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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  |  | 37.50% | (53.00%)
Change in valuation allowance, discrete item | $ 22,300,000 |  | $ 22,300,000 |
Change in valuation allowance |  |  | (15,800,000) |
Current tax expense | 5,516,000 | $ 2,393,000 | 15,099,000 | $ 1,876,000
Favorable oil price adjustment | 200,000 |  | 1,700,000 |
Current tax expense, net of favorable oil price adjustment | $ 5,300,000 |  | 13,400,000 |
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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