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Product Warranties (Tables)
6 Months Ended
Jun. 30, 2012
Product Warranties [Abstract]  
Summary of changes in product warranties reserve
                                 
    Three Months Ended June 30,     Six Months Ended June 30,  
    2012     2011     2012     2011  

Warranty reserve, beginning of period

  $ 60,286     $ 65,330     $ 64,008     $ 69,787  

Provision

    9,302       8,041       15,717       11,773  

Payments

    (10,798     (10,567     (20,935     (18,756
   

 

 

   

 

 

   

 

 

   

 

 

 

Warranty reserve, end of period

  $ 58,790     $ 62,804     $ 58,790     $ 62,804