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Summarized Financial Information Concerning Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Segment Reporting Information          
Total revenues $ 374,714 $ 512,987 $ 817,770 $ 1,024,677  
(Loss) income from operations 50,534 86,458 (23,475) (273,068)  
Interest income (expense), net (61,863) (61,159) (123,906) (147,069)  
Loss on extinguishment of debt 0 0 0 (82,005)  
Other (expense) income, net 1,338 (106) 3,432 505  
Income (loss) before income taxes (9,991) 25,193 (143,949) (501,637)  
Capital expenditures 376,937 [1] 387,158 [1] 652,710 [1] 775,870 [1]  
Depreciation, depletion, amortization, accretion and impairment 116,876 180,368 418,108 363,009  
Total assets 6,912,819   6,912,819   7,684,795
Exploration and Production
          
Segment Reporting Information          
Total revenues 339,906 458,293 747,244 939,622  
(Loss) income from operations 78,237 241,666 30,082 [2] (60,042) [2]  
Interest income (expense), net (4) 317 139 635  
Loss on extinguishment of debt       0  
Other (expense) income, net (49) (330) (234) 298  
Income (loss) before income taxes 78,184 241,653 29,987 (59,109)  
Capital expenditures 356,568 [1] 358,582 [1] 620,809 [1] 716,173 [1]  
Depreciation, depletion, amortization, accretion and impairment 98,357 148,884 384,176 316,397  
Total assets 5,288,478   5,288,478   6,157,225
Drilling and Oil Field Services
          
Segment Reporting Information          
Total revenues 18,829 16,089 35,932 33,459  
(Loss) income from operations (2,347) [3] (19,443) [3] (5,449) [3] (28,408) [3]  
Interest income (expense), net 0 0 0 0  
Loss on extinguishment of debt       0  
Other (expense) income, net (75) 0 (473) 0  
Income (loss) before income taxes (2,422) (19,443) (5,922) (28,408)  
Capital expenditures 6,654 [1] 883 [1] 7,275 [1] 1,515 [1]  
Depreciation, depletion, amortization, accretion and impairment 10,794 19,478 18,506 28,292  
Total assets 142,858   142,858   158,737
Midstream Services
          
Segment Reporting Information          
Total revenues 14,874 37,827 32,519 49,965  
(Loss) income from operations (2,345) (7,956) (3,756) (10,415)  
Interest income (expense), net 0 (84) 0 (209)  
Loss on extinguishment of debt       0  
Other (expense) income, net 0 135 0 (664)  
Income (loss) before income taxes (2,345) (7,905) (3,756) (11,288)  
Capital expenditures 5,808 [1] 15,111 [1] 11,766 [1] 30,332 [1]  
Depreciation, depletion, amortization, accretion and impairment 2,509 4,017 4,950 5,705  
Total assets 193,867   193,867   188,165
All Other
          
Segment Reporting Information          
Total revenues 1,105 778 2,075 1,631  
(Loss) income from operations (23,011) (127,809) (44,352) (174,203)  
Interest income (expense), net (61,859) (61,392) (124,045) (147,495)  
Loss on extinguishment of debt       (82,005)  
Other (expense) income, net 1,462 89 4,139 871  
Income (loss) before income taxes (83,408) (189,112) (164,258) (402,832)  
Capital expenditures 7,907 [1] 12,582 [1] 12,860 [1] 27,850 [1]  
Depreciation, depletion, amortization, accretion and impairment 5,216 7,989 10,476 12,615  
Total assets 1,287,616   1,287,616   1,180,668
Operating Segments
          
Segment Reporting Information          
Total revenues 431,322 570,543 933,005 1,139,377  
Operating Segments | Exploration and Production
          
Segment Reporting Information          
Total revenues 339,906 458,374 747,244 939,784  
Operating Segments | Drilling and Oil Field Services
          
Segment Reporting Information          
Total revenues 51,891 47,100 98,971 96,837  
Operating Segments | Midstream Services
          
Segment Reporting Information          
Total revenues 38,420 64,291 84,715 101,125  
Operating Segments | All Other
          
Segment Reporting Information          
Total revenues 1,105 778 2,075 1,631  
Intersegment Eliminations
          
Segment Reporting Information          
Total revenues (56,608) (57,556) (115,235) (114,700)  
Intersegment Eliminations | Exploration and Production
          
Segment Reporting Information          
Total revenues 0 (81) 0 (162)  
Intersegment Eliminations | Drilling and Oil Field Services
          
Segment Reporting Information          
Total revenues (33,062) (31,011) (63,039) (63,378)  
Intersegment Eliminations | Midstream Services
          
Segment Reporting Information          
Total revenues (23,546) (26,464) (52,196) (51,160)  
Intersegment Eliminations | All Other
          
Segment Reporting Information          
Total revenues $ 0 $ 0 $ 0 $ 0  
[1] On an accrual basis and exclusive of acquisitions.
[2] Income (loss) from operations includes a full cost ceiling limitation impairment of $164.8 million for the six-month period ended June 30, 2014, and a loss on the sale of the Permian Properties of $399.1 million for the six-month period ended June 30, 2013.
[3] Income (loss) from operations includes an impairment of $3.1 million and $10.6 million on certain drilling assets held for sale for the three and six-month periods ended June 30, 2014 and June 30, 2013, respectively.