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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2018
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, 2018:

  
Shares
  
Weighted Average
Grant Date Fair
Value Per Share
 
Balance at December 31, 2017
  
853,958
  
$
33.25
 
Granted
  
9,129
   
37.53
 
Vested
  
(32,471
)
  
32.89
 
Forfeited
  
(9,850
)
  
42.29
 
Balance at September 30, 2018
  
820,766
  
$
33.20