v2.4.0.6

Oil and Gas Exploration and Production Industries Disclosures, Results Of Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | $ 7,958,376 | $ 6,858,188 | $ 4,881,215
Other | 41,162 | 33,173 | 23,551
Total | 7,999,538 | 6,891,361 | 4,904,766
Exploration Costs | 185,569 | 171,658 | 187,381
Dry Hole Costs | 14,970 | 53,230 | 72,486
Transportation Costs | 601,431 | 430,322 | 385,189
Production Costs | 1,468,628 | 1,332,210 | 998,065
Impairments | 1,270,735 | 1,031,037 | 725,052
Depreciation, Depletion and Amortization | 3,024,514 | 2,393,814 | 1,831,023
Income (Loss) Before Income Taxes | 1,433,691 | 1,479,090 | 705,570
Tax Provision (Benefit) | 722,906 | 637,868 | 350,708
Results of Operations | 710,785 | 841,222 | 354,862
United States [Member] |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | 7,048,572 | 5,814,942 | 3,928,240
Other | 40,780 | 32,329 | 19,886
Total | 7,089,352 | 5,847,271 | 3,948,126
Exploration Costs | 162,152 | 148,199 | 156,252
Dry Hole Costs | 1,772 | 30,521 | 30,927
Transportation Costs | 591,547 | 421,060 | 372,466
Production Costs | 1,264,633 | 1,096,955 | 763,769
Impairments | 294,172 | 575,976 | 271,466
Depreciation, Depletion and Amortization | 2,637,500 | 2,011,080 | 1,430,408
Income (Loss) Before Income Taxes | 2,137,576 | 1,563,480 | 922,838
Tax Provision (Benefit) | 761,459 | 569,153 | 375,855
Results of Operations | 1,376,117 | 994,327 | 546,983
Canada [Member] |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | 321,597 | 459,853 | 477,416
Other | 367 | 258 | (31)
Total | 321,964 | 460,111 | 477,385
Exploration Costs | 13,350 | 10,479 | 17,597
Dry Hole Costs | 1,570 | 432 | 14,875
Transportation Costs | 7,511 | 5,969 | 9,892
Production Costs | 154,509 | 174,973 | 174,667
Impairments | 976,563 | 452,103 | 451,703
Depreciation, Depletion and Amortization | 222,366 | 258,772 | 314,663
Income (Loss) Before Income Taxes | (1,053,905) | (442,617) | (506,012)
Tax Provision (Benefit) | (136,105) | (121,044) | (151,315)
Results of Operations | (917,800) | (321,573) | (354,697)
Trinidad [Member] |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | 565,030 | 555,143 | 447,852
Other | 15 | 586 | 3,696
Total | 565,045 | 555,729 | 451,548
Exploration Costs | 2,262 | 2,520 | 2,277
Dry Hole Costs | 0 | 0 | 5,000
Transportation Costs | 1,104 | 1,620 | 1,348
Production Costs | 37,792 | 49,318 | 51,125
Impairments | 0 | 0 | 1,465
Depreciation, Depletion and Amortization | 146,690 | 106,802 | 70,553
Income (Loss) Before Income Taxes | 377,197 | 395,469 | 319,780
Tax Provision (Benefit) | 119,442 | 202,815 | 140,413
Results of Operations | 257,755 | 192,654 | 179,367
Other International [Member] |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | 23,177 | 28,250 | 27,707
Other | 0 | 0 | 0
Total | 23,177 | 28,250 | 27,707
Exploration Costs | 7,805 | 10,460 | 11,255
Dry Hole Costs | 11,628 | 22,277 | 21,684
Transportation Costs | 1,269 | 1,673 | 1,483
Production Costs | 11,694 | 10,964 | 8,504
Impairments | 0 | 2,958 | 418
Depreciation, Depletion and Amortization | 17,958 | 17,160 | 15,399
Income (Loss) Before Income Taxes | (27,177) | (37,242) | (31,036)
Tax Provision (Benefit) | (21,890) | (13,056) | (14,245)
Results of Operations | $ (5,287) | $ (24,186) | $ (16,791)

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