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Supplemental Oil And Gas Disclosures (Results Of Operations For Oil And Gas Producing Activities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |
Revenues | $ 696,607 |  | $ 425,369 |  | $ 385,338 |
Production (lifting) costs | 180,243 |  | 135,685 |  | 119,836 |
Hurricane repair expense | (4,838) |  | 4,699 |  | (23,332) |
Exploration expenses | 10,914 | [1] | 8,276 | [1] | 24,383 | [1]
Depreciation, depletion, amortization and accretion | 219,915 |  | 235,290 |  | 169,256 |
Proved property impairment charges and other | 133,406 | [2] | 182,133 | [2] | 73,407 | [2]
Gain on sale or acquisition of oil and gas properties | (4,531) |  | (6,246) |  | (1,949) |
Gain on oil and gas derivative contracts |  |  | (1,088) |  | (89,485) |
Selling and administrative expenses | 31,562 |  | 26,826 |  | 21,554 |
Pretax income (loss) from producing activities | 129,936 |  | (160,206) |  | 91,668 |
Income tax expense (benefit) | 35,858 |  | (62,954) |  | 23,252 |
Results of oil and gas producing activities | 94,078 | [3] | (97,252) | [3] | 68,416 | [3]
United States [Member] |  |  |  |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |
Revenues | 696,607 |  | 425,369 |  | 384,375 |
Production (lifting) costs | 176,269 |  | 131,156 |  | 117,565 |
Hurricane repair expense | (4,838) |  | 4,699 |  | (23,332) |
Exploration expenses | 10,914 | [1] | 8,276 | [1] | 24,383 | [1]
Depreciation, depletion, amortization and accretion | 219,915 |  | 235,243 |  | 167,812 |
Proved property impairment charges and other | 113,439 | [2] | 177,138 | [2] | 73,407 | [2]
Gain on sale or acquisition of oil and gas properties | (4,531) |  | (287) |  | (1,949) |
Gain on oil and gas derivative contracts |  |  | (1,088) |  | (89,485) |
Selling and administrative expenses | 31,455 |  | 26,714 |  | 21,495 |
Pretax income (loss) from producing activities | 153,984 |  | (156,482) |  | 94,479 |
Income tax expense (benefit) | 45,233 |  | (62,526) |  | 24,280 |
Results of oil and gas producing activities | 108,751 | [3] | (93,956) | [3] | 70,199 | [3]
United Kingdom [Member] |  |  |  |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |
Revenues |  |  |  |  | 963 |
Production (lifting) costs | 3,974 |  | 4,529 |  | 2,271 |
Depreciation, depletion, amortization and accretion |  |  | 47 |  | 1,444 |
Proved property impairment charges and other | 19,967 | [2] | 4,995 | [2] |  |
Gain on sale or acquisition of oil and gas properties |  |  | (5,959) |  |  |
Selling and administrative expenses | 107 |  | 112 |  | 59 |
Pretax income (loss) from producing activities | (24,048) |  | (3,724) |  | (2,811) |
Income tax expense (benefit) | (9,375) |  | (428) |  | (1,028) |
Results of oil and gas producing activities | $ (14,673) | [3] | $ (3,296) | [3] | $ (1,783) | [3]
[1] | See Note 5 for additional information related to the components of our exploration costs, including impairment charges for expiring unproved leases.
[2] | Other amounts represent additional asset retirement expense recorded upon completion of a field's abandonment.
[3] | Excludes net interest expense and other.

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: 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)(15)) -URI http://asc.fasb.org/extlink&oid=6949603&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-OGP -Chapter 2 -Paragraph 48 -IssueDate 2006-05-01 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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- Definition Other costs for oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59S -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 Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e62136-109447 + Details
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- Definition General and administrative costs from oil & gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59S -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 Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e62299-109447 + Details
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