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Other operating income, other operating expenses, restructuring income and expenses, financial result - Other operating income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Analysis of income and expense [abstract] |  |  |  |
Increase (decrease) in other operating income |  |  |  | $ (1,815)
Other operating income | $ 296 | $ 2,127 | $ 459 | $ 2,274
Reimbursement of property tax paid |  |  | $ 1,432 |

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