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Other intangible assets (Details 1) (EUR €)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other intangible assets (Textual) [Abstract]      
Intellectual property acquired from third parties € 7,658,000    
Impairment charges 0 0 0
Amortization 6,081,000 5,285,000 5,500,000
Future amortization expenses      
2013 3,322,000    
2014 2,624,000    
2015 1,714,000    
2016 1,533,000    
2017 750,000    
Thereafter       
Amortization expenses 9,943,000    
Intellectual property [Member]
     
Other intangible assets (Textual) [Abstract]      
Intellectual property acquired from third parties 7,658,000    
Amortization 800,000 4,000  
In-process R&D [Member]
     
Other intangible assets (Textual) [Abstract]      
Intellectual property acquired from third parties       
Amortization 100,000     
Cost of Sales [Member]
     
Other intangible assets (Textual) [Abstract]      
Amortization € 6,000,000 € 5,300,000 € 5,500,000