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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Stock-Based Compensation Plans [Abstract]  
Restricted and Performance-Based Share Activity
Our restricted and performance-based share activity was as follows for the years ended December 31, 2020 and 2019:

 
  
Shares
    
Weighted Average
Grant Date Fair
Value per Share
  
Balance at December 31, 2018
    
870,041
    
$
34.59
  
Granted
    
204,650
      
42.05
  
Vested
    
(188,693
)
    
38.08
  
Forfeited (1)
    
(33,458
)
    
43.32
  
Balance at December 31, 2019
    
852,540
    
$
35.26
  
Granted
    
208,200
      
38.21
  
Vested
    
(161,054
)
    
39.23
  
Forfeited (1)
    
(60,000
)
    
42.25
  
Balance at December 31, 2020
    
839,686
    
$
34.77
  


(1)  Due to the lack of achievement of performance targets, performance-based shares forfeited in the years ended December 31, 2020 and 2019 were 50,250 shares and 20,508 shares, respectively.