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Acquisitions And Dispositions (Summarized Results Of Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations | $ (15,783) | $ 853 | $ (7,997) | $ (27,831)
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 | 15,269 | 32 | 15,270 | 27,878
Depreciation, depletion and amortization | 3 | 3 | 9 | 9
General and administrative expense | 400 | 1,135 | 994 | 2,127
Bad debt expense (recovery) and other |  |  | (7,629) |
Total operating costs and expenses | 15,672 | 1,170 | 8,644 | 30,014
Other operating income (loss), net | (7) |  | (28) |
Operating income (loss) | (15,679) | (1,170) | (8,672) | (30,014)
Interest income |  |  | 3,201 |
Other, net | 6 | 2,023 | 551 | 2,183
Total other income | 6 | 2,023 | 3,752 | 2,183
Income (loss) from discontinued operations before income taxes | (15,673) | 853 | (4,920) | (27,831)
Income tax expense | 110 |  | 3,077 |
Income (loss) from discontinued operations | $ (15,783) | $ 853 | $ (7,997) | $ (27,831)

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