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Employee Benefits (Tables)
 3 Months Ended
Mar. 30, 2013
Employee Benefits [Abstract]  
Schedule of net periodic pension cost
 
    First Quarter  
             
   
Period from December 30,
2012 to March 30, 2013
    
Period from January 1, 2012
to March 31, 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