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Taxes - Summary of income tax recognized (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Taxes      
Current tax € (218) € (466) € (215)
Deferred tax 20 231 1,433
Total taxes € (198) € (235) € 1,218