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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Income Taxes [Line Items] |  |
Effective income tax rate | (68.00%) | 77.00%
Uncertain tax positions | $ 0 |
Change In Crude Oils Prices [Member] |  |
Income Taxes [Line Items] |  |
Change in valuation allowance | 23,100,000 |
Difference Between Cost Account and Book Basis of Oil and Gas Property [Member] |  |
Income Taxes [Line Items] |  |
Change in valuation allowance | (12,300,000) |
Basis Differences In Fixed Assets And Net Operating Loss Carryforwards [Member] |  |
Income Taxes [Line Items] |  |
Change in valuation allowance | $ (11,500,000) |
Authorities Other Than United States And Gabon [Member] |  |
Income Taxes [Line Items] |  |
Effective income tax rate | 0.00% |

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