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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-Based Compensation [Abstract]  
Summary of Nonvested Stock and Performance Unit Activity
The following table summarizes the non-vested stock and performance stock unit activity:

 
(In thousands except fair value)
 
Shares
  
Grant Date
Weighted Average
Fair Value
  
Aggregate Intrinsic
Value
 
Outstanding at December 31, 2014
  
604
  
$
43.84
  
$
36,454
 
Granted
  
154
   
60.65
     
Vested
  
(74
)
  
35.51
     
Cancelled
  
(142
)
  
47.02
     
Outstanding at December 31, 2015
  
542
   
48.94
   
34,063
 
Granted
  
119
   
69.92
     
Vested
  
(172
)
  
43.42
     
Cancelled
  
(54
)
  
52.41
     
Outstanding at December 31, 2016
  
435
   
56.44
   
34,184
 
Granted
  
115
   
74.26
     
Vested
  
(114
)
  
39.75
     
Cancelled
  
(24
)
  
63.62
     
Outstanding at December 31, 2017
  
412
  
$
65.64
  
$
30,113