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Hedging Activities (Schedule Of Derivative Instruments) (Details)
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Dec. 31, 2012
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Jul. 31, 2012
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Feb. 29, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Feb. 28, 2010
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Mar. 31, 2013
Fixed Price Swap, Period of April through June 2013 [Member]
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Dec. 31, 2012
Fixed Price Swap, Period of January 2013 through December 2013 [Member]
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Mar. 31, 2013
Fixed Price Swap Period Of July to December 2013 [Member]
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| Derivative [Line Items] | |||||||||
| Daily Volume (Bbls/day) | 4,000 | 3,000 | 2,000 | 2,000 | 2,300 | 3,000 | 5,000 | 5,000 | 5,000 |
| Weighted Average Price (usd per bbl) | 101.96 | 100.90 | 99.86 |
| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Average fixed price related to the group of price risk swap derivatives. No definition available.
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