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Condensed Consolidated Statement of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues    
Oil and gas revenues $ 363,671 $ 237,252
Purchased oil and gas sales 18,037 27,631
Midstream revenues 27,922 14,606
Well services revenues 11,586 5,627
Total revenues 421,216 285,116
Operating expenses    
Lease operating expenses 44,781 43,872
Midstream operating expenses 7,985 3,327
Well services operating expenses 7,387 4,560
Marketing, transportation and gathering expenses 21,013 10,951
Purchased oil and gas expenses 17,998 28,002
Production taxes 31,000 20,299
Depreciation, depletion and amortization 149,265 126,666
Exploration expenses 769 1,489
Impairment 93 2,682
General and administrative expenses 27,940 23,176
Total operating expenses 308,231 265,024
Operating income 112,985 20,092
Other income (expense)    
Net gain (loss) on derivative instruments (71,116) 56,075
Interest expense, net of capitalized interest (37,146) (36,321)
Other income (expense) (183) 16
Total other income (expense) (108,445) 19,770
Income before income taxes 4,540 39,862
Income tax expense (828) (16,037)
Net income including non-controlling interests 3,712 23,825
Less: Net income attributable to non-controlling interests 3,122 0
Net income attributable to Oasis $ 590 $ 23,825
Earnings attributable to Oasis per share:    
Basic (in dollars per share) $ 0.00 $ 0.10
Diluted (in dollars per share) $ 0.00 $ 0.10
Weighted average shares outstanding:    
Basic (in shares) 290,105 233,068
Diluted (in shares) 291,738 237,900