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Related party transactions - President, CEO (Details) - Rajeev Suri - EUR (€)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related party transactions      
Base salary / fee € 1,050,000 € 1,049,044 € 1,000,000
Cash incentive payments 997,369 780,357 1,922,195
Share-based payment expenses 2,606,613 5,296,960 4,604,622
Pension expenses 338,787 469,737 491,641
Total € 4,992,769 € 7,596,098 € 8,018,458