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Other intangible assets (Details) (EUR €)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cost      
Cost, Beginning Balance € 107,245 € 107,245  
Additions 7,658    
Cost, Ending Balance 114,903 107,245 107,245
Accumulated amortization      
Accumulated amortization, Beginning Balance 98,879 93,594  
Amortization 6,081 5,285 5,500
Accumulated amortization, Ending Balance 104,960 98,879 93,594
Carrying amount      
Carrying amount 9,943 8,366  
Intellectual property [Member]
      
Cost      
Cost, Beginning Balance 47,250 47,250  
Additions 7,658    
Cost, Ending Balance 54,908 47,250  
Accumulated amortization      
Accumulated amortization, Beginning Balance 47,228 47,224  
Amortization 800 4  
Accumulated amortization, Ending Balance 48,028 47,228  
Carrying amount      
Carrying amount 6,880 22  
Developed technology [Member]
      
Cost      
Cost, Beginning Balance 25,883 25,883  
Additions       
Cost, Ending Balance 25,883 25,883  
Accumulated amortization      
Accumulated amortization, Beginning Balance 21,123 17,043  
Amortization 4,080 4,080  
Accumulated amortization, Ending Balance 25,203 21,123  
Carrying amount      
Carrying amount 680 4,760  
Customer relationships [Member]
      
Cost      
Cost, Beginning Balance 8,733 8,733  
Additions       
Cost, Ending Balance 8,733 8,733  
Accumulated amortization      
Accumulated amortization, Beginning Balance 5,277 4,185  
Amortization 1,092 1,092  
Accumulated amortization, Ending Balance 6,369 5,277  
Carrying amount      
Carrying amount 2,364 3,456  
In-process R&D [Member]
      
Cost      
Cost, Beginning Balance 23,148 23,148  
Additions       
Cost, Ending Balance 23,148 23,148  
Accumulated amortization      
Accumulated amortization, Beginning Balance 23,148 23,148  
Amortization 100     
Accumulated amortization, Ending Balance 23,148 23,148  
Carrying amount      
Carrying amount 0 0  
Other [Member]
      
Cost      
Cost, Beginning Balance 2,231 2,231  
Additions       
Cost, Ending Balance 2,231 2,231  
Accumulated amortization      
Accumulated amortization, Beginning Balance 2,103 1,994  
Amortization 109 109  
Accumulated amortization, Ending Balance 2,212 2,103  
Carrying amount      
Carrying amount € 19 € 128