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Product Warranties Product Warranties - Schedule of Product Warranties Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]        
Warranty reserve, beginning of period $ 127,502 $ 111,219 $ 119,638 $ 108,053
Provision 22,789 20,894 66,878 48,992
Payments (20,188) (18,564) (56,413) (43,496)
Warranty reserve, end of period $ 130,103 $ 113,549 $ 130,103 $ 113,549