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Acquisitions and Dispositions (Summarized Results of Discontinued Operations) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations |  | $ (98,000) | $ 5,411,000 | $ (496,000)
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on settlement of drilling obligation |  |  | (7,193,000) |
General and administrative expense |  | 93,000 | 344,000 | 467,000
Total operating costs, expenses and (recovery) |  | 93,000 | (6,849,000) | 467,000
Operating income (loss) |  | (93,000) | 6,849,000 | (467,000)
Other, net |  | (5,000) |  | (29,000)
Total other expense |  | (5,000) |  | (29,000)
Income (loss) from discontinued operations before income taxes |  | (98,000) | 6,849,000 | (496,000)
Income tax expense (benefit) |  |  | 1,438,000 |
Income (loss) from discontinued operations | $ 5,700,000 | $ (98,000) | $ 5,411,000 | $ (496,000)

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