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Related party transactions - President, CEO (Details) - Rajeev Suri - EUR (€)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related party transactions      
Base salary / fee € 1,050,000 € 1,050,000 € 1,049,044
Cash incentive payments 873,862 997,369 780,357
Share-based payment expenses 1,978,268 2,606,613 5,296,960
Pension expenses 312,607 338,787 469,737
Total € 4,214,737 € 4,992,769 € 7,596,098