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Intangible assets and goodwill - Useful Life and Net Value of Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 167,968 $ 155,874 $ 166,336
Goodwill 948 958 967
Total intangible assets and goodwill 168,916 156,832 167,303
IT programs | Intangible assets other than goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 8,430 3,190  
Total intangible assets and goodwill 8,430 3,190 3,249
Mining rights | Intangible assets other than goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 133,119 134,924  
Total intangible assets and goodwill 133,119 134,924 140,873
Water rights and rights of way | Indefinite      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 4,909 4,909  
Total intangible assets and goodwill 4,909 4,909 4,909
Water rights | Intangible assets other than goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 3,791 7,580  
Total intangible assets and goodwill 3,791 7,580 11,369
Intellectual property | Intangible assets other than goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 14,761 5,201  
Total intangible assets and goodwill 14,761 5,201 5,850
Other intangible assets | Intangible assets other than goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 2,958 70  
Total intangible assets and goodwill 2,958 70 $ 86
Goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Goodwill $ 948 $ 958