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Intangible assets and goodwill (Details 1) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 188,358 | $ 189,350 |
Goodwill | 34,726 | 34,866 | $ 37,972
Total intangible assets and goodwill | $ 223,084 | $ 224,216 | 151,759
Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 1,294 | $ 1,412 |
Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 222,197 | 217,929 |
Goodwill | 38,120 | 38,120 | 37,972
Total intangible assets and goodwill | 260,317 | 256,049 | 172,589
Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 1,500 | 1,500 |
Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (31,190) | (26,843) |
Total intangible assets and goodwill | (31,190) | (26,843) |
Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (206) | (88) |
Accumulated impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (2,649) | (1,736) |
Goodwill | (3,394) | (3,254) | 0
Total intangible assets and goodwill | (6,043) | (4,990) |
Accumulated impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 0 | $ 0 |
Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life |  | Indefinite |
Intangible assets other than goodwill |  | $ 34,866 |
Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill |  | 38,120 |
Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill |  | 0 |
Indeifinite Intangible assets [Member] | Accumulated impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill |  | $ (3,254) |
Computer software [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 6,011 | $ 4,568 |
Total intangible assets and goodwill | 6,011 | 4,568 | 5,291
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 34,471 | 29,137 |
Total intangible assets and goodwill | 34,471 | 29,137 | 25,060
Computer software [member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (28,460) | (24,569) |
Computer software [member] | Accumulated impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 0 | $ 0 |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Finite | Finite |
Intangible assets other than goodwill | $ 121 | $ 151 |
Total intangible assets and goodwill | 121 | 151 | 189
Copyrights, patents and other industrial property rights, service and operating rights [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 1,259 | 1,254 |
Total intangible assets and goodwill | 1,259 | 1,254 | 1,250
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (1,131) | (1,096) |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (7) | (7) |
Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | 34,726 |  |
Goodwill [Member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | 38,120 |  |
Goodwill [Member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | 0 |  |
Goodwill [Member] | Accumulated impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ (3,394) |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Useful life | Indefinite |  |
Mining Property Water Rights And Rights Of Way [Member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Total intangible assets and goodwill | $ 182,260 | $ 183,349 |
Mining Property 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 | $ 179,618 | $ 181,620 |
Total intangible assets and goodwill | 179,618 | 181,620 | 104,858
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 182,260 | 183,349 |
Total intangible assets and goodwill |  | 183,349 | 104,858
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 0 | 0 |
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ (2,642) | $ (1,729) |
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 | $ 1,273 | $ 1,573 |
Total intangible assets and goodwill | 1,273 | 1,573 | 1,778
Customer-related intangible assets [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 1,778 | 1,778 |
Total intangible assets and goodwill | 1,778 | 1,778 | 1,778
Customer-related intangible assets [member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (505) | (205) |
Customer-related intangible assets [member] | Accumulated impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 0 | $ 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 | $ 41 | $ 26 |
Total intangible assets and goodwill | 41 | 26 | 171
Other Intangible Assets [Member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 929 | 911 |
Total intangible assets and goodwill | 929 | 911 | $ 171
Other Intangible Assets [Member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | (888) | (885) |
Other Intangible Assets [Member] | Accumulated impairment [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 0 | $ 0 |

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