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Other operating income, other operating expenses, restructuring income and expenses, financial result - Other operating expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Analysis of income and expense [abstract] |  |  |  |
Increase (decrease) in other operating expense |  |  |  | $ (734)
Other operating expenses | $ 1,561 | $ 1,097 | $ 3,556 | 4,290
Consulting fees related to Group strategy | $ 151 | $ 810 | 1,035 | 1,049
Miscellaneous expenses |  |  | 1,525 | 199
Allowance on trade receivables recorded |  |  | $ 172 | $ 637

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