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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Shareholders' Equity  
Schedule of number of shares of common stock in treasury

 

 

 
   December 31,  
 
   2013   2012   2011  

Balance at beginning of period

     740,278     813,980     865,703  

Shares issued under stock offering program

     (610,389 )   —     —  

Shares distributed/exercised

     (79,530 )   (113,439 )   (72,171 )

Shares purchased

     24,766     39,737     15,448  

Shares forfeited

     —     —     5,000  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at end of period

     75,125     740,278     813,980  
               
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