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Assets Held for Sale and Discontinued Operations (Results of Operations Associated with Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
(Loss) income from discontinued operations | $ (102) | $ (1,267) | $ 106 | $ (6,129) |
Discontinued Operation | Malaysian Exploration And Production Operations And U.K., U.S. Refining And Marketing Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenues | 246 | 1 | 658 | 4,074 |
Other costs and expenses (benefits) | 348 | 1,268 | 552 | 10,203 |
(Loss) income before taxes | (102) | (1,267) | 106 | (6,129) |
Income tax expense | 0 | 0 | 0 | 0 |
(Loss) income from discontinued operations | $ (102) | $ (1,267) | $ 106 | $ (6,129) |
Discontinued operations, held-for-sale or disposed of by sale | King's Quay Floating Production System |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Total current assets associated with assets held for sale |  |  |  |  | $ 250,100

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