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Long-term debt (Details 2) (EUR €)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2007
Summary of carrying amount of outstanding Eurobond and fair value of interest rate swaps      
Principal amount € 600,000   € 600,000
Carrying amount 710,095 695,618  
5.75 percent Eurobond [Member]
     
Summary of carrying amount of outstanding Eurobond and fair value of interest rate swaps      
Principal amount 600,000 600,000  
Fair value interest rate swaps 110,095 95,618  
Carrying amount € 710,095 € 695,618