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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