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Share-based compensation (Details 4) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Weighted-average grant-date fair value per share        
Total weighted-average grant-date fair value $ 100,000 $ 100,000    
Tax benefits realized for the tax deductions 700,000 900,000 2,600,000 2,200,000
Restricted shares
        
Restricted stock awards and restricted stock units        
Outstanding, beginning of period (in shares)     4,503  
Outstanding, end of period (in shares) 4,503   4,503  
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share)     $ 22.21  
Outstanding, end of period (in dollars per share) $ 22.21   $ 22.21  
Unrecognized compensation cost 21,000   21,000  
Weighted-average period over which unrecognized compensation cost expected to be recognized     2 months 12 days  
Restricted stock units
        
Restricted stock awards and restricted stock units        
Outstanding, beginning of period (in shares) 264,326 300,313 288,151 315,094
Granted (in shares) 2,750 4,000 117,786 111,231
Vested (in shares) (3,500) (2,500) (142,361) (116,544)
Forfeited (in shares)   (11,321)   (19,289)
Outstanding, end of period (in shares) 263,576 290,492 263,576 290,492
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 25.74 $ 25.15 $ 25.17 $ 22.82
Granted (in dollars per share) $ 24.48 $ 26.48 $ 25.17 $ 26.88
Vested (in dollars per share) $ 23.50 $ 22.31 $ 24.07 $ 20.39
Forfeited (in dollars per share)   $ 25.88   $ 25.62
Outstanding, end of period (in dollars per share) $ 25.76 $ 25.16 $ 25.76 $ 25.16
Total weighted-average grant-date fair value     3,000,000 3,000,000
Unrecognized compensation cost 5,100,000   5,100,000  
Fair value of vested stock (in dollars)     4,100,000 3,600,000
Weighted-average period over which unrecognized compensation cost expected to be recognized     2 years 7 months 6 days  
Tax benefits realized for the tax deductions     1,300,000 1,000,000
LTIP linked to TRS
        
Restricted stock awards and restricted stock units        
Outstanding, beginning of period (in shares) 257,956 235,064 232,127 239,256
Granted (in shares) 0 1,505 97,524 91,038
Vested (in shares)     (70,189) (87,753)
Forfeited (in shares) 0 (4,442) (1,506) (10,414)
Outstanding, end of period (in shares) 257,956 232,127 257,956 232,127
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 28.45 $ 32.87 $ 32.88 $ 29.12
Granted (in dollars per share) $ 0.00 $ 32.69 $ 22.95 $ 32.69
Vested (in dollars per share)     $ 35.46 $ 22.45
Forfeited (in dollars per share) $ 0.00 $ 32.40 $ 28.32 $ 32.72
Outstanding, end of period (in dollars per share) $ 28.45 $ 32.88 $ 28.45 $ 32.88
Total weighted-average grant-date fair value 0 0 2,200,000 3,000,000
Unrecognized compensation cost 2,700,000   2,700,000  
Fair value of vested stock (in dollars)       2,200,000
Weighted-average period over which unrecognized compensation cost expected to be recognized     1 year 3 months 18 days  
Tax benefits realized for the tax deductions       900,000
LTIP awards linked to other performance conditions
        
Restricted stock awards and restricted stock units        
Outstanding, beginning of period (in shares) 359,782 304,473 296,843 247,175
Granted (in shares) 0 1,504 129,603 120,399
Vested (in shares)     (65,089) (18,280)
Cancelled (shares)   0   (37,346)
Forfeited (in shares) 0 (4,881) (1,575) (10,852)
Outstanding, end of period (in shares) 359,782 301,096 359,782 301,096
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 26.01 $ 26.12 $ 26.14 $ 25.04
Granted (in dollars per share) $ 0.00 $ 27.11 $ 25.18 $ 26.89
Vested (in dollars per share)     $ 24.95 $ 18.95
Cancelled (in dollars per share)   $ 0.00   $ 24.96
Forfeited (in dollars per share) $ 0.00 $ 26.53 $ 26.07 $ 26.20
Outstanding, end of period (in dollars per share) $ 26.01 $ 26.12 $ 26.01 $ 26.12
Total weighted-average grant-date fair value 0 0 3,300,000 3,200,000
Unrecognized compensation cost 4,000,000   4,000,000  
Fair value of vested stock (in dollars)     1,900,000 600,000
Weighted-average period over which unrecognized compensation cost expected to be recognized     1 year 3 months 18 days  
Tax benefits realized for the tax deductions     $ 800,000 $ 200,000