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Leases and right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cost    
Beginning balance $ 44,396 $ 34,507
Additions 8,328 11,294
Disposals (2,871) (1,405)
Ending balance 49,853 44,396
Accumulated depreciation    
Beginning balance (12,577) (5,738)
Depreciation for the year (8,021) (7,126)
Disposals 818 287
Ending balance (19,780) (12,577)
Right-of-use assets, net carrying amount 30,073 31,819
Right-of-use Land and buildings    
Cost    
Beginning balance 14,555 8,107
Additions 815 6,922
Disposals (754) (474)
Ending balance 14,616 14,555
Accumulated depreciation    
Beginning balance (2,303) (1,184)
Depreciation for the year (1,526) (1,200)
Disposals 438 81
Ending balance (3,391) (2,303)
Right-of-use assets, net carrying amount 11,225 12,252
Plant and equipment    
Cost    
Beginning balance 29,841 26,400
Additions 7,513 4,372
Disposals (2,117) (931)
Ending balance 35,237 29,841
Accumulated depreciation    
Beginning balance (10,274) (4,554)
Depreciation for the year (6,495) (5,926)
Disposals 380 206
Ending balance (16,389) (10,274)
Right-of-use assets, net carrying amount $ 18,848 $ 19,567