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Financial instruments - Bank Borrowings, Non-Current (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financial instruments [Line Items]    
Notional amount $ 313,107 $ 50,707
Bond issuance costs (5,336) (3,708)
Unsecured obligations    
Financial instruments [Line Items]    
Notional amount 136,000 300,000
Carrying amount 136,000 300,000
Bond issuance costs (6,317) (4,482)
Total 129,683 295,518
Unsecured obligations | Over 1 year to 2 years    
Financial instruments [Line Items]    
Notional amount 0 0
Carrying amount 0 0
Unsecured obligations | Over 2 years to 3 years    
Financial instruments [Line Items]    
Notional amount 0 200,000
Carrying amount 0 200,000
Unsecured obligations | Over 3 years to 4 years    
Financial instruments [Line Items]    
Notional amount 136,000 100,000
Carrying amount $ 136,000 $ 100,000
Banco Santander/Kexim    
Financial instruments [Line Items]    
Effective rate 4.73% 5.49%
Nominal rate 4.28% 6.36%
Banco Santander/Kexim | Unsecured obligations    
Financial instruments [Line Items]    
Notional amount $ 100,000 $ 100,000
Carrying amount 100,000 100,000
Bond issuance costs (2,997) (2,834)
Total 97,003 97,166
Banco Santander/Kexim | Unsecured obligations | Over 1 year to 2 years    
Financial instruments [Line Items]    
Notional amount 0 0
Carrying amount 0 0
Banco Santander/Kexim | Unsecured obligations | Over 2 years to 3 years    
Financial instruments [Line Items]    
Notional amount 0 0
Carrying amount 0 0
Banco Santander/Kexim | Unsecured obligations | Over 3 years to 4 years    
Financial instruments [Line Items]    
Notional amount 100,000 100,000
Carrying amount $ 100,000 $ 100,000
Banco Santander Kexim 2    
Financial instruments [Line Items]    
Effective rate 4.27%  
Nominal rate 4.29%  
Banco Santander Kexim 2 | Unsecured obligations    
Financial instruments [Line Items]    
Notional amount $ 36,000  
Carrying amount 36,000  
Bond issuance costs (3,320)  
Total 32,680  
Banco Santander Kexim 2 | Unsecured obligations | Over 1 year to 2 years    
Financial instruments [Line Items]    
Notional amount 0  
Carrying amount 0  
Banco Santander Kexim 2 | Unsecured obligations | Over 2 years to 3 years    
Financial instruments [Line Items]    
Notional amount 0  
Carrying amount 0  
Banco Santander Kexim 2 | Unsecured obligations | Over 3 years to 4 years    
Financial instruments [Line Items]    
Notional amount 36,000  
Carrying amount $ 36,000  
Bank of Nova Scotia    
Financial instruments [Line Items]    
Effective rate   5.88%
Nominal rate   6.64%
Bank of Nova Scotia | Unsecured obligations    
Financial instruments [Line Items]    
Notional amount   $ 200,000
Carrying amount   200,000
Bond issuance costs   (1,648)
Total   198,352
Bank of Nova Scotia | Unsecured obligations | Over 1 year to 2 years    
Financial instruments [Line Items]    
Notional amount   0
Carrying amount   0
Bank of Nova Scotia | Unsecured obligations | Over 2 years to 3 years    
Financial instruments [Line Items]    
Notional amount   200,000
Carrying amount   200,000
Bank of Nova Scotia | Unsecured obligations | Over 3 years to 4 years    
Financial instruments [Line Items]    
Notional amount   0
Carrying amount   $ 0