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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
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.