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Acquisitions And Dispositions (Summarized Results Of Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operations | $ (80) | $ (21) | $ (343) | $ (52) | $ (103) | $ (174) | $ (168) | $ (176) | $ (496) | $ (621) | $ (8,283)
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] |  |  |  |  |  |  |  |  |  |  |
Exploration expense |  |  |  |  |  |  |  |  |  |  | 15,137
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 9
General and administrative expense |  |  |  |  |  |  |  |  | 467 | 615 | 1,269
Bad debt recovery and other |  |  |  |  |  |  |  |  |  |  | (7,629)
Total operating costs, expenses and (recovery) |  |  |  |  |  |  |  |  | 467 | 615 | 8,786
Other operating loss, net |  |  |  |  |  |  |  |  |  |  | (172)
Operating loss |  |  |  |  |  |  |  |  | (467) | (615) | (8,958)
Interest income |  |  |  |  |  |  |  |  |  |  | 3,201
Other, net |  |  |  |  |  |  |  |  | (29) | (3) | 552
Total other income (expense) |  |  |  |  |  |  |  |  | (29) | (3) | 3,753
Loss from discontinued operations before income taxes |  |  |  |  |  |  |  |  | (496) | (618) | (5,205)
Income tax expense |  |  |  |  |  |  |  |  |  | 3 | 3,078
Loss from discontinued operations |  |  |  |  |  |  |  |  | $ (496) | $ (621) | $ (8,283)

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