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Intangible assets and goodwill (Details 1) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | $ 188,283 | $ 113,787 | $ 109,439 |
Total intangible assets and goodwill | 223,001 | 151,759 | 147,411 | $ 148,816
Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 216,863 | 134,617 |  |
Total intangible assets and goodwill | 254,835 | 172,589 | 164,668 | 167,059
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | (26,639) | (20,830) |  |
Total intangible assets and goodwill | (26,639) | (20,830) |  |
Accumulated impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | (1,941) |  |  |
Total intangible assets and goodwill | $ (5,195) |  |  |
Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill |  | $ 113,787 |  |
Computer software [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Finite | Finite |  |
Intangible assets other than goodwill | $ 3,378 | $ 5,291 |  |
Total intangible assets and goodwill | 3,378 | 5,291 | 7,046 | 9,813
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 28,833 | 25,060 |  |
Total intangible assets and goodwill | 1,254 | 25,060 | 23,280 | 23,251
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 | (25,455) | $ (19,769) |  |
Computer software [member] | Accumulated impairment [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | $ 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 | $ 151 | $ 189 |  |
Total intangible assets and goodwill |  | 189 | 460 | 464
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 | 1,254 | 1,250 |  |
Total intangible assets and goodwill | 184,849 | 1,250 | 1,483 | 1,448
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 | (1,096) | (1,061) |  |
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) |  |  |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill | $ 151 | $ 189 | 98,596 | 96,500
Goodwill [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life |  | Indefinite |  |
Intangible assets other than goodwill |  | $ 37,972 |  |
Goodwill [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill |  | 37,972 |  |
Goodwill [Member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill |  | 0 |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Indefinite |  |  |
Intangible assets other than goodwill | $ 34,718 | 37,972 |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 37,972 |  |  |
Goodwill [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 |  |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | (3,254) |  |  |
Mining Property Water Rights And Rights Of Way [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill | $ 183,032 | 106,358 |  |
Mining Property Water Rights And Rights Of Way [Member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill |  | 106,358 | 106,436 |
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 |  | $ 106,358 | 106,436 |
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 | $ 183,032 | $ 106,358 |  |
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 | 184,849 | 106,358 |  |
Total intangible assets and goodwill |  |  | 98,596 | 96,500
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 | (88) | $ 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 | $ (1,729) |  |  |
Customer-related intangible assets [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill |  |  | 2,942 |
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Indefinite | Indefinite |  |
Intangible assets other than goodwill | $ 1,573 | $ 1,778 |  |
Total intangible assets and goodwill | 1,573 | 1,778 |  |
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [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 | 2,942 | 3,651
Customer-related intangible assets [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 |  |
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | $ (205) |  |  |
Other Intangible Assets [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill |  | 1,778 |  |
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 |  | $ 171 |  |
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Indefinite | Indefinite |  |
Intangible assets other than goodwill | $ 149 | $ 171 |  |
Total intangible assets and goodwill | 149 | 171 | 3,337 | $ 3,651
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 149 | 171 |  |
Total intangible assets and goodwill | 149 | 171 | $ 0 |
Other Intangible Assets [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 |  |
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | $ 0 |  |  |

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