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Product Warranty Liabilities (Tables)
6 Months Ended
Jun. 30, 2012
Product Warranty Liabilities and Contingent Liabilities [Abstract]  
Product Warranty Liabilities
                 
    2011     2012  

Reserve at January 1

  $ 24,924     $ 27,400  

Additions

    19,213       13,104  

Payments

    (13,648     (10,134
   

 

 

   

 

 

 

Reserve at June 30

  $ 30,489     $ 30,370