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Quarterly Financial Data - Unaudited (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Results of Operations | The following tables set forth the Company’s results of operations by quarter for the years ended December 31, 2018 and 2017, including effects of the revision discussed within Note 2 — Summary of Significant Accounting Policies to the 2018 and 2017 previously issued unaudited quarterly financial results. The 2018 quarterly revisions will be adjusted in connection with the future 2019 unaudited interim condensed consolidated financial statement filings on Form 10-Q.
| For the Year Ended December 31, 2018
| First Quarter(1) |  | Second Quarter(1) |  | Third Quarter(1) |  | Fourth Quarter
| (In thousands, except per share data)
Total revenues | $ | 473,812 |  |  | $ | 573,751 |  |  | $ | 674,629 |  |  | $ | 599,755 |
Operating income (loss) | 112,985 |  |  | (242,674 | ) |  | 179,045 |  |  | 69,656 |
Net income (loss) including non-controlling interests | 3,712 |  |  | (316,301 | ) |  | 66,223 |  |  | 226,866 |
Net income (loss) attributable to Oasis | 590 |  |  | (320,204 | ) |  | 62,341 |  |  | 221,977 |
Earnings (loss) attributable to Oasis per share: |  |  |  |  |  |  |
Basic | $ | 0.00 |  |  | $ | (1.02 | ) |  | $ | 0.20 |  |  | $ | 0.71 |
Diluted | $ | 0.00 |  |  | $ | (1.02 | ) |  | $ | 0.20 |  |  | $ | 0.70 |
| For the Year Ended December 31, 2017
| First Quarter(1) |  | Second Quarter(1) |  | Third Quarter(1) |  | Fourth Quarter(1)
| (In thousands, except per share data)
Total revenues | $ | 277,752 |  |  | $ | 260,809 |  |  | $ | 320,283 |  |  | $ | 434,875 |
Operating income | 20,092 |  |  | 5,379 |  |  | 32,394 |  |  | 86,103 |
Net income (loss) including non-controlling interests | 23,825 |  |  | 16,568 |  |  | (41,064 | ) |  | 128,117 |
Net income (loss) attributable to Oasis | 23,825 |  |  | 16,568 |  |  | (41,214 | ) |  | 124,617 |
Earnings (loss) attributable to Oasis per share: |  |  |  |  |  |  |
Basic | $ | 0.10 |  |  | $ | 0.07 |  |  | $ | (0.18 | ) |  | $ | 0.52 |
Diluted | $ | 0.10 |  |  | $ | 0.07 |  |  | $ | (0.18 | ) |  | $ | 0.52 |
__________________
(1) | For the quarters during the years ended December 31, 2018 and 2017, the impacts of the revision to the Company's Consolidated Statements of Operations are presented in the following tables:
| Quarter Ended March 31, 2018
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 363,671 |  |  | $ | 2,924 |  |  | $ | 366,595 |
Purchased oil and gas sales | 18,037 |  |  | 49,672 |  |  | 67,709 |
Total revenues | 421,216 |  |  | 52,596 |  |  | 473,812 |
Purchased oil and gas expenses | 17,998 |  |  | 52,596 |  |  | 70,594 |
Total operating expenses | 308,231 |  |  | 52,596 |  |  | 360,827 |
Operating income | 112,985 |  |  | — |  |  | 112,985 |
Net income including non-controlling interests | 3,712 |  |  | — |  |  | 3,712 |
Net income attributable to Oasis | 590 |  |  | — |  |  | 590 |
Earnings attributable to Oasis per share: |  |  |  |  |
Basic | $ | 0.00 |  |  | $ | — |  |  | $ | 0.00 |
Diluted | $ | 0.00 |  |  | $ | — |  |  | $ | 0.00 |
| Quarter Ended June 30, 2018
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 395,921 |  |  | $ | 1,928 |  |  | $ | 397,849 |
Purchased oil and gas sales | 57,578 |  |  | 70,486 |  |  | 128,064 |
Total revenues | 501,337 |  |  | 72,414 |  |  | 573,751 |
Purchased oil and gas expenses | 57,165 |  |  | 72,414 |  |  | 129,579 |
Total operating expenses | 745,965 |  |  | 72,414 |  |  | 818,379 |
Operating loss | (242,674 | ) |  | — |  |  | (242,674 | )
Net loss including non-controlling interests | (316,301 | ) |  | — |  |  | (316,301 | )
Net loss attributable to Oasis | (320,204 | ) |  | — |  |  | (320,204 | )
Loss attributable to Oasis per share: |  |  |  |  |
Basic | $ | (1.02 | ) |  | $ | — |  |  | $ | (1.02 | )
Diluted | $ | (1.02 | ) |  | $ | — |  |  | $ | (1.02 | )
| Quarter Ended September 30, 2018
