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Intangible assets and goodwill (Details 1) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life |  | Useful life |  |
Intangible assets other than goodwill | $ 105,948 | $ 109,439 | $ 110,428 |
Goodwill | 44,177 | 37,972 | 38,388 |
Total intangible assets and goodwill | 150,125 | 147,411 | 148,816 |
Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 126,778 | 126,696 |  |
Total intangible assets and goodwill | 170,955 | 164,668 | 167,059 | $ 164,058
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | (20,830) | (17,257) |  |
Total intangible assets and goodwill | $ (20,830) | $ (17,257) |  |
Computer software [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Finite | Finite |  |
Intangible assets other than goodwill | $ 5,291 | $ 7,046 |  |
Total intangible assets and goodwill |  |  | 23,251 | 23,062
Computer software [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill | 5,291 | 7,046 | 9,813 |
Computer software [member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 25,060 | 23,280 |  |
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill | 25,060 | 23,280 | 23,251 |
Computer software [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | $ (19,769) | $ (16,234) |  |
Copyrights, patents and other industrial property rights, service and operating rights [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Finite | Finite |  |
Intangible assets other than goodwill | $ 189 | $ 460 |  |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Finite intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Total intangible assets and goodwill | 189 | 460 | 464 |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 1,250 | 1,483 |  |
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] |  |  |  |
Total intangible assets and goodwill | 1,250 | 1,483 | 1,448 | 1,524
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | $ (1,061) | $ (1,023) |  |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Indefinite | Indefinite |  |
Intangible assets other than goodwill | $ 98,518 | $ 98,596 |  |
Total intangible assets and goodwill | 98,518 | 98,596 | 96,500 |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Intangible assets other than goodwill | 98,518 | 98,596 |  |
Total intangible assets and goodwill | 98,518 | 98,596 | 96,500 | 97,386
Copyrights, patents and other industrial property rights, service and operating rights [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] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Indefinite | Indefinite |  |
Intangible assets other than goodwill | $ 1,950 | $ 3,337 |  |
Total intangible assets and goodwill | 1,950 | 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 | 1,950 | 3,337 |  |
Total intangible assets and goodwill | 1,950 | 3,337 | $ 3,651 | $ 3,698
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 |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Useful life | Indefinite | Indefinite |  |
Goodwill | $ 44,177 | $ 37,972 |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Goodwill | 44,177 | 37,972 |  |
Goodwill [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |  |
Goodwill | $ 0 | $ 0 |  |

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