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Income taxes - Summary of major components of tax expense (income) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current tax expense:      
Current year € 9,251 € 11,540 € 12,564
Changes in estimates related to prior years (1,245) (187) 2,051
Deferred tax expense:      
Origination and reversal of temporary differences 1,545 (9,354) 1,567
Tax write-down 3,000 5,300  
Recognition of previously unrecognized deferred tax assets     (5,145)
Income tax expense reported in profit from continuing operations € 12,551 € 7,299 € 11,037