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Intangible assets and goodwill - Useful Life and Net Value of Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 166,336 $ 179,658 $ 178,407
Goodwill 967 34,596 41,966
Total intangible assets and goodwill $ 167,303 $ 214,254 214,254
IT programs | Finite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 3,249 $ 3,447  
Total intangible assets and goodwill $ 3,249 $ 3,447 3,447
Mining rights | Finite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 140,873 $ 149,532  
Total intangible assets and goodwill $ 140,873 $ 149,532 149,532
Water rights and rights of way | Indeifinite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Indefinite Indefinite  
Intangible assets other than goodwill $ 4,909 $ 4,909  
Total intangible assets and goodwill $ 4,909 $ 4,909 4,909
Water rights | Finite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 11,369 $ 15,158  
Total intangible assets and goodwill 11,369 15,158 15,158
Customer-related intangible assets | Finite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Total intangible assets and goodwill $ 0 $ 0  
Intellectual property | Finite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 5,850 $ 6,481  
Total intangible assets and goodwill $ 5,850 $ 6,481 6,481
Other intangible assets | Finite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 86 $ 131  
Total intangible assets and goodwill 86 131 $ 131
Goodwill      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Goodwill $ 967 $ 34,596  
Goodwill | Indeifinite intangible assets      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Indefinite