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Warranty Obligations (Tables)
6 Months Ended
Jul. 01, 2012
Warranty Obligations [Abstract]  
Changes in warranty obligations
         

Balance as of December 31, 2011

  $ 2,097  

Provisions for warranties issued during the period

    971  

Fulfillment of warranty obligations

    (781

Foreign exchange rate changes

    (68
   

 

 

 
   

Balance as of July 1, 2012

  $ 2,219