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Segment information - Revenue geographical information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of geographical areas [line items] |  |  |  |
Revenues | $ 391,586 | $ 329,613 | $ 798,285 | $ 653,678
Germany |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 157,579 | 135,702 | 324,974 | 261,875
United States |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 100,290 | 82,422 | 196,905 | 166,407
South Korea |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 72,437 | 57,487 | 146,058 | 118,202
Brazil |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 21,349 | 19,503 | 43,265 | 39,096
China |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 16,860 | 12,717 | 38,486 | 25,833
South Africa |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 14,244 | 12,002 | 28,625 | 23,932
Other |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | 5,770 | 6,930 | 10,556 | 12,496
Rest of Europe |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenues | $ 3,057 | $ 2,850 | $ 9,416 | $ 5,837

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