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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Stock-Based Compensation Plans [Abstract]  
Restricted and Performance-based Share Activity Our restricted and performance-based share activity was as follows for the nine months ended September 30, 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
    
(68,945
)
    
28.89
  
Forfeited
    
(11,950
)
    
44.11
  
Balance at September 30, 2019
    
993,796
    
$
36.40