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Foreign exchange and derivative financial instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities, beginning balance $ (3,126) $ (13,575) $ (16,877)
Credit Support Payments/(Receipts), beginning balance 4,328 15,757 16,390
Net exposure, liabilities, beginning balance     (487)
Net exposure, assets, beginning balance 1,202 2,182  
Derivative financial instrument (loss)/gain, net (22,441) 10,967 (18,534)
Gain/(Loss) on derivative financial instruments through OCI (110) (4,387) 4,267
Gain/(Loss) on derivative financial instruments through finance costs 71 (186) 3,461
Settlement of derivative financial instruments 16,883 4,055 14,108
Credit support receipts on derivative financial instruments, net (243) (11,429) (633)
Derivative financial liabilities, ending balance (8,723) (3,126) (13,575)
Credit Support Payments/(Receipts), ending balance 4,085 4,328 15,757
Net exposure, liabilities, ending balance (4,638)    
Net exposure, assets, ending balance   1,202 2,182
Cross Currency Interest Rate Swaps Economic Hedge      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities, beginning balance (10,512) (18,196) (11,922)
Derivative financial instrument (loss)/gain, net (13,766) 7,684 (6,274)
Gain/(Loss) on derivative financial instruments through OCI 0 0 0
Gain/(Loss) on derivative financial instruments through finance costs 0 0 0
Settlement of derivative financial instruments 15,860 0 0
Derivative financial liabilities, ending balance (8,418) (10,512) (18,196)
Interest Rate Swaps      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities, beginning balance     0
Derivative financial assets, beginning balance 2,072 3,711  
Derivative financial instrument (loss)/gain, net 0 0 0
Gain/(Loss) on derivative financial instruments through OCI 0 0 0
Gain/(Loss) on derivative financial instruments through finance costs 71 (186) 3,461
Settlement of derivative financial instruments (1,434) (1,453) 250
Derivative financial assets, ending balance 709 2,072 3,711
Foreign Exchange Forwards Economic Hedge      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities, beginning balance     (3,727)
Derivative financial assets, beginning balance 5,304 3,840  
Derivative financial instrument (loss)/gain, net (8,675) 3,283 (12,260)
Gain/(Loss) on derivative financial instruments through OCI 0 0 0
Gain/(Loss) on derivative financial instruments through finance costs 0 0 0
Settlement of derivative financial instruments 2,357 (1,819) 19,827
Derivative financial liabilities, ending balance (1,014)    
Derivative financial assets, ending balance   5,304 3,840
Natural Gas Futures Cash Flow Hedge      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities, beginning balance   (2,930) (1,228)
Derivative financial assets, beginning balance 10    
Derivative financial instrument (loss)/gain, net 0 0 0
Gain/(Loss) on derivative financial instruments through OCI (110) (4,387) 4,267
Gain/(Loss) on derivative financial instruments through finance costs 0 0 0
Settlement of derivative financial instruments 100 7,327 (5,969)
Derivative financial liabilities, ending balance     $ (2,930)
Derivative financial assets, ending balance $ 0 $ 10