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Share-based compensation (Details 2) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Share-based compensation          
Share-based compensation expense (in dollars) $ 1,100,000 $ 1,700,000 $ 3,000,000 $ 3,500,000  
Income tax benefit (in dollars) 400,000 600,000 1,100,000 1,200,000  
Nonqualified stock options (NQSOs)
         
Share-based compensation          
Outstanding shares (in shares) 0   0   14,000
Weighted-average exercise price (in dollars per share)         $ 20.49
Shares exercised 12,000 21,500 14,000 33,500  
Weighted-average exercise price (in dollars per share) $ 20.49 $ 20.93 $ 20.49 $ 21.20  
Cash received from exercise (in dollars) 246,000 450,000 287,000 710,000  
Intrinsic value of shares exercised (in dollars) 113,000 174,000 128,000 265,000  
Tax benefit realized for the deduction of exercises (in dollars) 44,000 68,000 50,000 103,000  
Stock appreciation rights (SARs)
         
Share-based compensation          
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   164,000    
Weighted-average remaining contractual life     1 year 4 months 24 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.12   $ 26.12    
Outstanding shares (in shares)         164,000
Weighted-average exercise price (in dollars per share)         $ 26.12
Aggregate intrinsic value (in dollars) 0   0    
Shares exercised   112,000   112,000  
Weighted-average price of shares exercised (in dollars per share)   $ 26.17   $ 26.17  
Intrinsic value of shares exercised (in dollars)   194,000   194,000  
Tax benefit realized for the deduction of exercises (in dollars)   $ 76,000   $ 76,000  
Stock appreciation rights (SARs) | 2004
         
Share-based compensation          
Range of exercise prices (in dollars per share)     $ 26.02    
Number of shares underlying SARs 62,000   62,000    
Weighted-average remaining contractual life     9 months 18 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.02   $ 26.02    
Stock appreciation rights (SARs) | 2005
         
Share-based compensation          
Range of exercise prices (in dollars per share)     $ 26.18    
Number of shares underlying SARs 102,000   102,000    
Weighted-average remaining contractual life     1 year 9 months 18 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.18   $ 26.18