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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Taxes [Line Items] |  |
Effective income tax rate | (64.00%) | (68.00%)
Change in valuation allowance | $ (2,300,000) |
Current tax expense | 3,435,000 | $ (1,563,000)
Favorable oil price adjustment | 500,000 |
Current tax expense, net of favorable oil price adjustment | 2,900,000 |
Uncertain tax positions | $ 0 |
Authorities Other Than United States And Gabon [Member] |  |
Income Taxes [Line Items] |  |
Effective income tax rate | 0.00% |

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