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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Basic weighted average shares outstanding | 58,072 |  | 57,456 |  | 57,855 |  | 57,716 |
Diluted weighted average shares outstanding | 58,574 |  | 57,594 |  | 58,527 |  | 57,716 |
Sasol Gabon S.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Crude oil and natural gas sales | $ 47,023 |  | $ 34,034 |  | $ 104,570 |  | $ 68,854 |
Operating income (loss) | 18,874 |  | 1,270 |  | 43,899 |  | (20,231) |
Net income (loss) | $ 5,884 | [1] | $ 1,703 | [2] | $ 17,620 | [1] | $ (45,452) | [2]
Income (loss) from continuing operations | $ 0.10 |  | $ 0.03 |  | $ 0.30 |  | $ (0.79) |
Loss from discontinued operations, net of tax | 0.00 |  | 0.00 |  | 0.00 |  | 0.00 |
Net income (loss) per share | $ 0.10 |  | $ 0.03 |  | $ 0.30 |  | $ (0.79) |
Basic weighted average shares outstanding | 58,072 |  | 57,456 |  | 57,855 |  | 57,716 |
Income (loss) from continuing operations | $ 0.10 |  | $ 0.03 |  | $ 0.30 |  | $ (0.79) |
Loss from discontinued operations, net of tax | 0.00 |  | 0.00 |  | 0.00 |  | 0.00 |
Net income (loss) per share | $ 0.10 |  | $ 0.03 |  | $ 0.30 |  | $ (0.79) |
Diluted weighted average shares outstanding | 58,574 |  | 57,594 |  | 58,527 |  | 57,716 |
Sasol Gabon S.A. [Member] | Bargain Purchase Gain [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Net income (loss) | $ (7,700) |  | $ (7,700) |  | $ (7,700) |  | $ (7,700) |
Sasol Gabon S.A. [Member] | Acquisition-related Costs [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Net income (loss) | $ (1,000) |  | $ (1,000) |  | $ (1,000) |  | $ (1,000) |
[1] | The pro forma net income for the six months ended June 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.
[2] | The pro forma net loss for the six months ended June 30, 2020 includes 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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