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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, 2021 | Mar. 31, 2020
Business Acquisition [Line Items] |  |
Basic weighted average shares outstanding | 57,636 | 57,975
Diluted weighted average shares outstanding | 58,461 | 57,975
Sasol Gabon S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Crude oil and natural gas sales | $ 57,547 | $ 34,820
Operating income (loss) | 25,025 | (21,501)
Net income (loss) | $ 11,736 | $ (47,155)
Income (loss) from continuing operations | $ 0.20 | $ (0.81)
Loss from discontinued operations, net of tax | 0.00 | 0.00
Net income (loss) per share | $ 0.20 | $ (0.81)
Basic weighted average shares outstanding | 57,636 | 57,975
Income (loss) from continuing operations | $ 0.20 | $ (0.81)
Loss from discontinued operations, net of tax | 0.00 | 0.00
Net income (loss) per share | $ 0.20 | $ (0.81)
Diluted weighted average shares outstanding | 58,461 | 57,975
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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