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Share-based compensation (Details 3) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2012
Restricted shares
Jun. 30, 2013
Restricted shares
Jun. 30, 2012
Restricted shares
Mar. 31, 2013
Restricted shares
Jun. 30, 2013
Restricted stock units
Jun. 30, 2012
Restricted stock units
Jun. 30, 2013
Restricted stock units
Jun. 30, 2012
Restricted stock units
Restricted stock awards and restricted stock units                        
Outstanding, beginning of period (in shares)         38,107 9,005 46,807 9,005 301,145 318,551 315,094 247,286
Granted (in shares)                   2,334 107,231 94,846
Vested (in shares)         (23,300)   (32,000)   (832) (250) (114,044) (21,497)
Forfeited (in shares)                   (1,564) (7,968) (1,564)
Outstanding, end of period (in shares)         14,807 9,005 14,807 9,005 300,313 319,071 300,313 319,071
Weighted-average grant-date fair value per share                        
Outstanding, beginning of period (in dollars per share)         $ 23.83 $ 22.21 $ 24.45 $ 22.21 $ 25.15 $ 22.80 $ 22.82 $ 21.80
Granted (in dollars per share)                   $ 26.75 $ 26.89 $ 26.00
Vested (in dollars per share)         $ 24.71   $ 25.38   $ 26.60 $ 26.25 $ 20.34 $ 24.97
Forfeited (in dollars per share)                   $ 25.53 $ 25.26 $ 25.53
Outstanding, end of period (in dollars per share)         $ 22.45 $ 22.21 $ 22.45 $ 22.21 $ 25.15 $ 22.81 $ 25.15 $ 22.81
Total weighted-average grant-date fair value                   $ 62,000 $ 2,900,000 $ 2,500,000
Unrecognized compensation cost           100,000     4,900,000   4,900,000  
Weighted-average period over which unrecognized compensation cost expected to be recognized           1 year 4 months 24 days         2 years 9 months 18 days  
Fair value of vested stock (in dollars)             800,000       3,500,000 600,000
Tax benefits realized for the tax deductions $ 400,000 $ 600,000 $ 1,100,000 $ 1,200,000     $ 200,000       $ 1,000,000 $ 200,000