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Hedging Activities (Schedule Of Derivative Instruments) (Details) | Dec. 31, 2012 | Jul. 31, 2012 | Feb. 29, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 28, 2010
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Derivative [Line Items] |  |  |  |  |  |
Daily Volume (Bbls/day) | 4,000 | 3,000 | 2,000 | 2,000 | 2,300 | 3,000
Fixed Price Swap, Period of January 2013 through December 2013 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Daily Volume (Bbls/day) | 5,000 |  |  |  |  |
Weighted Average Price (usd per bbl) | 100.90 |  |  |  |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
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