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Acquisitions and Dispositions (Pro Forma Results of Acquisition) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Basic weighted average shares outstanding | 58,230 | 57,594 | 59,143
Diluted weighted average shares outstanding | 58,755 | 57,594 | 59,143
Sasol Gabon S.A. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Crude oil and natural gas sales | $ 216,848 | $ 127,199 |
Operating income (loss) | 89,782 | (16,902) |
Net income (loss) | $ 66,001 | $ (36,508) |
Income (loss) from continuing operations | $ 1.14 | $ (0.63) |
Loss from discontinued operations, net of tax | (0.01) |  |
Net income (loss) per share | $ 1.13 | $ (0.63) |
Basic weighted average shares outstanding | 58,230 | 57,594 |
Income (loss) from continuing operations | $ 1.12 | $ (0.63) |
Net income (loss) per share | $ 1.12 | $ (0.63) |
Diluted weighted average shares outstanding | 58,755 | 57,594 |
Sasol Gabon S.A. [Member] | Bargain Purchase Gain [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net income (loss) | $ 7,700 | $ 7,700 |
Sasol Gabon S.A. [Member] | Acquisition-related Costs [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net income (loss) | $ 1,000 | $ 1,000 |

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