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Dispositions (Summarized Results Of Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss from discontinued operations | $ (21) | $ (174) | $ (416) | $ (518)
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] |  |  |  |
General and administrative expense | 23 | 174 | 387 | 512
Total operating costs and expenses | 23 | 174 | 387 | 512
Operating loss | (23) | (174) | (387) | (512)
Other, net | 2 |  | (29) | (3)
Total other expense | 2 |  | (29) | (3)
Loss from discontinued operations before income taxes | (21) | (174) | (416) | (515)
Income tax expense |  |  |  | 3
Loss from discontinued operations | $ (21) | $ (174) | $ (416) | $ (518)

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