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Product Warranties (Tables)
9 Months Ended
Sep. 30, 2011
Product Warranties [Abstract] 
Summary of changes in product warranties reserve
                                 
    Three Months Ended
September 30,		     Nine Months Ended
September 30,		  
    2011     2010     2011     2010  

Warranty reserve, beginning of period

   $ 62,804     $ 70,181     $ 69,787     $ 64,417  

Provision

     11,474       6,636       23,247       29,310  

Payments

     (11,110 )      (9,454 )      (29,866 )      (26,364 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Warranty reserve, end of period

   $ 63,168     $ 67,363     $ 63,168     $ 67,363