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Cash and Cash Equivalents (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents        
Current deposits € 63 € 441,614    
Cash in hand and at banks 741,919 592,178    
Total cash and cash equivalents € 741,982 € 1,033,792 € 886,521 € 895,009