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Share-based compensation (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based compensation      
Share-based compensation expense (in dollars) $ 7,800,000 $ 6,700,000 $ 4,300,000
Income tax benefit (in dollars) 2,800,000 2,400,000 1,500,000
Shares      
Granted (in shares) 0 0 0
Forfeited (in shares) 0 0 0
Weighted-average exercise price      
Granted (in dollars per share) $ 0.00 $ 0.00 $ 0.00
Forfeited (in dollars per share) $ 0.00 $ 0.00 $ 0.00
Shares      
Granted (in shares) 0    
LTIP linked to TRS
      
Share-based compensation      
Income tax benefit (in dollars) 900,000 200,000  
Shares      
Outstanding, beginning of period (in shares) 239,256 197,385 126,782
Granted (in shares) 91,038 81,223 75,015
Forfeited (in shares) (10,414) (3,955) (4,412)
Expired (in shares) (17,548)    
Outstanding, end of period (in shares) 232,127 239,256 197,385
Shares vested 87,753 35,397 0
Shares settled 70,205    
Aggregate fair value of vested shares 2,200,000 600,000  
Weighted-average exercise price      
Granted (in dollars per share) $ 32.69 $ 30.71 $ 35.46
Nonqualified stock options (NQSOs)
      
Shares      
Outstanding at the beginning of the period (in shares) 14,000 55,500 215,500
Exercised (in shares) (14,000) (41,500) (160,000)
Expired (in shares) 0 0 0
Outstanding at the end of the period (in shares) 0 14,000 55,500
Exercisable (in shares) 0 14,000 55,500
Weighted-average exercise price      
Outstanding, at the beginning of the period (in dollars per share) $ 20.49 $ 20.92 $ 20.76
Exercised (in dollars per share) $ 20.49 $ 21.06 $ 20.70
Expired (in dollars per share) $ 0.00 $ 0.00 $ 0.00
Outstanding, at the end of the period (in dollars per share) $ 0.00 $ 20.49 $ 20.92
Exercisable (in dollars per share) $ 0.00 $ 20.49 $ 20.92
Cash received from exercise (in dollars) 287,000 874,000 3,312,000
Intrinsic value of shares exercised (in dollars) 128,000 354,000 1,270,000
Tax benefit realized for the deduction of exercises (in dollars) 50,000 138,000 181,000
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 shares underlying SARs 164,000    
Weighted-average remaining contractual life 10 months 24 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.12    
Intrinsic value of equity instruments other than options, vested 100,000    
Shares      
Outstanding, beginning of period (in shares) 164,000 282,000 450,000
Granted (in shares)   0 0
Exercised (in shares) 0 (114,000) (110,000)
Forfeited (in shares) 0 0 0
Expired (in shares) 0 (4,000) (58,000)
Outstanding, end of period (in shares) 164,000 164,000 282,000
Exercisable (in shares) 164,000 164,000 282,000
Intrinsic value of shares exercised 0 197,000 64,000
Tax benefit realized for the deduction of exercises 0 77,000 25,000
Weighted-average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 26.12 $ 26.14 $ 26.13
Granted (in dollars per share) $ 0.00 $ 0.00 $ 0.00
Exercised (in dollars per share) $ 0.00 $ 26.17 $ 26.09
Forfeited (in dollars per share) $ 0.00 $ 0.00 $ 0.00
Expired (in dollars per share) $ 0.00 $ 26.18 $ 26.13
Outstanding at the end of the period (in dollars per share) $ 26.12 $ 26.12 $ 26.14
Exercisable (in dollars per share) $ 26.12 $ 26.12 $ 26.14
Stock appreciation rights (SARs) | 2004
      
Weighted-average exercise price      
Range of exercise prices (in dollars per share) $ 26.02    
Number of shares underlying SARs 62,000    
Weighted-average remaining contractual life 3 months 18 days    
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 shares underlying SARs 102,000    
Weighted-average remaining contractual life 1 year 3 months 18 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.18    
As previously filed
      
Share-based compensation      
Share-based compensation expense (in dollars)   5,900,000 3,800,000
Income tax benefit (in dollars)   2,000,000 1,300,000
Difference
      
Share-based compensation      
Share-based compensation expense (in dollars)   800,000 500,000
Income tax benefit (in dollars)   $ 400,000 $ 200,000