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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total revenues $ 483,864 $ 482,743 $ 529,405 $ 575,732 $ 599,755 $ 674,629 $ 573,751 $ 473,812 $ 2,071,744 $ 2,321,947 $ 1,293,719
Operating expenses                      
Lease operating expenses                 223,384 193,912 177,134
Marketing, transportation and gathering expenses                 128,806 107,193 55,740
Production taxes                 112,592 133,696 88,133
Depreciation, depletion and amortization                 787,192 636,296 530,802
Exploration expenses                 6,658 27,432 11,600
Rig termination                 384 0 0
Impairment                 10,257 384,228 6,887
General and administrative expenses                 143,506 121,346 91,797
Total operating expenses                 1,912,866 2,231,522 1,151,525
Gain (loss) on sale of properties                 (4,455) 28,587 1,774
Operating income 23,966 8,441 71,572 50,444 69,656 179,045 (242,674) 112,985 154,423 119,012 143,968
Other income (expense)                      
Net gain (loss) on derivative instruments                 (106,314) 28,457 (71,657)
Interest expense, net of capitalized interest                 (176,223) (159,085) (146,837)
Gain (loss) on extinguishment of debt                 4,312 (13,848) 0
Other income (expense)                 440 121 (1,332)
Total other expense, net                 (277,785) (144,355) (219,826)
Loss before income taxes                 (123,362) (25,343) (75,858)
Income tax benefit                 32,715 5,843 203,304
Net income (loss) including non-controlling interests (64,154) 30,311 51,174 (107,978) 226,866 66,223 (316,301) 3,712 (90,647) (19,500) 127,446
Less: Net income attributable to non-controlling interests                 37,596 15,796 3,650
Net income (loss) attributable to Oasis $ (76,406) $ 20,288 $ 42,757 $ (114,882) $ 221,977 $ 62,341 $ (320,204) $ 590 $ (128,243) $ (35,296) $ 123,796
Earnings (loss) attributable to Oasis per share:                      
Basic (in dollars per share) $ (0.24) $ 0.06 $ 0.14 $ (0.37) $ 0.71 $ 0.20 $ (1.02) $ 0.00 $ (0.41) $ (0.11) $ 0.53
Diluted (in dollars per share) $ (0.24) $ 0.06 $ 0.14 $ (0.37) $ 0.70 $ 0.20 $ (1.02) $ 0.00 $ (0.41) $ (0.11) $ 0.52
Weighted average shares outstanding:                      
Basic (in shares)                 315,002 307,480 234,986
Diluted (in shares)                 315,002 307,480 237,875
Oil and gas                      
Total revenues                 $ 1,408,771 $ 1,590,024 $ 1,034,634
Purchased oil and gas                      
Total revenues                 408,791 550,344 133,542
Operating expenses                      
Operating expenses                 409,180 553,461 134,615
Midstream                      
Total revenues                 212,208 120,504 72,752
Operating expenses                      
Operating expenses                 62,146 32,758 17,589
Well Services                      
Total revenues                 41,974 61,075 52,791
Operating expenses                      
Operating expenses                 $ 28,761 $ 41,200 $ 37,228