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Financial instruments - Bank Borrowings, Current (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 21, 2022
Financial instruments [Line Items]      
Notional amounts $ 345,949 $ 43,396  
Borrowing costs (2,360) (2,802)  
Bank borrowings      
Financial instruments [Line Items]      
Notional amounts 130,000 0  
Current amounts 130,989 85  
Borrowing costs (149) 0  
Total 130,840 85  
Bank borrowings | Not later than three months      
Financial instruments [Line Items]      
Notional amounts 60,000 0  
Current amounts 60,596 85  
Bank borrowings | Later than three months and not later than one year      
Financial instruments [Line Items]      
Notional amounts 70,000 0  
Current amounts $ 70,393 $ 0  
Scotiabank Cayman      
Financial instruments [Line Items]      
Effective rate 2.33% 2.05%  
Nominal rate 3.19% 1.36%  
Scotiabank Cayman | Bank borrowings      
Financial instruments [Line Items]      
Effective rate 0.97% 0.82%  
Nominal rate 5.22% 1.36%  
Notional amounts $ 70,000 $ 0  
Current amounts 70,393 85  
Borrowing costs (149) 0  
Total 70,244 85  
Scotiabank Cayman | Bank borrowings | Not later than three months      
Financial instruments [Line Items]      
Notional amounts 0 0  
Current amounts   85  
Scotiabank Cayman | Bank borrowings | Later than three months and not later than one year      
Financial instruments [Line Items]      
Notional amounts 70,000 0  
Current amounts $ 70,393 $ 0  
Banco Ita CorpBanca | Bank borrowings      
Financial instruments [Line Items]      
Effective rate 4.50%    
Nominal rate 4.50%    
Notional amounts $ 20,000    
Current amounts 20,062    
Borrowing costs 0    
Total 20,062    
Banco Ita CorpBanca | Bank borrowings | Not later than three months      
Financial instruments [Line Items]      
Notional amounts 20,000    
Current amounts 20,062    
Banco Ita CorpBanca | Bank borrowings | Later than three months and not later than one year      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts $ 0    
Banco Estado | Bank borrowings      
Financial instruments [Line Items]      
Effective rate 4.59%    
Nominal rate 4.59%    
Notional amounts $ 40,000    
Current amounts 40,128    
Borrowing costs 0    
Total 40,128    
Banco Estado | Bank borrowings | Not later than three months      
Financial instruments [Line Items]      
Notional amounts 40,000    
Current amounts 40,128    
Banco Estado | Bank borrowings | Later than three months and not later than one year      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts $ 0    
Scotiabank Sud Americano      
Financial instruments [Line Items]      
Effective rate 5.10%    
Nominal rate 6.08%    
Scotiabank Sud Americano | Bank borrowings      
Financial instruments [Line Items]      
Notional amounts $ 0    
Current amounts 406    
Borrowing costs 0    
Total 406    
Scotiabank Sud Americano | Bank borrowings | Not later than three months      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts 406    
Scotiabank Sud Americano | Bank borrowings | Later than three months and not later than one year      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts 0    
Banco Santander      
Financial instruments [Line Items]      
Current amounts $ 0    
Banco Santander | Minimum      
Financial instruments [Line Items]      
Notional amounts     $ 10,000
Banco Santander | Maximum      
Financial instruments [Line Items]      
Notional amounts     $ 100,000