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Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2011
Product Warranties [Abstract]  
Schedule Of Changes In The Warranty Reserve
     December 31  

(Dollars in thousands)

   2011     2010  

Beginning Balance

    $ 1,340      $ 1,140   

Payments and replacement product

      (440 )      (272 ) 

Additions to warranty reserve for warranties issued during the period

      725        480   

Change in the warranty reserve for pre-existing warranties

      (1 )      (8 ) 
  

 

 

    

 

 

  

Ending Balance

    $ 1,624      $ 1,340