Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Apr. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
item
$ / Boe
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
USD ($)
Sep. 25, 2018
USD ($)
Jun. 30, 2016
USD ($)
Commitments And Contingencies [Line Items]                    
Abandonment Funding         $ 11,571 $ 10,808   $ 10,808    
Percentage of share in charter payment         31.10%          
Share in charter payment, approximate annual amount         $ 9,700          
Liabilities, guarantees' fair value         $ 300 500        
Contractual obligation                   $ 5,100
Charter fee for production up to 20,000 BOPD | $ / Boe         0.93          
Charter fee for those bbls produced in excess of 20,000 BOPD | $ / Boe         2.50          
Company's share of charter expense         $ 10,800 12,800 $ 11,200      
Rent expense, operating leases         $ 1,300 2,400 4,500      
Number of drilled wells required by agreement | item         2          
Number of appraisal wells required by agreement | item         2          
Estimated costs of wells, gross amount         $ 61,200          
Estimated costs of wells         20,500          
Estimated costs of technical studies         1,300          
Estimated costs of technical studies, net         400          
Accrued estimated settlement           500        
Subsequent Event                    
Commitments And Contingencies [Line Items]                    
Payment of payroll taxes $ 1,300                  
Gabon                    
Commitments And Contingencies [Line Items]                    
Discount     25.00% 15.00%            
Contractual obligation       $ 1,700 1,100 $ 1,200 1,700   $ 21,800  
Accrued liabilities, end of drilling activities, gross amount         5,000          
Accrued liabilities, end of drilling activities         $ 1,700          
Number of technical studies required | item         2          
Additional percent of revenue for provisions   1.00%                
Percent of investment cost which are cost recoverable           75.00%        
Accrued Payroll Taxes       $ 1,000 $ 1,300   $ 1,000      
Gabon | Gabon DMO [Member]                    
Commitments And Contingencies [Line Items]                    
Contractual obligation         1,200 $ 1,300        
Gabon | PID And PIH [Member]                    
Commitments And Contingencies [Line Items]                    
Contractual obligation         1,900 $ 1,400        
Full Charter Payment [Member]                    
Commitments And Contingencies [Line Items]                    
Contractual obligation         53,928          
Abandonment cost related to annual funding         61,800          
Full Charter Payment [Member] | Offshore Gabon                    
Commitments And Contingencies [Line Items]                    
Abandonment funding         37,400          
VAALCO ENERGY, INC.                    
Commitments And Contingencies [Line Items]                    
Contractual obligation         16,747          
VAALCO ENERGY, INC. | Offshore Gabon                    
Commitments And Contingencies [Line Items]                    
Abandonment funding         11,600          
VAALCO ENERGY, INC. | Full Charter Payment [Member]                    
Commitments And Contingencies [Line Items]                    
Abandonment cost related to annual funding         $ 19,200