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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-Based Compensation  
Schedule of assumptions used to estimate fair value at grant date using Black-Scholes option-pricing model

 

 

 
   Years Ended December 31,
 
   2013   2012   2011

Expected dividend yield

   NA   NA   1.68%

Expected volatility

   NA   NA   0.36

Risk-free interest rate

   NA   NA   4.76%

Expected holding period

   NA   NA   6.5 years
Schedule of stock option activity

 

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   Shares
Under
Option		   Weighted
Average
Exercise Price		   Shares
Under
Option		   Weighted
Average
Exercise Price		   Shares
Under
Option		   Weighted
Average
Exercise Price		  

Outstanding at beginning of year

     87,500   $ 39.24     125,700   $ 37.63     151,003   $ 37.30  

Exercised during the year

     (67,300 )   38.52     (36,900 )   33.63     (25,303 )   35.66  

Forfeited during the year

     —     —     (1,300 )   42.85     —     —  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at end of year

     20,200     41.64     87,500     39.24     125,700     37.63  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                 

Exercisable at end of year

     20,200   $ 41.64     87,500   $ 39.24     125,700   $ 37.63  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                 
Schedule of restricted stock and performance-based restricted stock activity

 

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   Shares
Under
Restriction		   Weighted
Average
Fair Value		   Shares
Under
Restriction		   Weighted
Average
Fair Value		   Shares
Under
Restriction		   Weighted
Average
Fair Value		  

Outstanding at beginning of year

     263,883   $ 41.47     282,117   $ 39.24     301,501   $ 35.13  

Granted during the year

     57,632     47.87     102,756     41.79     95,204     46.78  

Vested and unrestricted during the year

     (103,788 )   40.75     (117,936 )   36.50     (114,009 )   34.67  

Forfeited during the year

     (6,493 )   43.48     (3,054 )   38.13     (579 )   37.75  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at end of year

     211,234   $ 43.51     263,883   $ 41.47     282,117   $ 39.24  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                 


 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   Performance-
based
Shares Under
Restriction		   Weighted
Average
Fair Value		   Performance-
based
Shares Under
Restriction		   Weighted
Average
Fair Value		   Performance-based
Shares Under
Restriction		   Weighted
Average
Fair Value		  

Granted during the year

     37,456     44.13     —     —     —     —  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at end of year

     37,456   $ 44.13     —   $ —     —   $ —  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​