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Product Warranties (Tables)
3 Months Ended
Mar. 31, 2012
Product Warranties [Abstract]  
Summary of changes in product warranties reserve
                 
    Three Months Ended March 31,  
    2012     2011  

Warranty reserve, beginning of period

  $ 64,008     $ 69,787  

Provision

    6,415       3,732  

Payments

    (10,137     (8,189
   

 

 

   

 

 

 

Warranty reserve, end of period

  $ 60,286     $ 65,330