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Business Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
business_unit
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information          
Reportable segments | segment     2    
Business units | business_unit     2    
Revenues $ 104,056 $ 180,152 $ 293,809 $ 625,067  
Loss from operations (357,338) (1,059,733) (906,203) (3,683,272)  
Interest expense, net (3,343) (77,000) (126,099) (213,569)  
Gain on extinguishment of debt 0 340,699 41,179 358,633  
Reorganization items, net (42,754) 0 (243,672) 0  
Other (expense) income, net (898) (426) 1,332 1,208  
Loss before income taxes (404,333) (796,460) (1,233,463) (3,537,000)  
Capital expenditures 51,774 113,297 161,407 601,052  
Depreciation, depletion, amortization and accretion 35,239 79,012 112,301 307,463  
Total assets 1,886,504   1,886,504   $ 2,922,027
Full cost ceiling limitation impairment 298,000   657,400    
Loss on settlement of contract 0 0 90,184 0  
Write off of joint interest receivable     16,704 0  
Impairment 354,451 1,074,588 718,194 3,647,845  
Exploration and Production          
Segment Reporting Information          
Revenues 99,934 165,135 279,971 575,399  
Loss from operations (275,874) (988,903) (754,323) (3,554,661)  
Interest expense, net (1) (3) 0 (42)  
Gain on extinguishment of debt   0 0 0  
Reorganization items, net 2,228   (16,276)    
Other (expense) income, net (114) (109) 2,310 1,067  
Loss before income taxes (273,761) (989,015) (768,289) (3,553,636)  
Capital expenditures 50,578 106,013 155,627 559,515  
Depreciation, depletion, amortization and accretion 27,744 67,652 91,037 270,292  
Total assets 846,103   846,103   1,959,975
Full cost ceiling limitation impairment 298,000 1,000,000 657,400 3,600,000  
Loss on settlement of contract     90,200    
Write off of joint interest receivable     16,700    
Midstream Services          
Segment Reporting Information          
Revenues 3,004 8,838 10,545 26,208  
Loss from operations (55,345) (2,090) (56,736) (9,118)  
Interest expense, net 0 0 0 0  
Gain on extinguishment of debt   0 0 0  
Reorganization items, net 468   429    
Other (expense) income, net 462 20 (11) 33  
Loss before income taxes (54,415) (2,070) (56,318) (9,085)  
Capital expenditures 1,166 3,719 3,085 20,400  
Depreciation, depletion, amortization and accretion 2,328 2,984 7,120 8,457  
Total assets 145,832   145,832   254,212
Midstream Services | Electrical Transmission System          
Segment Reporting Information          
Impairment 55,600   55,600    
Midstream Services | Compressors and various equipment          
Segment Reporting Information          
Impairment     1,700    
All Other          
Segment Reporting Information          
Revenues 1,118 6,179 3,293 23,460  
Loss from operations (26,119) (68,740) (95,144) (119,493)  
Interest expense, net (3,342) (76,997) (126,099) (213,527)  
Gain on extinguishment of debt   340,699 41,179 358,633  
Reorganization items, net (45,450)   (227,825)    
Other (expense) income, net (1,246) (337) (967) 108  
Loss before income taxes (76,157) 194,625 (408,856) 25,721  
Capital expenditures 30 3,565 2,695 21,137  
Depreciation, depletion, amortization and accretion 5,167 8,376 14,144 28,714  
Total assets 894,569   894,569   $ 707,840
Impairment 900   3,500    
All Other | Oklahoma City, Oklahoma          
Segment Reporting Information          
Impairment       15,400  
All Other | Drilling Assets          
Segment Reporting Information          
Impairment       19,800  
Operating Segments          
Segment Reporting Information          
Revenues 107,547 202,309 311,883 698,881  
Operating Segments | Exploration and Production          
Segment Reporting Information          
Revenues 99,934 165,135 279,971 575,411  
Operating Segments | Midstream Services          
Segment Reporting Information          
Revenues 5,433 20,812 23,073 63,123  
Operating Segments | All Other          
Segment Reporting Information          
Revenues 2,180 16,362 8,839 60,347  
Intersegment Eliminations          
Segment Reporting Information          
Revenues (3,491) (22,157) (18,074) (73,814)  
Intersegment Eliminations | Exploration and Production          
Segment Reporting Information          
Revenues 0 0 0 (12)  
Intersegment Eliminations | Midstream Services          
Segment Reporting Information          
Revenues (2,429) (11,974) (12,528) (36,915)  
Intersegment Eliminations | All Other          
Segment Reporting Information          
Revenues $ (1,062) $ (10,183) $ (5,546) $ (36,887)