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 452,643 |  |  | $ | 1,552 |  |  | $ | 454,195 |
Purchased oil and gas sales | 46,356 |  |  | 126,629 |  |  | 172,985 |
Total revenues | 546,448 |  |  | 128,181 |  |  | 674,629 |
Purchased oil and gas expenses | 46,088 |  |  | 128,181 |  |  | 174,269 |
Total operating expenses | 404,272 |  |  | 128,181 |  |  | 532,453 |
Operating income | 179,045 |  |  | — |  |  | 179,045 |
Net income including non-controlling interests | 66,223 |  |  | — |  |  | 66,223 |
Net income attributable to Oasis | 62,341 |  |  | — |  |  | 62,341 |
Earnings attributable to Oasis per share: |  |  |  |  |
Basic | $ | 0.20 |  |  | $ | — |  |  | $ | 0.20 |
Diluted | $ | 0.20 |  |  | $ | — |  |  | $ | 0.20 |
| Quarter Ended March 31, 2017
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 237,252 |  |  | $ | (7 | ) |  | $ | 237,245 |
Purchased oil and gas sales | 27,631 |  |  | (7,357 | ) |  | 20,274 |
Total revenues | 285,116 |  |  | (7,364 | ) |  | 277,752 |
Purchased oil and gas expenses | 28,002 |  |  | (7,364 | ) |  | 20,638 |
Total operating expenses | 265,024 |  |  | (7,364 | ) |  | 257,660 |
Operating income | 20,092 |  |  | — |  |  | 20,092 |
Net income including non-controlling interests | 23,825 |  |  | — |  |  | 23,825 |
Net income attributable to Oasis | 23,825 |  |  | — |  |  | 23,825 |
Earnings attributable to Oasis per share: |  |  |  |  |
Basic | $ | 0.10 |  |  | $ | — |  |  | $ | 0.10 |
Diluted | $ | 0.10 |  |  | $ | — |  |  | $ | 0.10 |
| Quarter Ended June 30, 2017
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 218,633 |  |  | $ | (110 | ) |  | $ | 218,523 |
Purchased oil and gas sales | 8,091 |  |  | 6,828 |  |  | 14,919 |
Total revenues | 254,091 |  |  | 6,718 |  |  | 260,809 |
Purchased oil and gas expenses | 7,980 |  |  | 6,718 |  |  | 14,698 |
Total operating expenses | 248,712 |  |  | 6,718 |  |  | 255,430 |
Operating income | 5,379 |  |  | — |  |  | 5,379 |
Net income including non-controlling interests | 16,568 |  |  | — |  |  | 16,568 |
Net income attributable to Oasis | 16,568 |  |  | — |  |  | 16,568 |
Earnings attributable to Oasis per share: |  |  |  |  |
Basic | $ | 0.07 |  |  | $ | — |  |  | $ | 0.07 |
Diluted | $ | 0.07 |  |  | $ | — |  |  | $ | 0.07 |
| Quarter Ended September 30, 2017
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 248,648 |  |  | $ | (72 | ) |  | $ | 248,576 |
Purchased oil and gas sales | 21,195 |  |  | 15,607 |  |  | 36,802 |
Total revenues | 304,748 |  |  | 15,535 |  |  | 320,283 |
Purchased oil and gas expenses | 21,701 |  |  | 15,535 |  |  | 37,236 |
Total operating expenses | 272,354 |  |  | 15,535 |  |  | 287,889 |
Operating income | 32,394 |  |  | — |  |  | 32,394 |
Net loss including non-controlling interests | (41,064 | ) |  | — |  |  | (41,064 | )
Net loss attributable to Oasis | (41,214 | ) |  | — |  |  | (41,214 | )
Loss attributable to Oasis per share: |  |  |  |  |
Basic | $ | (0.18 | ) |  | $ | — |  |  | $ | (0.18 | )
Diluted | $ | (0.18 | ) |  | $ | — |  |  | $ | (0.18 | )
| Quarter Ended December 31, 2017
| As Reported |  | Revision |  | As Revised
| (In thousands, except per share data)
Oil and gas revenues | $ | 330,359 |  |  | $ | (69 | ) |  | $ | 330,290 |
Purchased oil and gas sales | 31,072 |  |  | 30,475 |  |  | 61,547 |
Total revenues | 404,469 |  |  | 30,406 |  |  | 434,875 |
Purchased oil and gas expenses | 31,637 |  |  | 30,406 |  |  | 62,043 |
Total operating expenses | 320,140 |  |  | 30,406 |  |  | 350,546 |
Operating income | 86,103 |  |  | — |  |  | 86,103 |
Net income including non-controlling interests | 128,117 |  |  | — |  |  | 128,117 |
Net income attributable to Oasis | 124,617 |  |  | — |  |  | 124,617 |
Earnings attributable to Oasis per share: |  |  |  |  |
Basic | $ | 0.52 |  |  | $ | — |  |  | $ | 0.52 |
Diluted | $ | 0.52 |  |  | $ | — |  |  | $ | 0.52 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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