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Acquisitions and Dispositions (Narrative) (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 25, 2021 USD ($) $ / bbl | Nov. 17, 2020 USD ($) | Jul. 31, 2019 USD ($) | Nov. 30, 2006 | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 24, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  | $ (98,000) | $ 5,411,000 | $ (496,000) |
Cash paid |  |  |  |  |  | 20,008,000 | 10,348,000 | 14,127,000 |
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% |  |  |  |  |
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Liability for the potential payment |  |  |  |  | $ 4,500,000 |  |  |  |
Write off of receivable |  |  |  |  | 3,300,000 |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  | $ 5,700,000 | (98,000) | $ 5,411,000 | $ (496,000) |
Payment for settlement |  |  | $ 4,500,000 |  |  |  |  |  |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Liability for the potential payment |  |  | $ 4,400,000 |  |  | $ 4,400,000 |  |  |
Etame Marine Block [Member] | Sasol Gabon S.A. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash paid |  | $ 4,300,000 |  |  |  |  |  |  |
Etame Marine Block [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Working interest ownership, percentage | 58.80% |  |  |  |  |  |  |  | 31.10%
Etame Marine Block [Member] | Subsequent Event [Member] | Sasol Gabon S.A. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 27.80% |  |  |  |  |  |  |  |
Effective date of acquisition | Jul. 01, 2020 |  |  |  |  |  |  |  |
Total consideration | $ 44,000,000.0 |  |  |  |  |  |  |  |
Cash paid | 29,600,000 |  |  |  |  |  |  |  |
Contingent consideration | $ 5,000,000.0 |  |  |  |  |  |  |  |
Contingent consideration, oil price threshold | $ / bbl | 60.00 |  |  |  |  |  |  |  |
Contingent consideration, oil price threshold measurement period | 90 days |  |  |  |  |  |  |  |

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