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Share-based compensation (Details 2) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Share-based compensation      
Share-based compensation expense (in dollars) $ 1,900,000 $ 1,800,000  
Income tax benefit (in dollars) 700,000 600,000  
Nonqualified stock options (NQSOs)
     
Share-based compensation      
Outstanding shares (in shares)     14,000
Weighted-average exercise price (in dollars per share)     $ 20.49
Aggregate intrinsic value (in dollars) 100,000    
Shares exercised 2,000 12,000  
Weighted-average exercise price (in dollars per share) $ 20.49 $ 21.68  
Cash received from exercise (in dollars) 41,000 260,000  
Intrinsic value of shares exercised (in dollars) 15,000 91,000  
Tax benefit realized for the deduction of exercises (in dollars) 6,000 36,000  
Nonqualified stock options (NQSOs) | 2003
     
Share-based compensation      
Exercise price (in dollars per share) $ 20.49    
Number of shares underlying SARs 12,000    
Weighted-average remaining contractual life 1 month 6 days    
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) $ 20.49    
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    
Weighted-average remaining contractual life 1 year 8 months 12 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.12    
Outstanding shares (in shares)     164,000
Weighted-average exercise price (in dollars per share)     $ 26.12
Aggregate intrinsic value (in dollars) $ 300,000    
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    
Weighted-average remaining contractual life 1 year 1 month 6 days    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 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    
Weighted-average remaining contractual life 2 years    
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) $ 26.18