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Condensed Consolidated Statement of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenues        
Oil and gas revenues $ 175,270 $ 344,706 $ 563,239 $ 1,030,735
Well services and midstream revenues 21,965 23,953 44,429 59,821
Total revenues 197,235 368,659 607,668 1,090,556
Operating expenses        
Lease operating expenses 35,670 44,361 112,556 124,903
Well services and midstream operating expenses 10,023 14,922 19,370 34,611
Marketing, transportation and gathering expenses 8,465 7,306 23,313 19,606
Production taxes 16,676 34,584 53,915 100,880
Depreciation, depletion and amortization 123,734 106,972 361,430 295,520
Exploration expenses 327 1,100 2,252 1,955
Rig termination 0 0 3,895 0
Impairment of oil and gas properties 80 1,439 24,917 2,243
General and administrative expenses 22,358 23,915 67,190 68,186
Total operating expenses 217,333 234,599 668,838 647,904
Gain on sale of properties 172 43 172 187,076
Operating income (loss) (19,926) 134,103 (60,998) 629,728
Other income (expense)        
Net gain on derivative instruments 103,637 103,426 111,285 20,253
Interest expense, net of capitalized interest (36,513) (39,420) (112,702) (118,568)
Other income (expense) 249 (38) 370 250
Total other income (expense) 67,373 63,968 (1,047) (98,065)
Income (loss) before income taxes 47,447 198,071 (62,045) 531,663
Income tax benefit (expense) (20,392) (76,484) 17,829 (201,290)
Net income (loss) $ 27,055 $ 121,587 $ (44,216) $ 330,373
Earnings (loss) per share:        
Basic (in dollars per share) $ 0.20 $ 1.22 $ (0.35) $ 3.32
Diluted (in dollars per share) $ 0.20 $ 1.21 $ (0.35) $ 3.29
Weighted average shares outstanding:        
Basic (in shares) 137,014 99,715 127,827 99,647
Diluted (in shares) 137,014 100,306 127,827 100,356