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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Stock-Based Compensation [Abstract]  
Restricted Stock
The following table summarizes the stock grant amounts and activity for the years ended December 31, 2018 and 2019. 

 
Number of Shares
  
Grant Date Weighted
Average Fair Value
 
Nonvested at beginning of the year 2018
  
1,127
  

$37.76
 
Granted
  
3,743
   
$32.70
 
Vested
  
(1,790
)
  
$33.90
 
Forfeited
  
   
 
Nonvested at end of the year 2018
  
3,080
   
$33.85
 
Granted
  
6,963
   
$33.61
 
Vested
  
(2,701
)
  
$33.99
 
Forfeited
  
   
 
Nonvested at end of the year 2019
  
7,342
  

$33.57