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Product Warranty Liabilities (Tables)
 6 Months Ended
Jun. 30, 2011
Product Warranty Liabilities (Tables) [Abstract]  
Product Warranty Liabilities
                 
    2010     2011  
Reserve at January 1
  $ 23,814     $ 24,924  
Additions
    9,813       19,213  
Payments
    (9,370 )     (13,648 )
 
           
Reserve at June 30
  $ 24,257     $ 30,489