Annual report pursuant to Section 13 and 15(d)

Commitments (Details)

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Commitments (Details) (USD $)
 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Nov. 02, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Grizzly [Member]
Oct. 05, 2012
Grizzly [Member]
Dec. 31, 2012
Minimum [Member]
Mar. 11, 1997
WCBB [Member]
wells
Dec. 31, 2012
WCBB [Member]
wells
Dec. 31, 2012
Executive Officer [Member]
Commitments [Line Items]                    
Percentage of interest in WCBB               50.00%    
Contribution to plugging and abandonment trust               $ 18,000    
Annual minimum wells to be plugged               20    
Tenure of minimum wells to be plugged, years               20 years    
Plugging and abandonment escrow account   3,113,000 3,121,000              
Number of wells plugged                 354  
Maximum annual contribution per employee (401K Plan)   100.00%                
Miminum matching employer contribution for 401k             3.00%      
Cost recognized on defined contribution plan   361,000 310,000 316,000            
Employement agreement 3 years                  
Extension period 1 year                  
Notice period 90 days                  
Other Commitment                   7,050,000
Contractual obligation for future salaries and benefits         6,300,000 8,500,000        
Contractual oblication in excess of   $ 2,000,000