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Business Segment Information - Summarized Financial Information Concerning Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,071,904 |  | $ 1,822,497 |  | $ 1,355,068 |
Inter-segment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (340,939) |  | (407,284) |  | (423,332) |
Total revenues | 1,338,098 |  | 532,798 |  | 478,434 |  | 381,635 |  | 373,838 |  | 363,753 |  | 364,774 |  | 312,848 |  | 2,730,965 |  | 1,415,213 |  | 931,736 |
Income (loss) from operations | (209,690) | [1],[2] | (75,871) | [1],[2] | 762,413 | [1],[2] | (151,656) | [1],[2] | (339,457) | [3] | 696,582 | [3] | 279,716 | [3] | (207,828) | [3] | 325,196 | [4] | 429,013 | [4] | (6,786) | [4]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (303,349) |  | (237,332) |  | (247,442) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,696 |  | 0 |  | 0 |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,075) |  | (38,232) |  | 0 |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,741 |  | 3,122 |  | 2,558 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,209 |  | 156,571 |  | (251,670) |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,173,982 | [5] | 1,816,494 | [5] | 1,120,419 | [5]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 657,830 |  | 380,244 |  | 326,111 |
Total assets | 9,790,731 |  |  |  |  |  |  |  | 6,219,609 |  |  |  |  |  |  |  | 9,790,731 |  | 6,219,609 |  |  |
Exploration and Production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,571,544 |  | 1,237,565 |  | 779,450 |
Inter-segment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (403) |  | (265) |  | (259) |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,571,141 |  | 1,237,300 |  | 779,191 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 518,144 | [4] | 521,117 | [4] | 88,390 | [4]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,286 |  | 509 |  | 496 |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,696 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,868 |  | 3,601 |  | 1,251 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 643,994 |  | 525,227 |  | 90,137 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,951,490 | [5] | 1,697,691 | [5] | 1,018,699 | [5]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 598,101 |  | 328,753 |  | 278,110 |
Total assets | 8,681,056 |  |  |  |  |  |  |  | 5,345,527 |  |  |  |  |  |  |  | 8,681,056 |  | 5,345,527 |  |  |
Drilling and Oil Field Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 379,345 |  | 390,485 |  | 265,262 |
Inter-segment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (262,712) |  | (287,187) |  | (236,687) |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,633 |  | 103,298 |  | 28,575 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,911 | [4] | 10,341 | [4] | (9,970) | [4]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (95) |  | (920) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,911 |  | 10,246 |  | (10,890) |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,527 | [5] | 25,674 | [5] | 31,658 | [5]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,677 |  | 32,582 |  | 30,031 |
Total assets | 199,523 |  |  |  |  |  |  |  | 219,101 |  |  |  |  |  |  |  | 199,523 |  | 219,101 |  |  |
Midstream Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,659 |  | 183,912 |  | 275,071 |
Inter-segment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (77,824) |  | (118,731) |  | (176,549) |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,835 |  | 65,181 |  | 98,522 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73,027) | [4] | (12,975) | [4] | 3,959 | [4]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (559) |  | (611) |  | (649) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (485) |  | 625 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73,586) |  | (14,071) |  | 3,935 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,413 | [5] | 38,514 | [5] | 48,401 | [5]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,188 |  | 4,650 |  | 4,030 |
Total assets | 151,492 |  |  |  |  |  |  |  | 138,844 |  |  |  |  |  |  |  | 151,492 |  | 138,844 |  |  |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,356 |  | 10,535 |  | 35,285 |
Inter-segment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (1,101) |  | (9,837) |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,356 |  | 9,434 |  | 25,448 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (131,832) | [4] | (89,470) | [4] | (89,165) | [4]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (304,076) |  | (237,135) |  | (246,369) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,075) |  | (38,232) |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,873 |  | 6 |  | 682 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (436,110) |  | (364,831) |  | (334,852) |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114,552 | [5] | 54,615 | [5] | 21,661 | [5]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,864 |  | 14,259 |  | 13,940 |
Total assets | $ 758,660 |  |  |  |  |  |  |  | $ 516,137 |  |  |  |  |  |  |  | $ 758,660 |  | $ 516,137 |  |  |
[1] | Includes unrealized losses (gains) of $129.2 million, $(580.7) million, $222.5 million and $19.3 million on commodity derivative contracts for the first, second, third and fourth quarters, respectively.
[2] | Includes a $235.4 million goodwill impairment and a $79.3 million impairment of gas treating plants and CO2 compression facilities in the fourth quarter of 2012.
[3] | Includes unrealized losses (gains) of $269.0 million, $(188.3) million, $(604.6) million and $429.1 million on commodity derivative contracts for the first, second, third and fourth quarters, respectively.
[4] | Exploration and production segment income from operations includes unrealized (gains) losses of $(209.7) million, $(94.8) million and $275.2 million on commodity derivative contracts for the years ended December 31, 2012, 2011 and 2010, respectively, and impairment of the Company’s goodwill of $235.4 million for the year ended December 31, 2012. For the year ended December 31, 2012, the loss from operations for the midstream services segment includes a $59.7 million impairment of the Company’s gas treating plants in west Texas and the loss from operations in the All Other column includes a $19.6 million impairment of the Company’s CO2 compression facilities.
[5] | On an accrual basis and exclusive of acquisitions.

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