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Staff costs (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Staff costs      
Wages and salaries € (116,408) € (61,619) € (46,677)
Social security costs (16,858) (11,003) (9,081)
Pension costs (4,715) (2,994) (2,175)
Other personnel costs (39,109) (27,375) (16,465)
Total personnel costs (177,090) (102,991) (74,398)
Costs for warrants granted € 32,500 € 21,300 € 11,800