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Warranty Obligations (Tables)
9 Months Ended
Oct. 02, 2011
Warranty Obligations and Contingencies [Abstract] 
Changes in warranty obligations
         
Balance as of December 31, 2010
  $ 1,985  
Provisions for warranties issued during the period
    1,342  
Fulfillment of warranty obligations
    (1,236 )
Foreign exchange rate changes
    19  
 
     
Balance as of October 2, 2011
  $ 2,110