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Supplemental Oil And Gas Information (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Barrel Of Oil [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Price | 88.08 | 88.53 | 72.30
MCF Of Gas [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Price | 2.76 | 4.16 | 4.89

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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 3 -Subparagraph A + Details
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