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Acquisitions And Dispositions (Summarized Results Of Discontinued Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss from discontinued operations | $ (8,283) | $ (38,102) | $ (3,797)
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 | 36,044 | 1,707
Depreciation, depletion and amortization | 9 | 12 | 12
General and administrative expense | 1,269 | 2,535 | 2,082
Bad debt expense (recovery) and other | (7,629) |  |
Total operating costs and expenses | 8,786 | 38,591 | 3,801
Other operating loss, net | (172) | (1,856) |
Operating loss | (8,958) | (40,447) | (3,801)
Interest income | 3,201 |  |
Other, net | 552 | 2,345 | 4
Total other income | 3,753 | 2,345 | 4
Loss from discontinued operations before income taxes | (5,205) | (38,102) | (3,797)
Income tax expense | 3,078 |  |
Loss from discontinued operations | $ (8,283) | $ (38,102) | $ (3,797)

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