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Dispositions (Assets and Liabilities Attributable to Discontinued Operations) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current liabilities | $ 48 | $ 350
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 payable |  | 8
Accrued liabilities and other | 48 | 342
Total current liabilities | 48 | 350
Total liabilities | $ 48 | $ 350

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