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Other operating expenses - Summary of other operating expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other operating expenses      
Legal and other consulting expenses € 28,778 € 42,952 € 46,886
Software-as-a Service and similar rights 17,614 13,664 9,482
Travel expenses 8,742 6,524 1,803
Marketing expenses 7,830 7,798 5,341
Insurance 6,618 12,225 4,961
Office expenses 5,082 3,772 3,028
Telecommunication and IT expenses 4,994 4,652 12,523
Other external and administrative costs 9,785 4,304 3,284
Total € 89,443 € 95,891 € 87,308