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Employee benefits (Details 7)
12 Months Ended
Dec. 31, 2012
USD denominated [Member]
USD ($)
Dec. 31, 2011
USD denominated [Member]
USD ($)
Dec. 31, 2010
USD denominated [Member]
USD ($)
Dec. 31, 2012
EUR denominated [Member]
EUR (€)
Dec. 31, 2011
EUR denominated [Member]
EUR (€)
Dec. 31, 2010
EUR denominated [Member]
EUR (€)
Share plan            
Conditionally outstanding shares, Beginning balance 264,891     1,479,297    
Conditionally outstanding shares, Weighted average grant date fair value, Beginning balance $ 32.35     € 24.19    
Granted 110,465     678,505    
Granted, Weighted average grant date fair value $ 47.71 $ 39.00 $ 31.66 € 36.15 € 28.09 € 23.51
Vested/Issued (106,500)     (421,902)    
Vested/Issued, Weighted average grant date fair value $ 31.05     € 20.88    
Forfeited (19,762)     (42,290)    
Forfeited, Weighted average grant date fair value $ 37.55     € 19.91    
Conditionally outstanding shares, Ending balance 249,094 264,891   1,693,610 1,479,297  
Conditionally outstanding shares, Weighted average grant date fair value, Ending balance $ 40.71 $ 32.35   € 29.92 € 24.19