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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total revenues $ 599,755 $ 674,629 $ 573,751 $ 473,812 $ 434,875 $ 320,283 $ 260,809 $ 277,752 $ 2,321,947 $ 1,293,719 $ 704,665
Operating expenses                      
Lease operating expenses                 193,912 177,134 135,444
Marketing, transportation and gathering expenses                 107,193 55,740 30,108
Production taxes                 133,696 88,133 56,565
Depreciation, depletion and amortization                 636,296 530,802 476,331
Exploration expenses                 27,432 11,600 1,785
Impairment                 384,228 6,887 4,684
General and administrative expenses                 121,346 91,797 89,342
Total operating expenses   532,453 818,379 360,827 350,546 287,889 255,430 257,660 2,231,522 1,151,525 834,195
Gain (loss) on sale of properties                 28,587 1,774 (1,303)
Operating income (loss) 69,656 179,045 (242,674) 112,985 86,103 32,394 5,379 20,092 119,012 143,968 (130,833)
Other income (expense)                      
Net gain (loss) on derivative instruments                 28,457 (71,657) (105,317)
Interest expense, net of capitalized interest                 (159,085) (146,837) (140,305)
Gain (loss) on extinguishment of debt                 (13,848) 0 4,741
Other income (expense)                 121 (1,332) 160
Total other expense                 (144,355) (219,826) (240,721)
Loss before income taxes                 (25,343) (75,858) (371,554)
Income tax benefit                 5,843 203,304 128,538
Net income (loss) including non-controlling interests 226,866 66,223 (316,301) 3,712 128,117 (41,064) 16,568 23,825 (19,500) 127,446 (243,016)
Less: Net income attributable to non-controlling interests                 15,796 3,650 0
Net income (loss) attributable to Oasis $ 221,977 $ 62,341 $ (320,204) $ 590 $ 124,617 $ (41,214) $ 16,568 $ 23,825 $ (35,296) $ 123,796 $ (243,016)
Earnings (loss) attributable to Oasis per share:                      
Basic (in dollars per share) $ 0.71 $ 0.20 $ (1.02) $ 0.00 $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.11) $ 0.53 $ (1.32)
Diluted (in dollars per share) $ 0.70 $ 0.20 $ (1.02) $ 0.00 $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.11) $ 0.52 $ (1.32)
Weighted average shares outstanding:                      
Basic (in shares)                 307,480 234,986 183,615
Diluted (in shares)                 307,480 237,875 183,615
Oil and gas                      
Total revenues   $ 454,195 $ 397,849 $ 366,595 $ 330,290 $ 248,576 $ 218,523 $ 237,245 $ 1,590,024 $ 1,034,634 $ 625,233
Purchased oil and gas                      
Total revenues   172,985 128,064 67,709 61,547 36,802 14,919 20,274 551,808 133,542 10,272
Operating expenses                      
Operating expenses   $ 174,269 $ 129,579 $ 70,594 $ 62,043 $ 37,236 $ 14,698 $ 20,638 554,307 134,615 10,258
Midstream                      
Total revenues                 119,040 72,752 35,406
Operating expenses                      
Operating expenses                 31,912 17,589 9,003
Well services                      
Total revenues                 61,075 52,791 33,754
Operating expenses                      
Operating expenses                 $ 41,200 $ 37,228 $ 20,675