Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Dispositions (Narrative) (Details)

v3.21.1
Acquisitions and Dispositions (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 25, 2021
USD ($)
Nov. 30, 2006
Mar. 31, 2021
USD ($)
$ / bbl
Mar. 31, 2020
USD ($)
Feb. 24, 2021
Business Acquisition [Line Items]          
Bargain purchase gain     $ (7,651)    
Revenues     39,774 $ 18,389  
Net income     9,869 (52,800)  
Contingent consideration     5,000    
Sasol Gabon S.A. [Member]          
Business Acquisition [Line Items]          
Bargain purchase gain $ (7,700)   (7,700)    
Bargain purchase gain, net of tax 5,500   5,500    
Bargain purchase gain, income tax benefit 2,200     $ 2,200  
Revenues     9,400    
Net income     1,200    
Contingent consideration $ 5,000   $ 5,000    
Contingent consideration, measurement period of oil price     90 days    
Contingent consideration, oil price threshold | $ / bbl     60.00    
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]          
Business Acquisition [Line Items]          
Working interest ownership, percentage 58.80%       31.10%
Etame Marine Block [Member] | Sasol Gabon S.A. [Member]          
Business Acquisition [Line Items]          
Increase (decrease) in working interest ownership percentage 27.80%