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Share-based compensation (Details 2) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based compensation      
Share-based compensation expense (in dollars) $ 3,800,000 $ 2,700,000 $ 1,100,000
Income tax benefit (in dollars) 1,300,000 900,000 300,000
Nonqualified stock options (NQSOs)
     
Shares      
Outstanding at the beginning of the period (in shares) 215,500 374,500 375,500
Exercised (in shares) (160,000) (157,000)  
Expired (in shares)   (2,000) (1,000)
Outstanding at the end of the period (in shares) 55,500 215,500 374,500
Exercisable (in shares) 55,500 215,500 374,500
Weighted-average exercise price      
Outstanding, at the beginning of the period (in dollars per share) $ 20.76 $ 19.73 $ 19.73
Exercised (in dollars per share) $ 20.70 $ 18.32  
Expired (in dollars per share)   $ 20.49 $ 17.61
Outstanding, at the end of the period (in dollars per share) $ 20.92 $ 20.76 $ 19.73
Exercisable (in dollars per share) $ 20.92 $ 20.76 $ 19.73
Lower range of exercise prices (in dollars per share) $ 20.49    
Upper range of exercise prices (in dollars per share) $ 21.68    
Number of options (in shares) 55,500    
Weighted-average remaining contractual life (in years) 0.7    
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) $ 20.92    
Aggregate intrinsic value (in dollars) 500,000    
Cash received from exercise (in dollars) 3,312,000 2,876,000  
Intrinsic value of shares exercised (in dollars) 1,270,000 1,355,000  
Tax benefit realized for the deduction of exercises (in dollars) 181,000 278,000  
Nonqualified stock options (NQSOs) | 2002
     
Weighted-average exercise price      
Range of exercise prices (in dollars per share) $ 21.68    
Number of options (in shares) 20,000    
Weighted-average remaining contractual life (in years) 0.3    
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) $ 21.68    
Nonqualified stock options (NQSOs) | 2003
     
Weighted-average exercise price      
Range of exercise prices (in dollars per share) $ 20.49    
Number of options (in shares) 35,500    
Weighted-average remaining contractual life (in years) 1.0    
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) $ 20.49    
Stock appreciation rights (SARs)
     
Weighted-average exercise price      
Lower range of exercise prices (in dollars per share) $ 26.02    
Upper range of exercise prices (in dollars per share) $ 26.18    
Number of options (in shares) 282,000    
Weighted-average remaining contractual life (in years) 2.5    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.14    
Aggregate intrinsic value (in dollars) 200,000    
Shares      
Outstanding, beginning of period (in shares) 450,000 480,000 791,000
Exercised (in shares) (110,000)    
Forfeited (in shares)     (6,000)
Expired (in shares) (58,000) (30,000) (305,000)
Outstanding, end of period (in shares) 282,000 450,000 480,000
Exercisable (in shares) 282,000 450,000 480,000
Weighted-average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 26.13 $ 26.13 $ 26.12
Exercised (in dollars per share) $ 26.09    
Forfeited (in dollars per share)     $ 26.18
Expired (in dollars per share) $ 26.13 $ 26.18 $ 26.10
Outstanding at the end of the period (in dollars per share) $ 26.14 $ 26.13 $ 26.13
Exercisable (in dollars per share) $ 26.14 $ 26.13 $ 26.13
Shares vested     228,000
Aggregate fair value of vested shares (in dollars)     1,354,000
Intrinsic value of shares exercised 64,000    
Tax benefit realized for the deduction of exercises 25,000    
Dividend equivalent shares distributed under Section 409A     3,143
Weighted-average Section 409A distribution price (in dollars per share)     $ 13.64
Intrinsic value of shares distributed under Section 409A     43,000
Tax benefit realized for Section 409A distributions     $ 17,000
Number of months after end of calendar year within dividend equivalents subject to Section 409A will be paid 2.5    
Stock appreciation rights (SARs) | 2004
     
Weighted-average exercise price      
Range of exercise prices (in dollars per share) $ 26.02    
Number of options (in shares) 72,000    
Weighted-average remaining contractual life (in years) 2.3    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.02    
Stock appreciation rights (SARs) | 2005
     
Weighted-average exercise price      
Range of exercise prices (in dollars per share) $ 26.18    
Number of options (in shares) 210,000    
Weighted-average remaining contractual life (in years) 2.6    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.18