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Common Stock and Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 26, 2015
Summary of Stock Options under Equity Plan and Non-Employee Director Plan

Information related to stock options under the Equity Plan and the Non-Employee Director Plan is summarized as follows:

 

     Shares      Weighted-
Average
Exercise
Price		      Weighted-
Average
Remaining
Contractual
Term in
Years		      Aggregate
Intrinsic
Value

 

(in thousands)

  

Outstanding at December 27, 2014

      1,380,444       $ 55.37         

Granted

      24,363         283.22         

Forfeited

      —              

Expired

      —              

Exercised

      (249,436 )       163.02         
  

 

 

     

 

 

     

 

 

     

 

 

  

Outstanding at September 26, 2015

      1,155,371       $ 63.58         3.65       $ 179,584   
  

 

 

     

 

 

     

 

 

     

 

 

  

Exercisable at September 26, 2015

      408,752       $ 61.26         3.35       $ 64,140   
  

 

 

     

 

 

     

 

 

     

 

 

  

Vested and expected to vest at September 26, 2015

      1,118,040       $ 63.54         3.64       $ 173,812   
  

 

 

     

 

 

     

 

 

     

 

 

  
Summary of Vesting Activities of Shares Issued Under Investment Share Program and Restricted Stock Awards

The following table summarizes vesting activities of shares issued under the investment share program and restricted stock awards:

 

     Number of
Shares		      Weighted
Average
Fair
Value		  

Non-vested at December 27, 2014

      73,098       $ 115.99   

Granted

      14,405         195.07   

Vested

      (25,732 )       79.44   

Forfeited

      (817 )       121.36   
  

 

 

     

Non-vested at September 26, 2015

      60,954       $ 150.01