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Employee Benefits (Tables)
9 Months Ended
Sep. 28, 2013
Employee Benefits [Abstract]  
Schedule of net periodic pension cost
 
  Third Quarter  
 
 
 
Period from June 30, 2013 to
September 28, 2013
   
Period from July 1, 2012 to
September 29, 2012
 
       
Service cost
  $ 548     $ 469  
Interest cost on projected benefit obligation
    1,188       1,221  
Expected return on plan assets
    (1,306 )     (1,224 )
Amortization of unrecognized loss
    718       519  
Net periodic pension cost
  $ 1,148     $ 985  
 
    Nine Months Ended  
 
 
 
Period from December 30,
2012 to September 28, 2013
   
Period from January 1,
2012 to September 29, 2012
 
       
Service cost
  $ 1,644     $ 1,407  
Interest cost on projected benefit obligation
    3,563       3,663  
Expected return on plan assets
    (3,918 )     (3,672 )
Amortization of unrecognized loss
     2,154        1,557  
Net periodic pension cost
  $ 3,443     $ 2,955