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Oil and Gas Exploration and Production Industries Disclosures, Costs Incurred (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition Costs of Properties - Proved | $ 739,000 | $ 4,247,000 | $ 0
Acquisition Costs of Properties - Unproved | 505,303,000 | 300,772,000 | 417,358,000
Exploration Costs | 445,598,000 | 363,554,000 | 603,153,000
Development Costs | 6,116,550,000 | 5,930,591,000 | 4,437,994,000
Total | 7,068,190,000 | 6,599,164,000 | 5,458,505,000
United States [Member] |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition Costs of Properties - Proved | 739,000 | 4,219,000 | 0
Acquisition Costs of Properties - Unproved | 471,345,000 | 295,160,000 | 403,509,000
Exploration Costs | 333,534,000 | 311,369,000 | 454,379,000
Development Costs | 5,657,378,000 | 5,410,378,000 | 3,892,403,000
Total | 6,462,996,000 | 6,021,126,000 | 4,750,291,000
Asset Retirement Costs Included In Development | 80,000,000 | 52,000,000 | 71,000,000
Canada [Member] |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition Costs of Properties - Proved | 0 | 28,000 | 0
Acquisition Costs of Properties - Unproved | 33,561,000 | 6,216,000 | 13,956,000
Exploration Costs | 38,530,000 | 31,472,000 | 38,604,000
Development Costs | 278,995,000 | 302,564,000 | 417,176,000
Total | 351,086,000 | 340,280,000 | 469,736,000
Asset Retirement Costs Included In Development | 33,000,000 | 70,000,000 | 2,000,000
Trinidad [Member] |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition Costs of Properties - Proved | 0 | 0 | 0
Acquisition Costs of Properties - Unproved | 1,000,000 | 0 | 0
Exploration Costs | 19,555,000 | 2,549,000 | 23,386,000
Development Costs | 32,609,000 | 138,905,000 | 114,986,000
Total | 53,164,000 | 141,454,000 | 138,372,000
Asset Retirement Costs Included In Development | 2,000,000 | 7,000,000 | (3,000,000)
Other International [Member] |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition Costs of Properties - Proved | 0 | 0 | 0
Acquisition Costs of Properties - Unproved | (603,000) | (604,000) | (107,000)
Exploration Costs | 53,979,000 | 18,164,000 | 86,784,000
Development Costs | 147,568,000 | 78,744,000 | 13,429,000
Total | 200,944,000 | 96,304,000 | 100,106,000
Asset Retirement Costs Included In Development | $ 12,000,000 | $ 4,000,000 | $ 2,000,000

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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59Q -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 19 -Paragraph 15 -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 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59P -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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