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Acquisitions and Dispositions (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 29, 2021 USD ($) | Feb. 25, 2021 USD ($) $ / bbl | Nov. 30, 2006 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 24, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |
Bargain purchase gain |  |  |  | $ (7,651) |  |  |
Revenues |  |  |  | 199,075 | $ 67,176 | $ 84,521 |
Net income |  |  |  | 81,836 | $ (48,181) | $ 2,563 |
Sasol Gabon S.A. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Bargain purchase gain |  | $ (7,700) |  |  |  |  |
Bargain purchase gain, net of tax |  | 5,200 |  |  |  |  |
Bargain purchase gain, income tax benefit |  | 4,100 |  |  |  |  |
Revenues |  |  |  | 84,600 |  |  |
Net income |  |  |  | $ 29,300 |  |  |
Contingent consideration |  | $ 5,000 |  |  |  |  |
Contingent consideration, measurement period of oil price |  | 90 days |  |  |  |  |
Contingent consideration, oil price threshold | $ / bbl |  | 60.00 |  |  |  |  |
Contingent consideration paid | $ 5,000 |  |  |  |  |  |
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Joint operation agreement related to third party in working interest percentage |  |  | 40.00% |  |  |  |
Additional joint operation agreement related to third party in working interest percentage |  |  | 10.00% |  |  |  |
Etame Marine Block [Member] | Sasol Gabon S.A. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage |  | 27.80% |  |  |  |  |
Working interest ownership, percentage |  | 58.80% |  |  |  |  | 31.10%

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