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Segment information - Goodwill, intangible assets, property, plant and equipment geographical information (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | $ 546,808 | $ 591,031
Subtotal Europe |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 320,956 | 354,167
Germany |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 136,710 | 145,837
Sweden |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 72,095 | 80,974
Italy |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 65,124 | 72,980
Poland |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 43,466 | 49,933
Rest of Europe |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 3,561 | 4,443
United States |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 85,243 | 70,530
South Korea |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 84,943 | 109,905
South Africa |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 29,081 | 32,007
Brazil |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 17,289 | 13,661
China |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | 9,261 | 10,733
Other |  |
Disclosure of geographical areas [line items] |  |
Goodwill, intangible assets, property, plant and equipment | $ 35 | $ 28

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_33_b&doctype=Standard -URIDate 2017-03-09 + Details
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