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Employee Benefit Plans
9 Months Ended
Oct. 01, 2011
Employee Benefit Plans [Abstract] 
Employee Benefit Plans
5. Employee Benefit Plans
Components of other postretirement benefit cost:
                                 
    Three Months     Nine Months  
    Ended     Ended  
    October 1,     October 2,     October 1,     October 2,  
    2011     2010     2011     2010  
Interest cost
  $ 36     $ 47     $ 115     $ 140  
Amortization of prior service cost
    (48 )     (39 )     (133 )     (115 )
Amortization of accumulated loss
    (2 )     18       15       54  
 
                       
Net periodic postretirement benefit cost
  $ (14 )   $ 26     $ (3 )   $ 79