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Dispositions (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Nov. 30, 2006 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  | $ (61) |  |  | $ (21) | $ 5,448 | $ (416) |
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% |  |  |  |  |  |  |
Stipulated payment for each exploration well, under PSA terms |  | $ 10,000 |  |  |  |  |  |  |
Drilling commitment, net |  | $ 5,000 |  |  |  |  |  |  |
Liability for the potential payment |  |  |  | $ 4,500 |  |  |  |  | $ 15,000
Write off of receivable |  |  |  | 3,300 |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  | $ (61) | $ 5,700 | $ 5,700 | $ (21) | $ 5,448 | $ (416) |
Payment for settlement | $ 4,500 |  |  |  |  |  |  |  |

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