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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:

 
  
Shares
    
Weighted Average
Grant Date Fair
Value per Share
  
Balance at December 31, 2017
    
853,958
    
$
33.25
  
Granted
    
198,004
      
39.36
  
Vested
    
(167,811
)
    
39.90
  
Forfeited (1)
    
(14,110
)
    
42.28
  
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
  


(1)  Due to the lack of achievement of performance targets, performance-based shares forfeited in the years ended December 31, 2019 and 2018 were 20,508 shares and 2,085 shares, respectively.