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SCOPE OF CONSOLIDATION - Noncontrolling Interests (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]      
Equity attributable to non-controlling interests € 5,998 € 5,117  
Net profit attributable to non-controlling interests € 2,890 € 1,949 € 2,003