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Stock-Based Compensation Plans (Tables)
6 Months Ended
Jun. 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 six months ended June 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
  
(25,845
)
  
35.38
 
Forfeited
  
(3,950
)
  
42.82
 
Balance at June 30, 2018
  
833,292
  
$
33.18