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Cash and Cash Equivalents (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents        
Other cash equivalents € 12,001 € 14,004 € 41,767  
Cash at bank and at hand 93,686 21,837 14,925  
Cash and cash equivalents € 105,687 € 35,840 € 56,692 € 59,051