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Warranty Obligations (Tables)
3 Months Ended
Apr. 01, 2012
Warranty Obligations and Contingencies [Abstract]  
Changes in warranty obligations
         

Balance as of December 31, 2011

  $ 2,097  

Provisions for warranties issued during the period

    403  

Fulfillment of warranty obligations

    (426

Foreign exchange rate changes

    50  
   

 

 

 

Balance as of April 1, 2012

  $ 2,124