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Cash and cash equivalents and short-term investments (Details) (EUR €)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Short-term Investments    
Cost basis € 930,005  
Unrealized Gains     
Unrealized Losses     
Recorded Basis 930,005   
Deposits [Member]
   
Short-term Investments    
Cost basis 650,017  
Unrealized Gains     
Unrealized Losses     
Recorded Basis 650,017  
Dutch Treasury Certificates [Member]
   
Short-term Investments    
Cost basis 279,988  
Unrealized Gains     
Unrealized Losses     
Recorded Basis € 279,988