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Assets Held for Sale and Discontinued Operations - Results of Operations Associated with Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues | $ 4,090 | $ 1,364,943 | $ 854,251 |
Lease operating expense | 0 | 127,138 | 202,062 |
Depreciation, depletion and amortization | 0 | 33,697 | 196,287 |
Other costs and expenses (benefits) | 11,241 | 81,538 | 70,088 |
Total income from discontinued operations before taxes | (7,151) | 1,122,570 | 385,814 |
Income tax expense | 0 | 58,083 | 135,466 |
Income from discontinued operations | $ (7,151) | 1,064,487 | $ 250,348 | [1]
Malaysia |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposition of business |  | $ 985,400 |  |
[1] | Reclassified to conform with current presentation

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