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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 |  |

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