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Intangible assets and goodwill (Details 1) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 178,407 | $ 188,358 | $ 189,350
Goodwill | 41,966 | 34,726 | 34,866
Total intangible assets and goodwill | $ 220,373 | $ 223,084 | 224,216
Computer software [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 4,826 | $ 6,011 |
Total intangible assets and goodwill | 4,826 | 6,011 | 4,568
Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ 41,966 | $ 34,726 |
Goodwill [Member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Indefinite | Indefinite |
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 | $ 150,046 | $ 157,570 |
Total intangible assets and goodwill | $ 150,046 | $ 157,570 | 159,256
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 | $ 23,343 | $ 23,342 |
Total intangible assets and goodwill | $ 23,343 | $ 23,342 | 23,776
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 | $ 1,273 |
Total intangible assets and goodwill | $ 0 | $ 1,273 | 1,573
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 | $ 192 | $ 162 |
Total intangible assets and goodwill | $ 192 | $ 162 | $ 177

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