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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues                      
Oil and gas revenues                 $ 1,034,892 $ 625,233 $ 721,672
Purchased oil and gas sales                 87,989 10,272 0
Midstream revenues                 72,752 35,406 23,769
Well services revenues                 52,791 33,754 44,294
Total revenues $ 404,469 $ 304,748 $ 254,091 $ 285,116 $ 217,991 $ 177,311 $ 179,080 $ 130,283 1,248,424 704,665 789,735
Operating expenses                      
Lease operating expenses                 177,134 135,444 144,481
Midstream operating expenses                 17,589 9,003 6,198
Well services operating expenses                 37,228 20,675 24,782
Marketing, transportation and gathering expenses                 55,740 30,108 31,610
Purchased oil and gas expenses                 89,320 10,258 0
Production taxes                 88,133 56,565 69,584
Depreciation, depletion and amortization                 530,802 476,331 485,322
Exploration expenses                 11,600 1,785 2,369
Rig termination                 0 0 3,895
Impairment                 6,887 4,684 46,109
General and administrative expenses                 91,797 89,342 89,549
Total operating expenses                 1,106,230 834,195 903,899
Gain (loss) on sale of properties                 1,774 (1,303) 0
Operating income (loss) 86,103 32,394 5,379 20,092 (1,702) (25,702) (28,214) (75,215) 143,968 (130,833) (114,164)
Other income (expense)                      
Net gain (loss) on derivative instruments                 (71,657) (105,317) 210,376
Interest expense, net of capitalized interest                 (146,837) (140,305) (149,648)
Gain on extinguishment of debt                 0 4,741 0
Other income (expense)                 (1,332) 160 (2,935)
Total other income (expense)                 (219,826) (240,721) 57,793
Loss before income taxes                 (75,858) (371,554) (56,371)
Income tax benefit                 203,304 128,538 16,123
Net income (loss) including non-controlling interests 128,117 (41,064) 16,568 23,825 (54,688) (33,942) (89,931) (64,455) 127,446 (243,016) (40,248)
Less: Net income attributable to non-controlling interests                 3,650 0 0
Net income (loss) attributable to Oasis $ 124,617 $ (41,214) $ 16,568 $ 23,825 $ (54,688) $ (33,942) $ (89,931) $ (64,455) $ 123,796 $ (243,016) $ (40,248)
Earnings (loss) attributable to Oasis per share:                      
Basic (in dollars per share) $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.25) $ (0.19) $ (0.51) $ (0.40) $ 0.53 $ (1.32) $ (0.31)
Diluted (in dollars per share) $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.25) $ (0.19) $ (0.51) $ (0.40) $ 0.52 $ (1.32) $ (0.31)
Weighted average shares outstanding:                      
Basic (in shares)                 234,986 183,615 130,186
Diluted (in shares)                 237,875 183,615 130,186