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Condensed Consolidated Statement of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues        
Oil and gas revenues $ 214,110 $ 354,182 $ 387,969 $ 686,029
Well services and midstream revenues 15,936 18,196 22,464 35,868
Total revenues 230,046 372,378 410,433 721,897
Operating expenses        
Lease operating expenses 37,761 40,553 76,886 80,542
Well services and midstream operating expenses 7,395 8,769 9,347 19,689
Marketing, transportation and gathering expenses 7,570 7,114 14,848 12,300
Production taxes 20,618 34,493 37,239 66,296
Depreciation, depletion and amortization 119,218 97,276 237,696 188,548
Exploration expenses 1,082 475 1,925 855
Rig termination 2,815 0 3,895 0
Impairment of oil and gas properties 19,516 42 24,837 804
General and administrative expenses 21,508 20,751 44,832 44,271
Total operating expenses 237,483 209,473 451,505 413,305
Gain on sale of properties 0 3,640 0 187,033
Operating income (loss) (7,437) 166,545 (41,072) 495,625
Other income (expense)        
Net gain (loss) on derivative instruments (39,424) (65,570) 7,648 (83,173)
Interest expense, net of capitalized interest (37,405) (38,990) (76,189) (79,148)
Other income (expense) 191 135 121 288
Total other income (expense) (76,638) (104,425) (68,420) (162,033)
Income (loss) before income taxes (84,075) 62,120 (109,492) 333,592
Income tax benefit (expense) 30,845 (23,287) 38,221 (124,806)
Net income (loss) $ (53,230) $ 38,833 $ (71,271) $ 208,786
Earnings (loss) per share:        
Basic (in dollars per share) $ (0.39) $ 0.39 $ (0.58) $ 2.10
Diluted (in dollars per share) $ (0.39) $ 0.39 $ (0.58) $ 2.08
Weighted average shares outstanding:        
Basic (in shares) 136,859 99,663 123,157 99,612
Diluted (in shares) 136,859 100,260 123,157 100,328