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Condensed Consolidated Statement of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues        
Oil and gas revenues $ 218,633 $ 159,337 $ 455,885 $ 276,652
Bulk oil sales 8,091 0 35,722 0
Midstream revenues 15,566 6,910 30,172 13,893
Well services revenues 11,801 12,833 17,428 18,818
Total revenues 254,091 179,080 539,207 309,363
Operating expenses        
Lease operating expenses 44,665 31,523 88,537 62,587
Midstream operating expenses 3,263 1,740 6,590 3,478
Well services operating expenses 8,088 7,135 11,990 9,786
Marketing, transportation and gathering expenses 12,039 6,491 22,990 15,043
Bulk oil purchases 7,980 0 35,982 0
Production taxes 18,971 14,367 39,270 25,120
Depreciation, depletion and amortization 125,291 122,488 251,957 244,937
Exploration expenses 1,667 340 3,156 703
Impairment 3,200 23 5,882 3,585
General and administrative expenses 23,548 21,876 47,382 46,242
Total operating expenses 248,712 205,983 513,736 411,481
Loss on sale of properties 0 (1,311) 0 (1,311)
Operating income (loss) 5,379 (28,214) 25,471 (103,429)
Other income (expense)        
Net gain (loss) on derivative instruments 50,532 (90,846) 106,607 (76,471)
Interest expense, net of capitalized interest (36,838) (34,979) (73,159) (73,718)
Gain on extinguishment of debt 0 11,642 0 18,658
Other income (expense) (166) (32) (150) 447
Total other income (expense) 13,528 (114,215) 33,298 (131,084)
Income (loss) before income taxes 18,907 (142,429) 58,769 (234,513)
Income tax benefit (expense) (2,339) 52,498 (18,376) 80,127
Net income (loss) $ 16,568 $ (89,931) $ 40,393 $ (154,386)
Earnings (loss) per share:        
Basic (in dollars per share) $ 0.07 $ (0.51) $ 0.17 $ (0.91)
Diluted (in dollars per share) $ 0.07 $ (0.51) $ 0.17 $ (0.91)
Weighted average shares outstanding:        
Basic (in shares) 233,283 176,984 233,176 169,953
Diluted (in shares) 234,917 176,984 236,281 169,953