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Derivatives (Schedule Of Open Forward Positions On Outstanding Put Agreements) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 1st Qtr 2012 [Member] | Dec. 31, 2011 2nd Qtr 2012 [Member] | Dec. 31, 2011 3rd Qtr 2012 [Member] | Dec. 31, 2011 4th Qtr 2012 [Member] | Dec. 31, 2011 Scenario, Forecast [Member] 1st Qtr 2012 [Member] bbl | Dec. 31, 2011 Scenario, Forecast [Member] 2nd Qtr 2012 [Member] bbl | Dec. 31, 2011 Scenario, Forecast [Member] 3rd Qtr 2012 [Member] bbl | Dec. 31, 2011 Scenario, Forecast [Member] 4th Qtr 2012 [Member] bbl
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Monthly Volume |  |  |  |  |  |  | 10,000 | 10,000 | 10,000 | 10,000
Total Quarterly Volume |  |  |  |  |  |  | 30,000 | 30,000 | 30,000 | 30,000
Floor NYMEX |  |  |  |  |  |  | 65.00 | 65.00 | 65.00 | 65.00
Current Asset Fair Value |  | $ 142 | $ 2 | $ 23 | $ 48 | $ 69 |  |  |  |

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