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Dispositions (Summarized Results of Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income (loss) from discontinued operations | $ 11 | $ (162) |  | $ (52) | $ 5,509
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on settlement of drilling obligation |  |  |  |  | (7,193)
General and administrative expense (recovery) | (19) | 206 |  | 61 | 220
Total operating costs, expenses and (recovery) | (19) | 206 |  | 61 | (6,973)
Operating income (loss) | 19 | (206) |  | (61) | 6,973
Total other income (expense) | (5) |  |  | (5) |
Income (loss) from discontinued operations before income taxes | 14 | (206) |  | (66) | 6,973
Income tax expense (benefit) | 3 | (44) |  | (14) | 1,464
Income (loss) from discontinued operations | $ 11 | $ (162) | $ 5,700 | $ (52) | $ 5,509

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