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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2016
Share-Based Compensation [Abstract]  
Summary of Transaction Involving Stock Options
The following table summarizes the transactions involving the Company’s stock option plans:
 
(In thousands except exercise price and life)
 
Options
  
Weighted
Average
Exercise Price
  
Weighted
Average
Remaining Life
(Years)
  
Aggregate
Intrinsic Value
 
             
Outstanding at December 31, 2013
  
93
  
$
23.04
   
2.2
  
$
2,374
 
Exercised
  
(27
)
  
21.92
         
Outstanding at December 31, 2014
  
66
   
23.49
   
1.7
   
2,438
 
Exercised
  
(21
)
  
20.59
         
Outstanding at December 31, 2015
  
45
   
24.84
   
1.2
   
1,715
 
Exercised
  
(30
)
  
23.11
         
Outstanding at December 31, 2016
  
15
   
28.45
   
0.9
   
735
 
Exercisable at December 31, 2016
  
15
  
$
28.45
   
0.9
  
$
735
 
Summary of Information Concerning Outstanding and Exercisable Stock Options
The following table summarizes information concerning outstanding and exercisable stock options at December 31, 2016:
 
  
Range of Exercise Price
 
(In thousands except life and exercise price)
 
$
26.12 – 30.06
  
$
30.07 – 30.07
 
         
Options outstanding
  
6
   
9
 
Weighted average remaining contractual life, in years
  
0.3
   
1.3
 
Weighted average exercise price
 
$
26.12
  
$
30.07
 
Options exercisable
  
6
   
9
 
Weighted average exercise price
 
$
26.12
  
$
30.07
 
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, 2013
  
497
  
$
38.46
  
$
24,095
 
Granted
  
171
   
55.21
     
Vested
  
(40
)
  
27.15
     
Cancelled
  
(24
)
  
40.84
     
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