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Dispositions (Assets And Liabilities Attributable To Discontinued Operations) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets | $ 3,222 | $ 2,836
Total current liabilities | 15,191 | 15,347
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 joint venture owners | 3,222 | 2,836
Total current assets | 3,222 | 2,836
Total assets | 3,222 | 2,836
Accounts payable | 32 | 158
Accrued liabilities and other | 15,159 | 15,189
Total current liabilities | 15,191 | 15,347
Total liabilities | $ 15,191 | $ 15,347

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