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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
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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

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