Annual report pursuant to Section 13 and 15(d)

Property And Equipment (Narrative) (Details)

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Property And Equipment (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property, Plant and Equipment [Line Items]      
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool $ 23,494,000 $ 18,126,000  
Capitalized general and administrative costs 5,368,000 4,117,000 3,395,000
West Texas Permian [Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 9,831,000    
Belize Properties [Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 5,711,000    
Bakken Properties [Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 303,000    
Colorado Properties {Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 4,163,000    
Southern Louisiana Assets [Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 161,000    
Ohio Leasehold Costs [Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 118,420,000    
Other Projects [Member]
     
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization $ 34,000