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Supplemental Oil And Gas Disclosures (Estimated Quantities Of Proved Oil And Gas Reserves) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 bbl item | Dec. 31, 2011 bbl | Dec. 31, 2010 bbl | Dec. 31, 2009 bbl
Reserve Quantities [Line Items] |  |  |  |
Total proved reserves, beginning balance | 38,860,000 | 62,696,000 | 96,280,000 |
Revision of previous estimates | (1,508,000) | (14,683,000) | (25,714,000) |
Production | (6,619,000) | (8,694,000) | (7,870,000) |
Sales of reserves in place | (654,000) | (890,000) |  |
Extensions and discoveries | 2,105,000 | 431,000 |  |
Total proved reserves, ending balance | 32,184,000 | 38,860,000 | 62,696,000 |
Total proved developed reserves | 19,677,000 | 22,731,000 | 24,407,000 | 35,644,000
Percentage of dosmetic significant oil and gas fields analyzed | 100.00% |  |  |
Number of dosmetic significant oil and gas fields analyzed | 40 |  |  |
Percentage benchmark discounted future net revenues | 1.00% |  |  |
Oil [Member] |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Total proved reserves, beginning balance | 22,689,000 | 24,818,000 | 29,727,000 |
Revision of previous estimates | 647,000 | 3,475,000 | (1,555,000) |
Production | (4,725,000) | (5,785,000) | (3,354,000) |
Sales of reserves in place | (75,000) | (205,000) |  |
Extensions and discoveries | 1,434,000 | 386,000 |  |
Total proved reserves, ending balance | 19,970,000 | 22,689,000 | 24,818,000 |
Total proved developed reserves | 12,431,000 | 12,754,000 | 11,796,000 | 14,850,000
Natural Gas Liquids [Member] |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Total proved reserves, beginning balance | 97,021,000,000 | 227,264,000,000 | 399,315,000,000 |
Revision of previous estimates | (12,926,000,000) | (108,947,000,000) | (144,954,000,000) |
Production | (11,361,000,000) | (17,458,000,000) | (27,097,000,000) |
Sales of reserves in place | (3,473,000,000) | (4,109,000,000) |  |
Extensions and discoveries | 4,026,000,000 | 271,000,000 |  |
Total proved reserves, ending balance | 73,287,000,000 | 97,021,000,000 | 227,264,000,000 |
Total proved developed reserves | 43,475,000,000 | 59,859,000,000 | 75,664,000,000 | 124,763,000,000
Camelot Field [Member] |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Total proved reserves, beginning balance |  |  |  | 12,000,000,000
Total proved reserves, ending balance |  |  |  | 12,000,000,000
Bushwood Field [Member] | Oil [Member] |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revision of previous estimates |  |  | 1,800,000 |
Bushwood Field [Member] | Natural Gas Liquids [Member] |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revision of previous estimates |  | 87,000,000,000 | 131,000,000,000 |

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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -Subparagraph d -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. + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 2 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -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. + Details
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- Definition Production of proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -Subparagraph e -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. + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -Subparagraph a -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. + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447 + Details
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