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Intangible assets and goodwill (Details 1) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 179,658 | $ 178,407 | $ 188,358
Goodwill | 34,596 | 41,966 | 34,726
Total intangible assets and goodwill | $ 214,254 | $ 220,373 | 223,084
Computer software [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 3,447 | $ 4,826 |
Total intangible assets and goodwill | $ 3,447 | $ 4,826 | 6,011
Mining rights [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Unit-production method |  |
Mining rights [Member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 149,532 | $ 150,046 |
Total intangible assets and goodwill | $ 149,532 | $ 150,046 | 157,570
Water rights and rights of way [member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Indefinite | Indefinite |
Intangible assets other than goodwill | $ 4,909 | $ 5,343 |
Total intangible assets and goodwill | $ 4,909 | $ 5,343 |
Water rights | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 15,158 | $ 18,000 |
Total intangible assets and goodwill | $ 15,158 | $ 18,000 |
Customer-related intangible assets [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 0 | $ 0 |
Total intangible assets and goodwill | $ 0 | 0 | 1,273
Intellectual property [Member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite |  |
Intangible assets other than goodwill | $ 6,481 |  |
Total intangible assets and goodwill | $ 6,481 | $ 0 |
Other Intangible Assets [Member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 131 | $ 192 |
Total intangible assets and goodwill | 131 | 192 | $ 162
Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ 34,596 | $ 41,966 |
Goodwill [Member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Indefinite | Indefinite |

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