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Business Segment Information - Summarized Financial Information Concerning Segments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
business_unit
segment
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information          
Reportable segments | segment     3    
Business units | business_unit     3    
Total revenues $ 229,607 $ 374,714 $ 444,915 $ 817,770  
Loss from operations (1,535,083) 42,079 (2,623,539) (40,251)  
Interest expense, net (73,727) (61,863) (136,569) (123,906)  
Gain on extinguishment of debt 17,934 0 17,934 0  
Other (expense) income, net 2,170 1,338 1,634 3,432  
Loss before income taxes (1,588,706) (18,446) (2,740,540) (160,725)  
Capital expenditures 167,566 376,937 487,756 652,710  
Depreciation, depletion, amortization and accretion 107,917 113,743 228,451 250,196  
Total assets 5,435,048   5,435,048   $ 7,259,225
Exploration and Production          
Segment Reporting Information          
Total revenues 214,532 339,906 410,264 747,244  
Loss from operations (1,511,600) 69,782 (2,565,759) 13,306  
Interest expense, net (23) (4) (40) 139  
Gain on extinguishment of debt 0   0    
Other (expense) income, net 1,630 (49) 1,176 (234)  
Loss before income taxes (1,509,993) 69,729 (2,564,623) 13,211  
Capital expenditures 151,440 356,568 453,503 620,809  
Depreciation, depletion, amortization and accretion 95,430 98,357 202,640 219,398  
Total assets 3,708,676   3,708,676   6,273,802
Drilling and Oil Field Services          
Segment Reporting Information          
Total revenues 5,241 18,829 15,086 35,932  
Loss from operations (3,754) (2,347) (11,526) (5,449)  
Interest expense, net 0 0 0 0  
Gain on extinguishment of debt 0   0    
Other (expense) income, net 4 (75) 0 (473)  
Loss before income taxes (3,750) (2,422) (11,526) (5,922)  
Capital expenditures 598 6,654 2,472 7,275  
Depreciation, depletion, amortization and accretion 5,000 7,661 10,760 15,372  
Total assets 91,905   91,905   115,083
Midstream Services          
Segment Reporting Information          
Total revenues 8,606 14,874 17,370 32,519  
Loss from operations (3,154) (2,345) (7,027) (3,756)  
Interest expense, net 0 0 0 0  
Gain on extinguishment of debt 0   0    
Other (expense) income, net 9 0 13 0  
Loss before income taxes (3,145) (2,345) (7,014) (3,756)  
Capital expenditures 8,249 5,808 16,681 11,766  
Depreciation, depletion, amortization and accretion 2,793 2,509 5,473 4,950  
Total assets 221,064   221,064   219,691
All Other          
Segment Reporting Information          
Total revenues 1,228 1,105 2,195 2,075  
Loss from operations (16,575) (23,011) (39,227) (44,352)  
Interest expense, net (73,704) (61,859) (136,529) (124,045)  
Gain on extinguishment of debt 17,934   17,934    
Other (expense) income, net 527 1,462 445 4,139  
Loss before income taxes (71,818) (83,408) (157,377) (164,258)  
Capital expenditures 7,279 7,907 15,100 12,860  
Depreciation, depletion, amortization and accretion 4,694 5,216 9,578 10,476  
Total assets 1,413,403   1,413,403   $ 650,649
Operating Segments          
Segment Reporting Information          
Total revenues 253,705 431,322 496,574 933,005  
Operating Segments | Exploration and Production          
Segment Reporting Information          
Total revenues 214,534 339,906 410,277 747,244  
Operating Segments | Drilling and Oil Field Services          
Segment Reporting Information          
Total revenues 17,161 51,891 41,790 98,971  
Operating Segments | Midstream Services          
Segment Reporting Information          
Total revenues 20,782 38,420 42,312 84,715  
Operating Segments | All Other          
Segment Reporting Information          
Total revenues 1,228 1,105 2,195 2,075  
Intersegment Eliminations          
Segment Reporting Information          
Total revenues (24,098) (56,608) (51,659) (115,235)  
Intersegment Eliminations | Exploration and Production          
Segment Reporting Information          
Total revenues (2) 0 (13) 0  
Intersegment Eliminations | Drilling and Oil Field Services          
Segment Reporting Information          
Total revenues (11,920) (33,062) (26,704) (63,039)  
Intersegment Eliminations | Midstream Services          
Segment Reporting Information          
Total revenues (12,176) (23,546) (24,942) (52,196)  
Intersegment Eliminations | All Other          
Segment Reporting Information          
Total revenues $ 0 $ 0 $ 0 $ 0