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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenues        
Oil and gas revenues $ 159,337 $ 214,110 $ 276,652 $ 387,969
Well services and midstream revenues 19,743 15,936 32,711 22,464
Total revenues 179,080 230,046 309,363 410,433
Operating expenses        
Lease operating expenses 31,523 37,761 62,587 76,886
Well services and midstream operating expenses 8,875 7,395 13,264 9,347
Marketing, transportation and gathering expenses 6,491 7,570 15,043 14,848
Production taxes 14,367 20,618 25,120 37,239
Depreciation, depletion and amortization 122,488 119,218 244,937 237,696
Exploration expenses 340 1,082 703 1,925
Rig termination 0 2,815 0 3,895
Impairment 23 19,516 3,585 24,837
General and administrative expenses 21,876 21,508 46,242 44,832
Total operating expenses 205,983 237,483 411,481 451,505
Loss on sale of properties (1,311) 0 (1,311) 0
Operating loss (28,214) (7,437) (103,429) (41,072)
Other income (expense)        
Equity in loss of subsidiaries 0 0 0 0
Net gain (loss) on derivative instruments (90,846) (39,424) (76,471) 7,648
Interest expense, net of capitalized interest (34,979) (37,405) (73,718) (76,189)
Gain on extinguishment of debt 11,642 0 18,658 0
Other income (32) 191 447 121
Total other income (expense) (114,215) (76,638) (131,084) (68,420)
Loss before income taxes (142,429) (84,075) (234,513) (109,492)
Income tax benefit 52,498 30,845 80,127 38,221
Net loss (89,931) (53,230) (154,386) (71,271)
Consolidation, Eliminations [Member]        
Revenues        
Oil and gas revenues 0 0 0 0
Well services and midstream revenues 0 0 0 0
Total revenues 0 0 0 0
Operating expenses        
Lease operating expenses 0 0 0 0
Well services and midstream operating expenses 0 0 0 0
Marketing, transportation and gathering expenses 0 0 0 0
Production taxes 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Exploration expenses 0 0 0 0
Rig termination   0 0 0
Impairment 0 0 0 0
General and administrative expenses 0 0 0 0
Total operating expenses 0 0 0 0
Loss on sale of properties 0   0  
Operating loss 0 0 0 0
Other income (expense)        
Equity in loss of subsidiaries 71,987 34,249 109,314 21,630
Net gain (loss) on derivative instruments 0 0 0 0
Interest expense, net of capitalized interest 0 0 0 0
Gain on extinguishment of debt 0   0  
Other income 0 0 0 0
Total other income (expense) 71,987 34,249 109,314 21,630
Loss before income taxes 71,987 34,249 109,314 21,630
Income tax benefit 0 0 0 0
Net loss 71,987 34,249 109,314 21,630
Parent/Issuer [Member]        
Revenues        
Oil and gas revenues 0 0 0 0
Well services and midstream revenues 0 0 0 0
Total revenues 0 0 0 0
Operating expenses        
Lease operating expenses 0 0 0 0
Well services and midstream operating expenses 0 0 0 0
Marketing, transportation and gathering expenses 0 0 0 0
Production taxes 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Exploration expenses 0 0 0 0
Rig termination   0 0 0
Impairment 0 0 0 0
General and administrative expenses 6,395 6,325 13,846 14,944
Total operating expenses 6,395 6,325 13,846 14,944
Loss on sale of properties 0   0  
Operating loss (6,395) (6,325) (13,846) (14,944)
Other income (expense)        
Equity in loss of subsidiaries (71,987) (34,249) (109,314) (21,630)
Net gain (loss) on derivative instruments 0 0 0 0
Interest expense, net of capitalized interest (33,190) (34,194) (68,022) (69,415)
Gain on extinguishment of debt 11,642   18,658  
Other income 0 5 43 4
Total other income (expense) (93,535) (68,438) (158,635) (91,041)
Loss before income taxes (99,930) (74,763) (172,481) (105,985)
Income tax benefit 9,999 21,533 18,095 34,714
Net loss (89,931) (53,230) (154,386) (71,271)
Combined Guarantor Subsidiaries [Member]        
Revenues        
Oil and gas revenues 159,337 214,110 276,652 387,969
Well services and midstream revenues 19,743 15,936 32,711 22,464
Total revenues 179,080 230,046 309,363 410,433
Operating expenses        
Lease operating expenses 31,523 37,761 62,587 76,886
Well services and midstream operating expenses 8,875 7,395 13,264 9,347
Marketing, transportation and gathering expenses 6,491 7,570 15,043 14,848
Production taxes 14,367 20,618 25,120 37,239
Depreciation, depletion and amortization 122,488 119,218 244,937 237,696
Exploration expenses 340 1,082 703 1,925
Rig termination   2,815 0 3,895
Impairment 23 19,516 3,585 24,837
General and administrative expenses 15,481 15,183 32,396 29,888
Total operating expenses 199,588 231,158 397,635 436,561
Loss on sale of properties (1,311)   (1,311)  
Operating loss (21,819) (1,112) (89,583) (26,128)
Other income (expense)        
Equity in loss of subsidiaries 0 0 0 0
Net gain (loss) on derivative instruments (90,846) (39,424) (76,471) 7,648
Interest expense, net of capitalized interest (1,789) (3,211) (5,696) (6,774)
Gain on extinguishment of debt 0   0  
Other income (32) 186 404 117
Total other income (expense) (92,667) (42,449) (81,763) 991
Loss before income taxes (114,486) (43,561) (171,346) (25,137)
Income tax benefit 42,499 9,312 62,032 3,507
Net loss $ (71,987) $ (34,249) $ (109,314) $ (21,630)