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Long-term debt (Details 3) (EUR €)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2007
Estimated fair value of Eurobond      
Principal amount € 600,000   € 600,000
Carrying amount 710,095 695,618  
5.75 percent Eurobond [Member]
     
Estimated fair value of Eurobond      
Principal amount 600,000 600,000  
Carrying amount 710,095 695,618  
Fair Value € 700,644 [1] € 640,500 [1]  
[1] Source: Bloomberg Finance LP