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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets $ 53,903 $ 48,191
Deferred tax liabilities 152,115 142,568
Net deferred tax liabilities 98,212 94,377
Provisions and accrued expenses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 20,941 21,138
Lease liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 18,114 17,352
Accounts receivable valuation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 2,297 2,814
Inventory valuation and costing    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 2,457 1,781
Retirement benefit obligations    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 1,344 1,142
Unrealized loss on derivative instruments    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 2,312 828
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total deferred tax assets 6,438 3,136
Deferred tax liabilities 7,267 9,935
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 58,005 47,677
Goodwill    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 45,920 45,920
Mineral deposits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 19,498 19,492
Right-of-use assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 18,114 16,282
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities $ 3,311 $ 3,262