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Warranties (Tables)
 6 Months Ended
Jun. 30, 2012
Warranties [Abstract]  
Components of the warranty accrual
                                 
    Three Months Ended     Six Months Ended  
    June 30,
2012		     July 2,
2011		     June 30,
2012		     July 2,
2011		  

Balance as of beginning of period

   $ 4,923     $ 3,725     $ 4,797     $ 3,129  

Accruals for warranties issued during period

     1,192       1,291       2,664       2,537  

Aggregate changes in liabilities related to preexisting warranties

     548       788       1,158       1,826  

Settlements during the period

     (1,720 )      (1,562 )      (3,676 )      (3,250 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Balance as of end of period

   $ 4,943     $ 4,242     $ 4,943     $ 4,242