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Employee Benefit Plans
6 Months Ended
Jul. 02, 2011
Employee Benefit Plans [Abstract]  
Employee Benefit Plans
5. Employee Benefit Plans
Components of other postretirement benefit cost:
                                 
    Three Months     Six Months  
    Ended     Ended  
    July 2,     July 3,     July 2,     July 3,  
    2011     2010     2011     2010  
Interest cost
  $ 39     $ 47     $ 79     $ 94  
Amortization of prior service cost
    (43 )     (38 )     (85 )     (76 )
Amortization of accumulated loss
    9       18       17       36  
 
                       
Net periodic postretirement benefit cost
  $ 5     $ 27     $ 11     $ 54