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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, 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.