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Income and expenses - Contract balances (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income and expenses      
Trade receivables, included in 'trade and other receivables' € 55,906 € 53,718 € 53,505
Contract assets / Contracts in progress   590 637
Contract liabilities / deferred income / Advances Received on contracts € 52,208 € 51,792 € 50,390