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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-Based Compensation [Abstract]  
Non-vested 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, 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
  
Granted
    
142
      
59.45
          
Vested
    
(111
)
    
56.91
          
Cancelled
    
(63
)
    
64.71
          
Outstanding at December 31, 2018
    
380
      
66.02
      
21,239
  
Granted
    
134
      
60.04
          
Vested
    
(46
)
    
63.61
          
Cancelled
    
(64
)
    
62.39
          
Outstanding at December 31, 2019
    
404
    
$
64.89
    
$
26,710