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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Stock-Based Compensation  
Summary of the Company's stock option and restricted stock activity

 

 

 
   Stock
Options		   Weighted-
Average
Exercise
Price		   Aggregate
Intrinsic
Value		   Restricted
Stock		   Weighted-
Average
Grant-Date
Fair Value		  

Outstanding (stock options); non-vested (restricted stock) at December 31, 2012

     55,400   $ 38.13   $ 603     22,378   $ 44.59  

Granted

     9,900     57.74     34     16,425     55.55  

Exercised (stock options); vested (restricted stock)

     (10,500 )   33.41     (263 )   (18,315 )   46.46  

Forfeited

     —     —     —     (208 )   52.54  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding (stock options); non-vested (restricted stock) at December 31, 2013

     54,800   $ 42.58   $ 1,019     20,280   $ 51.69  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

Exercisable at December 31, 2013

     54,800   $ 42.58   $ 1,019     n/a     n/a  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       


 

 
   2013   2012   2011  

Weighted-average fair value of stock options granted during the year

   $ 12.47   $ 9.51   $ 13.99  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Weighted-average remaining contractual life for stock options in years

     6.04     6.21     5.64  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Total fair value of stock options vested during the year

   $ 123   $ 94   $ 133  

Total intrinsic value of stock options exercised during the year

   $ 263   $ 559   $ 606  

Total fair value of restricted stock vested during the year

   $ 811   $ 988   $ 715