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Acquisitions And Dispositions (Assets And Liabilities Attributable To Discontinued Operations) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets | $ 2,773 | $ 2,139
Total current liabilities | 15,400 | 18,452
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 | 2,773 | 2,139
Total current assets | 2,773 | 2,139
Total assets | 2,773 | 2,139
Accounts payable | 215 | 77
Foreign taxes payable |  | 3,078
Accrued liabilities and other | 15,185 | 15,297
Total current liabilities | 15,400 | 18,452
Total liabilities | $ 15,400 | $ 18,452

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