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Business Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
business_unit
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information          
Reportable segments | segment     2    
Business units | business_unit     2    
Revenues $ 99,421 $ 229,607 $ 189,753 $ 444,915  
Loss from operations (275,310) (1,535,083) (548,865) (2,623,539)  
Interest income (expense), net (41,605) (73,727) (122,756) (136,569)  
(Loss) gain on extinguishment of debt (152) 17,934 41,179 17,934  
Reorganization items, net (200,918) 0 (200,918) 0  
Other income, net 2,077 2,170 2,230 1,634  
Loss before income taxes (515,908) (1,588,706) (829,130) (2,740,540)  
Capital expenditures 56,151 167,566 109,632 487,756  
Depreciation, depletion, amortization and accretion 36,313 107,917 77,062 228,451  
Total assets 2,240,908   2,240,908   $ 2,922,027
Full cost ceiling limitation impairment 251,000   359,400    
Loss on settlement of contract 1,092 0 90,184 0  
Write off of joint interest receivable     16,705 0  
Impairment 253,629 1,489,391 363,743 2,573,257  
Exploration and Production          
Segment Reporting Information          
Revenues 95,662 214,532 180,037 410,264  
Loss from operations (246,242) (1,511,600) (478,449) (2,565,759)  
Interest income (expense), net 0 (23) 1 (40)  
(Loss) gain on extinguishment of debt 0 0 0 0  
Reorganization items, net (18,504)   (18,504)    
Other income, net 1,674 1,630 2,424 1,176  
Loss before income taxes (263,072) (1,509,993) (494,528) (2,564,623)  
Capital expenditures 54,505 151,440 105,049 453,503  
Depreciation, depletion, amortization and accretion 29,359 95,430 63,293 202,640  
Total assets 1,150,340   1,150,340   1,959,975
Full cost ceiling limitation impairment 251,000 1,500,000 359,400 2,600,000  
Loss on settlement of contract 1,100   90,200    
Write off of joint interest receivable     16,700    
Midstream Services          
Segment Reporting Information          
Revenues 3,254 8,606 7,541 17,370  
Loss from operations 2,197 (3,154) (1,391) (7,027)  
Interest income (expense), net 0 0 0 0  
(Loss) gain on extinguishment of debt 0 0 0 0  
Reorganization items, net (39)   (39)    
Other income, net 22 9 (473) 13  
Loss before income taxes 2,180 (3,145) (1,903) (7,014)  
Capital expenditures 689 8,249 1,919 16,681  
Depreciation, depletion, amortization and accretion 2,345 2,793 4,791 5,473  
Total assets 203,351   203,351   254,212
Impairment     1,700    
All Other          
Segment Reporting Information          
Revenues 505 6,469 2,175 17,281  
Loss from operations (31,265) (20,329) (69,025) (50,753)  
Interest income (expense), net (41,605) (73,704) (122,757) (136,529)  
(Loss) gain on extinguishment of debt (152) 17,934 41,179 17,934  
Reorganization items, net (182,375)   (182,375)    
Other income, net 381 531 279 445  
Loss before income taxes (255,016) (75,568) (332,699) (168,903)  
Capital expenditures 957 7,877 2,664 17,572  
Depreciation, depletion, amortization and accretion 4,609 9,694 8,978 20,338  
Total assets 887,217   887,217   $ 707,840
Impairment 2,700   2,700    
Operating Segments          
Segment Reporting Information          
Revenues 105,526 253,705 204,336 496,574  
Operating Segments | Exploration and Production          
Segment Reporting Information          
Revenues 95,662 214,534 180,037 410,277  
Operating Segments | Midstream Services          
Segment Reporting Information          
Revenues 7,395 20,782 17,640 42,312  
Operating Segments | All Other          
Segment Reporting Information          
Revenues 2,469 18,389 6,659 43,985  
Intersegment Eliminations          
Segment Reporting Information          
Revenues (6,105) (24,098) (14,583) (51,659)  
Intersegment Eliminations | Exploration and Production          
Segment Reporting Information          
Revenues 0 (2) 0 (13)  
Intersegment Eliminations | Midstream Services          
Segment Reporting Information          
Revenues (4,141) (12,176) (10,099) (24,942)  
Intersegment Eliminations | All Other          
Segment Reporting Information          
Revenues $ (1,964) $ (11,920) $ (4,484) $ (26,704)