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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 465,108 |  | $ 493,603 |  | $ 512,987 |  | $ 511,690 |  | $ 1,338,098 |  | $ 532,798 |  | $ 478,434 |  | $ 381,635 |  | $ 1,983,388 |  | $ 2,730,965 |  | $ 1,415,213 |
Income (loss) from operations | 97,979 | [1],[2],[3] | 6,088 | [1],[2],[3] | 86,458 | [1],[2],[3] | (359,526) | [1],[2],[3] | (209,690) | [4],[5] | (75,871) | [4],[5] | 762,413 | [4],[5] | (151,656) | [4],[5] | (169,001) |  | 325,196 |  | 429,013 |
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (270,234) |  | (303,349) |  | (237,332) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 122,696 |  | 0 |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (82,005) |  | (3,075) |  | (38,232) |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,445 |  | 4,741 |  | 3,122 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (508,795) |  | 146,209 |  | 156,571 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,423,883 | [6] | 2,173,982 | [6] | 1,816,494 | [6]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 666,645 |  | 657,830 |  | 380,244 |
Total assets | 7,684,795 |  |  |  |  |  |  |  | 9,790,731 |  |  |  |  |  |  |  | 7,684,795 |  | 9,790,731 |  |  |
Exploration and Production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,834,160 |  | 2,571,141 |  | 1,237,300 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,509 | [7] | 518,144 | [7] | 521,117 | [7]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,168 |  | 1,286 |  | 509 |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,696 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,487 |  | 1,868 |  | 3,601 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,164 |  | 643,994 |  | 525,227 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,319,012 | [6] | 1,951,490 | [6] | 1,697,691 | [6]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 605,242 |  | 598,101 |  | 328,753 |
Total assets | 6,157,225 |  |  |  |  |  |  |  | 8,681,056 |  |  |  |  |  |  |  | 6,157,225 |  | 8,681,056 |  |  |
Drilling and Oil Field Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,641 |  | 116,633 |  | 103,298 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (40,155) | [8] | 11,911 | [8] | 10,341 | [8]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (95) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (40,155) |  | 11,911 |  | 10,246 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,125 | [6] | 27,527 | [6] | 25,674 | [6]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,291 |  | 34,677 |  | 32,582 |
Total assets | 158,737 |  |  |  |  |  |  |  | 199,523 |  |  |  |  |  |  |  | 158,737 |  | 199,523 |  |  |
Midstream Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,460 |  | 38,835 |  | 65,181 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,567) | [9] | (73,027) | [9] | (12,975) | [9]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (209) |  | (559) |  | (611) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,222) |  | 0 |  | (485) |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24,998) |  | (73,586) |  | (14,071) |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,706 | [6] | 80,413 | [6] | 38,514 | [6]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,972 |  | 7,188 |  | 4,650 |
Total assets | 188,165 |  |  |  |  |  |  |  | 151,492 |  |  |  |  |  |  |  | 188,165 |  | 151,492 |  |  |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,127 |  | 4,356 |  | 9,434 |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (169,788) | [10] | (131,832) | [10] | (89,470) | [10]
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (271,193) |  | (304,076) |  | (237,135) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (82,005) |  | (3,075) |  | (38,232) |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,180 |  | 2,873 |  | 6 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (512,806) |  | (436,110) |  | (364,831) |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,040 | [6] | 114,552 | [6] | 54,615 | [6]
Depreciation, depletion, amortization and accretion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,140 |  | 17,864 |  | 14,259 |
Total assets | 1,180,668 |  |  |  |  |  |  |  | 758,660 |  |  |  |  |  |  |  | 1,180,668 |  | 758,660 |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,205,052 |  | 3,071,904 |  | 1,822,497 |
Operating Segments | Exploration and Production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,834,480 |  | 2,571,544 |  | 1,237,565 |
Operating Segments | Drilling and Oil Field Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 187,456 |  | 379,345 |  | 390,485 |
Operating Segments | Midstream Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 179,989 |  | 116,659 |  | 183,912 |
Operating Segments | All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,127 |  | 4,356 |  | 10,535 |
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (221,664) |  | (340,939) |  | (407,284) |
Intersegment Eliminations | Exploration and Production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (320) |  | (403) |  | (265) |
Intersegment Eliminations | Drilling and Oil Field Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (120,815) |  | (262,712) |  | (287,187) |
Intersegment Eliminations | Midstream Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (100,529) |  | (77,824) |  | (118,731) |
Intersegment Eliminations | All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ (1,101) |
[1] | Includes loss (gain) on commodity derivative contracts of $40.9 million, $(103.7) million, $132.8 million and $(22.9) million for the first, second, third and fourth quarters, respectively.
[2] | Includes a $10.6 million impairment of various drilling assets and a $2.9 million impairment of a corporate asset in the second quarter of 2013 and a $2.1 million and $10.0 million impairment of certain midstream inventory, natural gas compressors, gas treating plants and a CO2 compression station in the second and fourth quarters of 2013, respectively.
[3] | Includes loss on sale of Permian Properties of $398.9 million in the first quarter of 2013.
[4] | Includes loss (gain) on commodity derivative contracts of $254.6 million, $(669.9) million, $193.5 million and $(19.6) million for the first, second, third and fourth quarters, respectively.
[5] | 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.
[6] | On an accrual basis and exclusive of acquisitions.
[7] | Income from operations includes impairment of the Company’s goodwill of $235.4 million for the year ended December 31, 2012.
[8] | For the year ended December 31, 2013, loss from operations includes impairment of $11.1 million on certain drilling assets.
[9] | For the years ended December 31, 2013 and 2012, loss from operations includes impairments of the Company’s gas treating plants in west Texas and other midstream assets of $3.9 million and $59.7 million, respectively.
[10] | For the year ended December 31, 2013, loss from operations includes a $2.9 million impairment of a corporate asset and an $8.3 million impairment of the Company’s CO2 compression facilities. For the year ended December 31, 2012, loss from operations includes a $19.6 million impairment of the Company’s CO2 compression facilities.

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