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Income taxes - Expense (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income taxes      
Current tax expense   € (2)  
Deferred tax (expense) € (80)   € (64)
Income tax benefit (expense) € (80) € (2) € (64)