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Share-based compensation (Details 4) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Y
Jun. 30, 2011
Dec. 31, 2011
Y
Long-term incentive plan (LTIP)
            
Share-based compensation            
Payout low end of range (as a percent)       0.00%    
Payout high end of range (as a percent)       200.00%    
LTIP linked to TRS
            
Share-based compensation            
Period for calculating total return to shareholders (in years)       3    
LTIP linked to TRS and other performance conditions (in shares)            
Outstanding, beginning of period (in shares)   239,470 200,735 197,385 126,782 126,782
Granted (in shares) 1,442 1,442 475 78,924 75,015  
Vested (in shares)       (35,397)    
Forfeited (in shares)   (1,505) (1,647) (1,505) (2,234)  
Outstanding, end of period (in shares)   239,407 199,563 239,407 199,563 197,385
Weighted-average grant-date fair value per share            
Outstanding, beginning of period (in dollars per share)   $ 29.12 $ 25.94 $ 25.94 $ 20.33 $ 20.33
Granted (in dollars per share) $ 26.75 $ 30.71 $ 35.46 $ 30.71 $ 35.46  
Vested (in dollars per share)       $ 14.85    
Forfeited (in dollars per share)   $ 30.39 $ 22.45 $ 30.39 $ 22.45  
Outstanding, end of period (in dollars per share)   $ 29.12 $ 25.99 $ 29.12 $ 25.99 $ 25.94
Total weighted-average grant-date fair value $ 44,000     $ 2,400,000 $ 2,700,000  
Grant date price, second (in dollars per share) $ 30.71          
Risk-free interest rate (as a percent)       0.33%   1.25%
Expected life (in years)       3   3
Expected volatility (as a percent)       25.30%   27.80%
Range of expected volatility for Peer Group, minimum (as a percent)       15.50%   21.20%
Range of expected volatility for Peer Group, maximum (as a percent)       34.50%   82.60%
Grant date fair value (in dollars per share)   $ 30.71   $ 30.71   $ 35.46
Unrecognized compensation cost   3,500,000   3,500,000    
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years)       1.5    
Aggregate fair value of vested shares and related dividends       600,000    
Tax benefits       200,000    
LTIP linked to other performance conditions
            
LTIP linked to TRS and other performance conditions (in shares)            
Outstanding, beginning of period (in shares)   297,602 273,550 182,498 161,310 161,310
Granted (in shares) 3,600 3,600 712 118,704 113,831  
Cancelled (in shares)     (81,908)   (81,908)  
Forfeited (in shares)   (6,018) (6,587) (6,018) (7,466)  
Outstanding, end of period (in shares)   295,184 185,767 295,184 185,767  
Weighted-average grant-date fair value per share            
Outstanding, beginning of period (in dollars per share)   $ 23.92 $ 21.26 $ 22.63 $ 18.66 $ 18.66
Granted (in dollars per share) $ 26.75 $ 26.75 $ 26.25 $ 26.00 $ 24.96  
Cancelled (in dollars per share)     $ 18.38   $ 18.38  
Forfeited (in dollars per share)   $ 24.23 $ 18.95 $ 24.23 $ 18.95  
Outstanding, end of period (in dollars per share)   $ 23.95 $ 22.63 $ 23.95 $ 22.63  
Total weighted-average grant-date fair value 100,000     3,100,000 2,800,000  
Grant date price, second (in dollars per share) $ 26.75          
Unrecognized compensation cost   $ 4,100,000   $ 4,100,000    
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years)       1.7    
2011-2013 LTIP linked to TRS
            
Share-based compensation            
Period for calculating performance goals based on average consolidated net income (in years)       3    
Period for calculating performance goals based on average net income (in years)       3    
2010-2012 LTIP
            
Share-based compensation            
Average period used to calculate performance goals (in years)       2