Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
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)