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Derivatives (Schedule Of Open Forward Positions On Outstanding Put Agreements) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 bbl | Dec. 31, 2011 bbl
Derivative [Line Items] |  |
Current Asset Fair Value | 37 | 142
1st Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Current Asset Fair Value |  | 2
2nd Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Current Asset Fair Value |  | 23
3rd Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Current Asset Fair Value | 5 | 48
4th Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Current Asset Fair Value | 32 | 69
Scenario, Forecast [Member] | 1st Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Monthly Volume |  | 10,000
Total Quarterly Volume |  | 30,000
Floor NYMEX |  | 65.00
Scenario, Forecast [Member] | 2nd Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Monthly Volume |  | 10,000
Total Quarterly Volume |  | 30,000
Floor NYMEX |  | 65.00
Scenario, Forecast [Member] | 3rd Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Monthly Volume | 10,000 | 10,000
Total Quarterly Volume | 30,000 | 30,000
Floor NYMEX | 65.00 | 65.00
Scenario, Forecast [Member] | 4th Qtr 2012 [Member] |  |
Derivative [Line Items] |  |
Monthly Volume | 10,000 | 10,000
Total Quarterly Volume | 30,000 | 30,000
Floor NYMEX | 65.00 | 65.00

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- Definition Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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