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Share-based compensation (Details 3) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Weighted-average grant-date fair value per share      
Tax benefits realized for the tax deductions $ 1,300,000 $ 900,000 $ 300,000
Restricted shares
     
Restricted stock awards and restricted stock units      
Outstanding, beginning of period (in shares) 89,709 129,000 160,500
Granted (in shares)   18,009  
Vested (in shares) (40,102) (43,565) (3,851)
Forfeited (in shares) (2,800) (13,735) (27,649)
Outstanding, end of period (in shares) 46,807 89,709 129,000
Weighted-average grant-date fair value per share      
Outstanding, beginning of period (in dollars per share) $ 24.64 $ 25.50 $ 25.51
Granted (in dollars per share)   $ 22.21  
Vested (in dollars per share) $ 24.83 $ 26.29 $ 24.52
Forfeited (in dollars per share) $ 24.93 $ 24.35 $ 25.67
Outstanding, end of period (in dollars per share) $ 24.45 $ 24.64 $ 25.50
Total weighted-average grant-date fair value 400,000    
Fair value of vested stock (in dollars) 1,000,000 1,100,000 100,000
Tax benefits realized for the tax deductions 200,000 300,000 100,000
Unrecognized compensation cost 300,000    
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years) 2.4    
Restricted stock units
     
Restricted stock awards and restricted stock units      
Outstanding, beginning of period (in shares) 146,500 70,500  
Granted (in shares) 101,786 77,500 70,500
Vested (in shares)   (250)  
Forfeited (in shares) (1,000) (1,250)  
Outstanding, end of period (in shares) 247,286 146,500 70,500
Weighted-average grant-date fair value per share      
Outstanding, beginning of period (in dollars per share) $ 19.80 $ 16.99  
Granted (in dollars per share) $ 24.68 $ 22.30 $ 16.99
Vested (in dollars per share)   $ 16.99  
Forfeited (in dollars per share) $ 22.60 $ 16.99  
Outstanding, end of period (in dollars per share) $ 21.80 $ 19.80 $ 16.99
Total weighted-average grant-date fair value 2,500,000 1,700,000 1,200,000
Unrecognized compensation cost $ 2,900,000    
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years) 2.7