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Dispositions (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2019 USD ($) | Nov. 30, 2006 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) item | Sep. 30, 2019 USD ($) | Dec. 31, 2015 item | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  | $ 11 | $ (61) |  | $ (41) | $ 5,448 |  |
Joint Operating With Republic Of Angola [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of wells drilled | item |  |  |  |  |  |  |  | 1 |
Number of drilled wells required by agreement | item |  |  |  |  |  | 3 |  |  |
Stipulated payment for each exploration well, under PSA terms |  |  |  |  |  | $ 10,000 |  |  |
Drilling commitment, net |  |  | 5,000 |  |  | 5,000 |  |  |
Liability for the potential payment |  |  |  |  |  |  |  |  | $ 15,000
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% |  |  |  |  |  |  |
Liability for the potential payment |  |  |  | 4,500 |  |  | 4,500 |  |
Write off of receivable |  |  |  |  |  |  | 3,300 |  |
Income (loss) from discontinued operations, net of tax |  |  | $ 11 | $ (61) | $ 5,700 | $ (41) | $ 5,448 |  |
Payment for settlement | $ 4,500 |  |  |  |  |  |  |  |

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