v3.26.1
Intangible assets and Goodwill - Development of Intangible Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Intangible assets and Goodwill      
Amount beginning of the year € 26,440 € 15,453  
Impairment     € (5,011)
Amount end of the year 31,571 26,440 15,453
Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Amount beginning of the year 213,452 191,800  
Foreign currency translation (7,520) 4,619  
Additions 16,953 14,769  
Disposals (124,681) (2)  
Divestment of affiliated companies (1,125)    
Reclassification   2,266  
Amount end of the year 97,080 213,452 191,800
Depreciation, amortization and impairments      
Intangible assets and Goodwill      
Amount beginning of the year (187,013) (176,348)  
Foreign currency translation 6,305 (4,184)  
Additions (9,477) (6,484)  
Disposals 124,676 2  
Amount end of the year (65,509) (187,013) (176,348)
Patents and licences      
Intangible assets and Goodwill      
Amount beginning of the year 934 861  
Amount end of the year 2,459 934 861
Patents and licences | Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Amount beginning of the year 11,397 11,166  
Foreign currency translation (29) (1)  
Additions 2,317    
Disposals (5,123) (2)  
Reclassification 476 234  
Amount end of the year 9,038 11,397 11,166
Patents and licences | Depreciation, amortization and impairments      
Intangible assets and Goodwill      
Amount beginning of the year (10,464) (10,304)  
Foreign currency translation   (1)  
Additions (765) (161)  
Disposals 5,123 2  
Reclassification (473)    
Amount end of the year (6,579) (10,464) (10,304)
Developed Technologies | Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Additions 14,636 14,769  
Developed Technologies | Internally generated      
Intangible assets and Goodwill      
Amount beginning of the year 19,831 4,574  
Amount end of the year 22,661 19,831 4,574
Developed Technologies | Internally generated | Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Amount beginning of the year 21,819 6,562  
Foreign currency translation (1,085) 488  
Additions 7,920 14,769  
Disposals (5)    
Divestment of affiliated companies (1,125)    
Reclassification (476)    
Amount end of the year 27,046 21,819 6,562
Developed Technologies | Internally generated | Depreciation, amortization and impairments      
Intangible assets and Goodwill      
Amount beginning of the year (1,988) (1,988)  
Additions (2,869)    
Reclassification 473    
Amount end of the year (4,385) (1,988) (1,988)
Developed Technologies | Acquired      
Intangible assets and Goodwill      
Amount beginning of the year 1,647 270  
Amount end of the year 6,090 1,647 270
Developed Technologies | Acquired | Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Amount beginning of the year 103,083 98,772  
Foreign currency translation (3,789) 2,279  
Additions 6,716    
Disposals (96,342)    
Reclassification   2,032  
Amount end of the year 9,670 103,083 98,772
Developed Technologies | Acquired | Depreciation, amortization and impairments      
Intangible assets and Goodwill      
Amount beginning of the year (101,436) (98,502)  
Foreign currency translation 3,669 (2,416)  
Additions (2,155) (518)  
Disposals 96,342    
Amount end of the year (3,579) (101,436) (98,502)
Customer relationships      
Intangible assets and Goodwill      
Amount beginning of the year 3,447 8,943  
Amount end of the year   3,447 8,943
Customer relationships | Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Amount beginning of the year 70,615 68,762  
Foreign currency translation (2,616) 1,853  
Disposals (23,211)    
Amount end of the year 44,788 70,615 68,762
Customer relationships | Depreciation, amortization and impairments      
Intangible assets and Goodwill      
Amount beginning of the year (67,168) (59,819)  
Foreign currency translation 2,635 (1,767)  
Additions (3,466) (5,582)  
Disposals 23,211    
Amount end of the year (44,788) (67,168) (59,819)
Trademarks      
Intangible assets and Goodwill      
Amount beginning of the year 582 804  
Amount end of the year 360 582 804
Trademarks | Gross/Acquisition and manufacturing costs      
Intangible assets and Goodwill      
Amount beginning of the year 6,539 6,539  
Amount end of the year 6,539 6,539 6,539
Trademarks | Depreciation, amortization and impairments      
Intangible assets and Goodwill      
Amount beginning of the year (5,957) (5,735)  
Additions (222) (222)  
Amount end of the year € (6,179) € (5,957) € (5,735)