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Acquisitions and Dispositions (Pro Forma Results of Acquisition) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Business Acquisition [Line Items] |  |
Basic weighted average shares outstanding | 58,702 | 57,636
Diluted weighted average shares outstanding | 59,179 | 58,461
Sasol Gabon S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Crude oil and natural gas sales |  | $ 57,547
Operating income |  | 25,025
Net income |  | $ 11,736
Income from continuing operations |  | $ 0.20
Net income per share |  | $ 0.20
Basic weighted average shares outstanding |  | 57,636
Income from continuing operations |  | $ 0.20
Net income (loss) per share |  | $ 0.20
Diluted weighted average shares outstanding |  | 58,461
Sasol Gabon S.A. [Member] | Bargain Purchase Gain [Member] |  |
Business Acquisition [Line Items] |  |
Net income (loss) |  | $ 7,700
Sasol Gabon S.A. [Member] | Acquisition-related Costs [Member] |  |
Business Acquisition [Line Items] |  |
Net income (loss) |  | $ 1,000

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