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Financial Instruments - Trade Receivables - Movement in the bad debt provision (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Movement in the bad debt provision      
Opening balance € 20,531 € 19,706 € 17,987
Net charges for the year 4,971 6,443 8,003
Net cancellations for the year (3,142) (5,650) (4,732)
Transfers (19)    
Translation differences (50) 32 (1,552)
Closing balance € 22,291 € 20,531 € 19,706