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Condensed Consolidated Statement of Operations (Unaudited) - USD ($)
shares in Thousands, $ 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)        
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 (expense) (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)
Loss per share:        
Basic (in dollars per share) $ (0.51) $ (0.39) $ (0.91) $ (0.58)
Diluted (in dollars per share) $ (0.51) $ (0.39) $ (0.91) $ (0.58)
Weighted average shares outstanding:        
Basic (in shares) 176,984 136,859 169,953 123,157
Diluted (in shares) 176,984 136,859 169,953 123,157