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Business Segment Information - Summarized Financial Information Concerning Segments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
business_unit
segment
Dec. 31, 2014
USD ($)
segment
Dec. 31, 2013
USD ($)
segment
Segment Reporting [Abstract]                      
Reportable segments | segment                 3 3 3
Business units | business_unit                 3    
Segment Reporting Information [Line Items]                      
Revenues $ 143,642 $ 180,152 $ 229,607 $ 215,308 $ 346,881 $ 394,107 $ 374,714 $ 443,056 $ 768,709 $ 1,558,758 $ 1,983,388
Income (loss) from operations (959,406) $ (1,059,733) $ (1,535,083) $ (1,088,456) 373,984 $ 256,491 $ 42,079 $ (82,330) (4,642,678) 590,224 (169,001)
Interest income (expense), net                 (321,421) (244,109) (270,234)
Gain (loss) on extinguishment of debt                 641,131 0 (82,005)
Other income (expense), net                 2,040 3,490 12,445
(Loss) income before income taxes                 (4,320,928) 349,605 (508,795)
Capital expenditures                 701,615 1,608,889 1,423,883
Depreciation, depletion, amortization and accretion                 371,772 503,023 666,645
Total assets 2,991,155       7,259,225       2,991,155 7,259,225  
Exploration and Production                      
Segment Reporting Information [Line Items]                      
Revenues                 707,434 1,422,900 1,834,160
Income (loss) from operations                 (4,461,907) 713,716 62,509
Interest income (expense), net                 (42) 100 1,168
Gain (loss) on extinguishment of debt                 0   0
Other income (expense), net                 1,368 (423) 5,487
(Loss) income before income taxes                 (4,460,581) 713,393 69,164
Capital expenditures                 656,022 1,508,100 1,319,012
Depreciation, depletion, amortization and accretion                 324,471 443,573 605,242
Total assets 1,959,975       6,273,802       1,959,975 6,273,802  
Drilling and Oil Field Services                      
Segment Reporting Information [Line Items]                      
Revenues                 22,124 76,088 66,641
Income (loss) from operations                 (59,999) (37,564) (40,155)
Interest income (expense), net                 0 0 0
Gain (loss) on extinguishment of debt                 0   0
Other income (expense), net                 13 (541) 0
(Loss) income before income taxes                 (59,986) (38,105) (40,155)
Capital expenditures                 4,632 18,385 7,125
Depreciation, depletion, amortization and accretion                 17,438 29,105 33,291
Total assets 27,621       115,083       27,621 115,083  
Midstream Services                      
Segment Reporting Information [Line Items]                      
Revenues                 33,809 55,394 79,460
Income (loss) from operations                 (15,218) (9,094) (21,567)
Interest income (expense), net                 0 0 (209)
Gain (loss) on extinguishment of debt                 0   0
Other income (expense), net                 253 9 (3,222)
(Loss) income before income taxes                 (14,965) (9,085) (24,998)
Capital expenditures                 21,556 44,606 55,706
Depreciation, depletion, amortization and accretion                 11,742 10,085 7,972
Total assets 254,212       219,691       254,212 219,691  
All Other                      
Segment Reporting Information [Line Items]                      
Revenues                 5,342 4,376 3,127
Income (loss) from operations                 (105,554) (76,834) (169,788)
Interest income (expense), net                 (321,379) (244,209) (271,193)
Gain (loss) on extinguishment of debt                 641,131   (82,005)
Other income (expense), net                 406 4,445 10,180
(Loss) income before income taxes                 214,604 (316,598) (512,806)
Capital expenditures                 19,405 37,798 42,040
Depreciation, depletion, amortization and accretion                 18,121 20,260 20,140
Total assets $ 749,347       $ 650,649       749,347 650,649  
Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 861,229 1,763,380 2,205,052
Operating Segments | Exploration and Production                      
Segment Reporting Information [Line Items]                      
Revenues                 707,446 1,423,073 1,834,480
Operating Segments | Drilling and Oil Field Services                      
Segment Reporting Information [Line Items]                      
Revenues                 67,358 192,944 187,456
Operating Segments | Midstream Services                      
Segment Reporting Information [Line Items]                      
Revenues                 81,083 142,987 179,989
Operating Segments | All Other                      
Segment Reporting Information [Line Items]                      
Revenues                 5,342 4,376 3,127
Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 (92,520) (204,622) (221,664)
Intersegment Eliminations | Exploration and Production                      
Segment Reporting Information [Line Items]                      
Revenues                 (12) (173) (320)
Intersegment Eliminations | Drilling and Oil Field Services                      
Segment Reporting Information [Line Items]                      
Revenues                 (45,234) (116,856) (120,815)
Intersegment Eliminations | Midstream Services                      
Segment Reporting Information [Line Items]                      
Revenues                 (47,274) (87,593) (100,529)
Intersegment Eliminations | All Other                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 0 $ 0 $ 0