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Revenue (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Jun. 20, 2026 | Dec. 31, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Interval period, between lifting | 1 month |  |  |
Purchase agreement payment period | 30 days |  |  |
Foreign taxes payable attributable to sharing obligation | $ 0.9 |  | $ 5.7 |
Minimum [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Lifting period, time to complete | 1 day |  |  |
Maximum [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Lifting period, time to complete | 2 days |  |  |
Prior Production Sharing Contract, Through September 17, 2018 [Member] | Government Of Gabon [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Monthly royalty rate, based on production at the published price | 13.00% |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Consortium [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Monthly royalty rate, based on production at the published price | 13.00% |  |  |
Etame Marine Block [Member] | Government Of Gabon [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Working interest ownership, percentage | 7.50% |  |  |
Monthly royalty rate, based on production at the published price | 13.00% |  |  |
Etame Marine Block [Member] | Prior Production Sharing Contract, Through September 17, 2018 [Member] | Consortium [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Working interest ownership, percentage | 7.50% |  |  |
Etame Marine Block [Member] | Prior Production Sharing Contract, Through September 17, 2018 [Member] | Government Of Gabon [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Working interest ownership, percentage |  |  |  | 7.50%
Etame Marine Block [Member] | Scenario, Forecast [Member] | Government Of Gabon [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Working interest ownership, percentage |  | 10.00% |  |
Etame Marine Block [Member] | Scenario, Forecast [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Government Of Gabon [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Working interest ownership, percentage |  | 10.00% |  |

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