Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.20.1
Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Oct. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
$ / d
item
Dec. 31, 2019
USD ($)
Jul. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Commitments And Contingencies [Line Items]          
Abandonment funding   $ 11,227 $ 11,371   $ 11,390
Number of drilled wells required by agreement | item   2      
Number of appraisal wells required by agreement | item   2      
Day rate of drilling rig contract | $ / d   75,000      
Potential Fees From Customs Audits [Member]          
Commitments And Contingencies [Line Items]          
Loss contingency   $ 3,700      
Etame Marine Block [Member]          
Commitments And Contingencies [Line Items]          
Estimated abandonment costs   19,200      
Abandonment funding   11,200      
Loss contingency   $ 4,400   $ 4,400  
Payment of joint venture audit settlement $ 1,100        
FPSO Charter [Member]          
Commitments And Contingencies [Line Items]          
Number of extensions | item   2      
Period of charter   1 year      
Guarantee liability   $ 300 $ 400    
Percentage of share in charter payment   31.10%      
Share in charter payment, approximate annual amount   $ 9,700      
Full Charter Payment [Member]          
Commitments And Contingencies [Line Items]          
Contractual obligation   47,500      
Contractual obligation   47,500      
Consortium [Member] | Etame Marine Block [Member]          
Commitments And Contingencies [Line Items]          
Estimated abandonment costs   61,800      
Abandonment funding   36,100      
Consortium [Member] | FPSO Charter [Member]          
Commitments And Contingencies [Line Items]          
Maximum exposure   $ 47,500