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Compensation Plan for Outside Directors (Tables)
12 Months Ended
Dec. 31, 2014
Compensation Related Costs [Abstract]  
Summary of Total Accrued Compensation Cost Related to Outside Directors

The following table summarizes the total accrued compensation cost related to outside Directors, included in operating expenses in the accompanying consolidated statement of income, for the years ended December 31, 2014, 2013 and 2012:

 

     Year ended December 31,  
     2014      2013      2012  

Chairman Fee

   $ 61,357       $ 55,858       $ 57,680   

Adjustable Award

     544,756         575,242         282,703   

Non-adjustable Award

     358,630         322,538         242,179   
  

 

 

    

 

 

    

 

 

 
$ 964,743    $ 953,638    $ 582,562