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Business Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
business_unit
segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information      
Reportable segments | segment 2    
Business units | business_unit 2    
Revenues $ 90,332 $ 215,308  
Loss from operations (273,555) (1,088,456)  
Interest expense, net (81,151) (62,842)  
Gain on extinguishment of debt 41,331 0  
Other (expense) income, net 153 (536)  
Loss before income taxes (313,222) (1,151,834)  
Capital expenditures 53,481 320,191  
Depreciation, depletion, amortization and accretion 40,749 120,534  
Total assets 2,574,059 2,922,027 $ 2,922,027
Full cost ceiling limitation impairment 108,400    
Loss on settlement of contract 89,092 0  
Write off of joint interest receivable 16,701 0  
Impairment 110,114 1,083,866  
Exploration and Production      
Segment Reporting Information      
Revenues 84,375 195,732  
Loss from operations (232,207) (1,054,158)  
Interest expense, net 0 (16)  
Gain on extinguishment of debt 0    
Other (expense) income, net 750 (454)  
Loss before income taxes (231,457) (1,054,628)  
Capital expenditures 50,544 302,062  
Depreciation, depletion, amortization and accretion 33,934 107,211  
Total assets 1,430,717 1,959,975  
Full cost ceiling limitation impairment 108,400 1,100,000  
Loss on settlement of contract 89,100    
Write off of joint interest receivable 16,700    
Midstream Services      
Segment Reporting Information      
Revenues 4,287 8,764  
Loss from operations (3,588) (3,873)  
Interest expense, net 0 0  
Gain on extinguishment of debt 0    
Other (expense) income, net (495) 4  
Loss before income taxes (4,083) (3,869)  
Capital expenditures 1,230 8,432  
Depreciation, depletion, amortization and accretion 2,446 2,679  
Total assets 205,382 254,212  
Impairment 1,700    
All Other      
Segment Reporting Information      
Revenues 1,670 10,812  
Loss from operations (37,760) (30,425)  
Interest expense, net (81,151) (62,826)  
Gain on extinguishment of debt 41,331    
Other (expense) income, net (102) (86)  
Loss before income taxes (77,682) (93,337)  
Capital expenditures 1,707 9,697  
Depreciation, depletion, amortization and accretion 4,369 10,644  
Total assets 937,960 707,840  
Operating Segments      
Segment Reporting Information      
Revenues 98,809 242,868  
Operating Segments | Exploration and Production      
Segment Reporting Information      
Revenues 84,375 195,743  
Operating Segments | Midstream Services      
Segment Reporting Information      
Revenues 10,245 21,529  
Operating Segments | All Other      
Segment Reporting Information      
Revenues 4,189 25,596  
Intersegment Eliminations      
Segment Reporting Information      
Revenues (8,477) (27,560)  
Intersegment Eliminations | Exploration and Production      
Segment Reporting Information      
Revenues 0 (11)  
Intersegment Eliminations | Midstream Services      
Segment Reporting Information      
Revenues (5,958) (12,765)  
Intersegment Eliminations | All Other      
Segment Reporting Information      
Revenues $ (2,519) $ (14,784)