Annual report pursuant to Section 13 and 15(d)

Acquisitions and Dispositions (Narrative) (Details)

v3.22.0.1
Acquisitions and Dispositions (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 29, 2021
USD ($)
Feb. 25, 2021
USD ($)
$ / bbl
Nov. 30, 2006
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Feb. 24, 2021
Business Acquisition [Line Items]              
Bargain purchase gain       $ (7,651)      
Revenues       199,075 $ 67,176 $ 84,521  
Net income       81,836 $ (48,181) $ 2,563  
Sasol Gabon S.A. [Member]              
Business Acquisition [Line Items]              
Bargain purchase gain   $ (7,700)          
Bargain purchase gain, net of tax   5,200          
Bargain purchase gain, income tax benefit   4,100          
Revenues       84,600      
Net income       $ 29,300      
Contingent consideration   $ 5,000          
Contingent consideration, measurement period of oil price   90 days          
Contingent consideration, oil price threshold | $ / bbl   60.00          
Contingent consideration paid $ 5,000            
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member]              
Business Acquisition [Line Items]              
Joint operation agreement related to third party in working interest percentage     40.00%        
Additional joint operation agreement related to third party in working interest percentage     10.00%        
Etame Marine Block [Member] | Sasol Gabon S.A. [Member]              
Business Acquisition [Line Items]              
Increase (decrease) in working interest ownership percentage   27.80%          
Working interest ownership, percentage   58.80%         31.10%