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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2012
Product Warranties [Abstract]  
Summary of activity in the warranty accrual
                                 
    Nine Months ended     Three Months Ended  
(In thousands)   September 29,
2012		     October 1,
2011		     September 29,
2012		     October 1,
2011		  

Balance at beginning of period

   $ 1,092     $ 1,699     $ 1,391     $ 1,390  

Warranties issued

     1,872       1,245       1,100       258  

Warranties settled

     (751 )      (1,759 )      (278 )      (806 ) 

Reassessed warranty exposure

     3       87       3       430  
   

 

 

    

 

 

    

 

 

    

 

 

  

Balance at end of period

   $ 2,216     $ 1,272     $ 2,216     $ 1,272