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Supplemental Oil And Gas Information (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2015 $ / bbl | Dec. 31, 2014 item $ / bbl | Dec. 31, 2013 $ / bbl
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Proved undeveloped reserve locations | item |  | 27 |
Barrel Of Oil [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Price | $ / bbl | 43.98 | 88.34 | 90.11

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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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