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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019:

 
  
Shares
    
Weighted Average
Grant Date Fair
Value Per Share
  
Balance at December 31, 2018
    
870,041
    
$
34.59
  
Granted
    
8,000
      
40.11
  
Vested
    
(36,889
)
    
32.72
  
Forfeited
    
(8,975
)
    
44.27
  
Balance at June 30, 2019
    
832,177
    
$
34.62