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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Basic weighted average shares outstanding | 58,586 |  | 57,456 | 58,102 |  | 57,628
Diluted weighted average shares outstanding | 58,916 |  | 57,741 | 58,654 |  | 57,628
Sasol Gabon S.A. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Crude oil and natural gas sales | $ 55,899 |  | $ 34,568 | $ 160,469 |  | $ 103,422
Operating income (loss) | 20,030 |  | 7,750 | 63,929 |  | (12,481)
Net income (loss) | $ 31,721 | [1] | $ 9,136 | $ 49,341 | [1] | $ (36,316)
Income (loss) from continuing operations | $ 0.53 |  | $ 0.16 | $ 0.85 |  | $ (0.63)
Loss from discontinued operations, net of tax | 0.00 |  | 0.00 | 0.00 |  | 0.00
Net income (loss) per share | $ 0.53 |  | $ 0.16 | $ 0.85 |  | $ (0.63)
Basic weighted average shares outstanding | 58,586 |  | 57,456 | 58,102 |  | 57,628
Income (loss) from continuing operations | $ 0.53 |  | $ 0.16 | $ 0.84 |  | $ (0.63)
Loss from discontinued operations, net of tax | 0.00 |  | 0.00 | 0.00 |  | 0.00
Net income (loss) per share | $ 0.53 |  | $ 0.16 | $ 0.84 |  | $ (0.63)
Diluted weighted average shares outstanding | 58,916 |  | 57,741 | 58,654 |  | 57,628
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)
[1] | The pro forma net income for the nine months ended September 30, 2021 excludes nonrecurring pro forma adjustments directly attributable to the Sasol Acquisition, consisting of a bargain purchase gain of $7.7 million and transaction costs of $1.0 million.

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