [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (in hundredths) 0.50%  
LIBO rate for the three prior months [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (in hundredths) 2.25%  
LIBO rate for the three prior months [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (in hundredths) 3.25%