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Acquisitions And Dispositions (Assets And Liabilities Attributable To Discontinued Operations) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets | $ 2,139 | $ 8,369
Total current liabilities | 18,452 | 4,129
Joint Operating With Republic Of Angola [Member] | Discontinued Operations [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accounts with partners | 2,138 | 8,091
Prepayments and other | 1 | 278
Total current assets | 2,139 | 8,369
Equipment and other |  | 143
Property and equipment-successful efforts method |  | 143
Accumulated depreciation, depletion, amortization and impairment |  | (127)
Net property and equipment |  | 16
Total assets | 2,139 | 8,385
Accounts payable | 77 | 2,708
Foreign taxes payable | 3,078 |
Accrued liabilities and other | 15,297 | 1,421
Total current liabilities | $ 18,452 | $ 4,129

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