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Summarized Financial Information Concerning Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information      
Total revenues $ 443,056 $ 511,690  
Loss from operations (74,009) (359,526)  
Interest income (expense), net (62,043) (85,910)  
Loss on extinguishment of debt 0 (82,005)  
Other (expense) income, net 2,094 611  
Loss before income taxes (133,958) (526,830)  
Capital expenditures 275,774 [1] 388,712 [1]  
Depreciation, depletion, amortization and accretion 136,453 182,641  
Total assets 6,878,257   7,684,795
Exploration and Production
      
Segment Reporting Information      
Total revenues 407,338 481,329  
Loss from operations (48,154) [2] (301,707) [2]  
Interest income (expense), net 143 318  
Loss on extinguishment of debt   0  
Other (expense) income, net (185) 628  
Loss before income taxes (48,196) (300,761)  
Capital expenditures 264,243 [1] 357,591 [1]  
Depreciation, depletion, amortization and accretion 121,041 167,513  
Total assets 4,995,639   6,157,225
Drilling and Oil Field Services
      
Segment Reporting Information      
Total revenues 17,103 17,370  
Loss from operations (3,102) (8,965)  
Interest income (expense), net 0 0  
Loss on extinguishment of debt   0  
Other (expense) income, net (398) 0  
Loss before income taxes (3,500) (8,965)  
Capital expenditures 620 [1] 632 [1]  
Depreciation, depletion, amortization and accretion 7,711 8,814  
Total assets 150,869   158,737
Midstream Services
      
Segment Reporting Information      
Total revenues 17,646 12,138  
Loss from operations (1,411) (2,459)  
Interest income (expense), net 0 (125)  
Loss on extinguishment of debt   0  
Other (expense) income, net 0 (800)  
Loss before income taxes (1,411) (3,384)  
Capital expenditures 5,957 [1] 15,221 [1]  
Depreciation, depletion, amortization and accretion 2,441 1,687  
Total assets 192,093   188,165
All Other
      
Segment Reporting Information      
Total revenues 969 853  
Loss from operations (21,342) (46,395)  
Interest income (expense), net (62,186) (86,103)  
Loss on extinguishment of debt   (82,005)  
Other (expense) income, net 2,677 783  
Loss before income taxes (80,851) (213,720)  
Capital expenditures 4,954 [1] 15,268 [1]  
Depreciation, depletion, amortization and accretion 5,260 4,627  
Total assets 1,539,656   1,180,668
Operating Segments
      
Segment Reporting Information      
Total revenues 501,681 568,834  
Operating Segments | Exploration and Production
      
Segment Reporting Information      
Total revenues 407,338 481,410  
Operating Segments | Drilling and Oil Field Services
      
Segment Reporting Information      
Total revenues 47,080 49,737  
Operating Segments | Midstream Services
      
Segment Reporting Information      
Total revenues 46,294 36,834  
Operating Segments | All Other
      
Segment Reporting Information      
Total revenues 969 853  
Intersegment Eliminations
      
Segment Reporting Information      
Total revenues (58,625) (57,144)  
Intersegment Eliminations | Exploration and Production
      
Segment Reporting Information      
Total revenues 0 (81)  
Intersegment Eliminations | Drilling and Oil Field Services
      
Segment Reporting Information      
Total revenues (29,977) (32,367)  
Intersegment Eliminations | Midstream Services
      
Segment Reporting Information      
Total revenues (28,648) (24,696)  
Intersegment Eliminations | All Other
      
Segment Reporting Information      
Total revenues $ 0 $ 0  
[1] On an accrual basis and exclusive of acquisitions.
[2] Loss from operations includes a full cost ceiling limitation impairment of $164.8 million for the three-month period ended March 31, 2014 and a loss on the sale of the Permian Properties of $399.1 million for the three-month period ended March 31, 2013.