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Supplemental Oil And Gas Information (Schedule Of Reserve Value By Category And The Respective Present Values, Before Income Taxes, Discounted At 10% As A Percentage Of Total Proved Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reserve Quantities [Line Items]      
Total proved reserves year-end reserve report $ 53,911 $ 69,763 $ 48,344
Proved developed producing reserves (PDP) 42,626 46,621 28,987
% of PDP reserves to total proved reserves 79.00% 67.00% 60.00%
Proved developed non-producing reserves 3,234 3,977 7,476
% of PDNP reserves to total proved reserves 6.00% 6.00% 15.00%
Proved undeveloped reserves (PUD) 8,051 19,165 11,881
% of PUD reserves to total proved reserves 15.00% 27.00% 25.00%
Oil [Member]
      
Reserve Quantities [Line Items]      
Total proved reserves year-end reserve report 53,906 69,748 48,331
Proved developed producing reserves (PDP) 42,621 46,606 28,974
% of PDP reserves to total proved reserves 79.00% 67.00% 60.00%
Proved developed non-producing reserves 3,234 3,977 7,476
% of PDNP reserves to total proved reserves 6.00% 6.00% 15.00%
Proved undeveloped reserves (PUD) 8,051 19,165 11,881
% of PUD reserves to total proved reserves 15.00% 27.00% 25.00%
Gas [Member]
      
Reserve Quantities [Line Items]      
Total proved reserves year-end reserve report 5 15 13
Proved developed producing reserves (PDP) $ 5 $ 15 $ 13