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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Stock-Based Compensation [Abstract]  
Weighted average assumptions used in calculating fair value of stock options
The weighted average of key assumptions used in determining the fair value of options granted and a discussion of the methodology used to develop each assumption are as follows:
 
 
 
2016
 
 
2015
 
 
2014
 
 
 
 
 
 
 
 
 
 
 
Expected term
 
6.7 years
 
 
5.5 years
 
 
5.6 years
 
Expected price volatility
 
 
25.6%
 
 
 
26.2%
 
 
 
34.3%
 
Risk-free interest rate
 
 
1.6%
 
 
 
1.7%
 
 
 
1.7%
 
Dividend yield
 
 
1.0%
 
 
 
0.9%
 
 
 
1.0%
 
Summary of the stock option activity
A summary of the activity and related information follows:

  
Stock Options
  
Restricted Stock Awards
 
 
(Shares in thousands)
 
Shares
  
Weighted Average Exercise Price
  
Shares
  
Weighted Average Grant Date Fair Value
 
             
Outstanding at December 26, 2015
  
1,198
  
$
20.59
   
705
  
$
28.08
 
Granted
  
24
   
30.86
   
265
   
34.04
 
Exercised
  
(178
)
  
17.61
   
(188
)
  
25.23
 
Forfeited
  
(10
)
  
30.79
   
(73
)
  
28.53
 
                 
Outstanding at December 31, 2016
  
1,034
   
21.24
   
709
   
31.02