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Dispositions (Summarized Results of Discontinued Operations) (Details) - USD ($) | 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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations | $ (37,000) | $ (61,000) | $ (162,000) | $ 5,671,000 | $ (80,000) | $ (21,000) | $ (343,000) | $ (52,000) | $ 5,411,000 | $ (496,000) | $ (621,000)
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 |  |  |  |  |  |  |  |  | 344,000 | 467,000 | 615,000
Total operating costs, expenses and (recovery) |  |  |  |  |  |  |  |  | (6,849,000) | 467,000 | 615,000
Operating income (loss) |  |  |  |  |  |  |  |  | 6,849,000 | (467,000) | (615,000)
Other, net |  |  |  |  |  |  |  |  |  | (29,000) | (3,000)
Total other income (expense) |  |  |  |  |  |  |  |  |  | (29,000) | (3,000)
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 6,849,000 | (496,000) | (618,000)
Income tax expense |  |  |  |  |  |  |  |  | 1,438,000 |  | 3,000
Income (loss) from discontinued operations |  |  |  | $ 5,700,000 |  |  |  |  | $ 5,411,000 | $ (496,000) | $ (621,000)

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