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Dispositions (Assets and Liabilities Attributable to Discontinued Operations) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets |  | $ 3,290
Total current liabilities | $ 350 | 15,245
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 |  | 3,290
Total current assets |  | 3,290
Total assets |  | 3,290
Accounts payable | 8 | 73
Accrued liabilities and other | 342 | 15,172
Total current liabilities | 350 | 15,245
Total liabilities | $ 350 | $ 15,245

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