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Employee Benefits (Tables)
 6 Months Ended
Jun. 29, 2013
Employee Benefits [Abstract]  
Schedule of net periodic pension cost
 
 
    Second Quarter
     
    Period from March 31, 2013
to June 29, 2013		   Period from April 1, 2012 to
June 30, 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  
 
    Six Months Ended
         
    Period from December 30,
2012 to June 29, 2013		   Period from January 1,
2012 to June 30, 2012
     
Service cost   $ 1,096     $ 938  
Interest cost on projected benefit obligation     2,375       2,442  
Expected return on plan assets     (2,612 )     (2,448 )
Amortization of unrecognized loss     1,436       1,038  
Net periodic pension cost   $ 2,295     $ 1,970