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Income and Expenses - Finance Income (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis Of Income And Expense [Abstract]      
Interest income € 1,564 € 1,781 € 1,996
Foreign exchange gains, net   2,341 6,050
Total [1] € 1,564 € 4,122 € 8,046
[1] Foreign exchange differences on a cumulative basis are shown either as finance income or expenses and might switch between those two positions during the year-to-date reporting periods.