Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.19.3
Commitments and Contingencies (Narrative) (Details)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
$ / bbl
$ / d
item
bbl
Dec. 31, 2018
USD ($)
Jul. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 26, 2018
USD ($)
Sep. 17, 2018
USD ($)
Commitments And Contingencies [Line Items]                
Abandonment Funding     $ 11,112 $ 11,571        
Accrued liabilities and other     $ 23,886 14,138        
Charter fee for production up to 20,000 BOPD | $ / bbl     0.93          
Charter fee amount threshold | bbl     20,000          
Charter fee for those bbls produced in excess of 20,000 BOPD | $ / bbl     2.50          
Company's share of charter expense       10,800        
Number of drilled wells required by agreement | item     2          
Number of appraisal wells required by agreement | item     2          
Estimated costs of wells, gross amount     $ 68,500          
Estimated costs of wells     23,000          
Estimated costs of technical studies, net     400          
Abandonment cost related to annual funding     61,800          
Abandonment cost related to annual funding, net     $ 19,200          
Payment of other taxes   $ 1,300            
Day rate of drilling rig contract | $ / d     75,000          
Potential Fees From Customs Audits [Member]                
Commitments And Contingencies [Line Items]                
Accrued liabilities and other       1,300        
Gabon                
Commitments And Contingencies [Line Items]                
Abandonment Funding     $ 11,100          
Contractual obligation               $ 21,800
Accrued liabilities, end of drilling activities, gross amount             $ 5,000  
Accrued liabilities, end of drilling activities           $ 1,700    
Abandonment funding, gross     35,700          
Loss contingency     $ 4,400   $ 4,400      
Gabon | Subsequent Event                
Commitments And Contingencies [Line Items]                
Payment of joint venture audit settlement $ 1,100              
Offshore Gabon                
Commitments And Contingencies [Line Items]                
Production License Agreement Term Extended By Government     5 years          
Percentage of annual funding over seven years     12.14%          
Funding period for initial rate     7 years          
Second funding period of production license     3 years          
Percentage of annual funding over last three years     5.00%          
Funding period abandonment funding     10 years          
Number of contract extension periods | item     2          
Full Charter Payment [Member]                
Commitments And Contingencies [Line Items]                
Contractual obligation     $ 53,900 53,928        
FPSO Charter [Member]                
Commitments And Contingencies [Line Items]                
Number of extensions | item     2          
Period of charter (in years)     1 year          
Percentage of share in charter payment     31.10%          
Share in charter payment, approximate annual amount     $ 9,700          
Liabilities, guarantees' fair value     $ 200 $ 200