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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of restricted share and performance share activity
A summary of restricted share activity for the three months ended March 31, 2019 is as follows:

 
2019
 
Time-Based
 
Performance-Based
 
Number of Shares
 
Weighted Average
Grant Date
Fair Value
 
Number of Shares
 
Weighted Average
Grant Date
Fair Value
 
(In whole shares)
 
 
 
(In whole shares)
 
 
Outstanding - beginning of year
529,947

 
$
35.98

 

 
$

Granted
41,000

 
32.53

 
50,000

 
32.55

Vested
(74,834
)
 
35.93

 

 

Cancelled or expired
(3,000
)
 
43.70

 

 

Outstanding - end of period
493,113

 
$
35.65

 
50,000

 
$
32.55