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Revenue (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Apr. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 20, 2026 | Dec. 31, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |
Interval period, between lifting |  |  |  |  | 30 days |  |  |  |
Income taxes paid in-kind with crude oil | $ 6,900 | $ 1,900 | $ 6,883 |  | $ 8,738 | $ 7,347 |  |  |
Foreign income taxes receivable |  |  | $ 1,124 |  | $ 1,124 |  |  |  |
Foreign taxes payable attributable to sharing obligation |  |  |  |  |  |  |  | $ 5,700 |
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] | Consortium [Member] |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |
Monthly royalty rate, based on production at the published price |  |  |  |  | 13.00% |  |  |  |
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] |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |
Purchase agreement payment period |  |  |  |  | 30 days |  |  |  |
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] |  |  |  |  |  |  |  |  |
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% |  | 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] | 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 |  |  | 7.50% |  | 7.50% |  |  |  |
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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