Annual report pursuant to Section 13 and 15(d)

Acquisitions and Dispositions (Pro Forma Results of Acquisition) (Details)

v3.22.0.1
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