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Leases and right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance $ 49,853 $ 44,396
Additions 2,807 8,328
Disposals (178) (2,871)
Transfers and other movements (17,585)  
Ending balance 34,897 49,853
Right-of-use assets, net carrying amount 21,843 30,073
Accumulated depreciation    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance (19,780) (12,577)
Disposals 155 818
Transfers and other movements 12,090  
Depreciation for the year (5,519) (8,021)
Ending balance (13,054) (19,780)
Right-of-use Land and buildings    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance 14,616 14,555
Additions 0 815
Disposals 0 (754)
Transfers and other movements 64  
Ending balance 14,680 14,616
Right-of-use assets, net carrying amount 10,288 11,225
Right-of-use Land and buildings | Accumulated depreciation    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance (3,391) (2,303)
Disposals 0 438
Transfers and other movements 320  
Depreciation for the year (1,321) (1,526)
Ending balance (4,392) (3,391)
Right-of-use Plant and equipment    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance 35,237 29,841
Additions 2,807 7,513
Disposals (178) (2,117)
Transfers and other movements (17,649)  
Ending balance 20,217 35,237
Right-of-use assets, net carrying amount 11,555 18,848
Right-of-use Plant and equipment | Accumulated depreciation    
Right-of-Use Assets Costs and Accumulated Depreciation    
Beginning balance (16,389) (10,274)
Disposals 155 380
Transfers and other movements 11,770  
Depreciation for the year (4,198) (6,495)
Ending balance $ (8,662) $ (16,389)