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Leases and right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Right-of-Use Assets Costs and Accumulated Depreciation    
Right-of-use assets, net carrying amount at December 31, 2022 $ 21,843  
Right-of-use assets, net carrying amount at December 31, 2023 22,613 $ 21,843
Cost    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance 34,897 49,853
Additions 3,733 2,807
Disposals (271) (178)
Transfers and other movements 384 (17,585)
Ending balance 38,743 34,897
Accumulated depreciation    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance (13,054) (19,780)
Disposals 174 155
Transfers and other movements 854 12,090
Depreciation for the year (4,104) (5,519)
Ending balance (16,130) (13,054)
Right-of-use Land and buildings    
Right-of-Use Assets Costs and Accumulated Depreciation    
Right-of-use assets, net carrying amount at December 31, 2022 10,288  
Right-of-use assets, net carrying amount at December 31, 2023 10,086 10,288
Right-of-use Land and buildings | Cost    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance 14,680 14,616
Additions 479 0
Disposals (170) 0
Transfers and other movements 977 64
Ending balance 15,966 14,680
Right-of-use Land and buildings | Accumulated depreciation    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance (4,392) (3,391)
Disposals 131 0
Transfers and other movements (90) 320
Depreciation for the year (1,529) (1,321)
Ending balance (5,880) (4,392)
Right-of-use Plant and equipment    
Right-of-Use Assets Costs and Accumulated Depreciation    
Right-of-use assets, net carrying amount at December 31, 2022 11,555  
Right-of-use assets, net carrying amount at December 31, 2023 12,527 11,555
Right-of-use Plant and equipment | Cost    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance 20,217 35,237
Additions 3,254 2,807
Disposals (101) (178)
Transfers and other movements (593) (17,649)
Ending balance 22,777 20,217
Right-of-use Plant and equipment | Accumulated depreciation    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance (8,662) (16,389)
Disposals 43 155
Transfers and other movements 944 11,770
Depreciation for the year (2,575) (4,198)
Ending balance $ (10,250) $ (8,662)