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Condensed Consolidated Statement of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenues        
Oil and gas revenues $ 158,183 $ 175,270 $ 434,835 $ 563,239
Well services and midstream revenues 19,128 21,965 51,839 44,429
Total revenues 177,311 197,235 486,674 607,668
Operating expenses        
Lease operating expenses 35,696 35,670 98,283 112,556
Well services and midstream operating expenses 8,165 10,023 21,429 19,370
Marketing, transportation and gathering expenses 8,856 8,465 23,899 23,313
Production taxes 14,638 16,676 39,758 53,915
Depreciation, depletion and amortization 111,948 123,734 356,885 361,430
Exploration expenses 489 327 1,192 2,252
Rig termination 0 0 0 3,895
Impairment 382 80 3,967 24,917
General and administrative expenses 22,845 22,358 69,087 67,190
Total operating expenses 203,019 217,333 614,500 668,838
Gain (loss) on sale of properties 6 172 (1,305) 172
Operating loss (25,702) (19,926) (129,131) (60,998)
Other income (expense)        
Net gain (loss) on derivative instruments 20,847 103,637 (55,624) 111,285
Interest expense, net of capitalized interest (31,726) (36,513) (105,444) (112,702)
Gain (loss) on extinguishment of debt (13,793) 0 4,865 0
Other income (expense) (259) 249 188 370
Total other income (expense) (24,931) 67,373 (156,015) (1,047)
Income (loss) before income taxes (50,633) 47,447 (285,146) (62,045)
Income tax benefit (expense) 16,691 (20,392) 96,818 17,829
Net income (loss) $ (33,942) $ 27,055 $ (188,328) $ (44,216)
Earnings (loss) per share:        
Basic (in dollars per share) $ (0.19) $ 0.20 $ (1.09) $ (0.35)
Diluted (in dollars per share) $ (0.19) $ 0.20 $ (1.09) $ (0.35)
Weighted average shares outstanding:        
Basic (in shares) 177,120 137,014 172,360 127,827
Diluted (in shares) 177,120 137,014 172,360 127,827