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Warranty Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]      
Balance — January 1 $ 30,854 $ 32,033 $ 33,601
Accruals for warranty expense, net of adjustments 21,701 26,215 28,454
Settlements made (24,611) (27,394) (30,022)
Balance — December 31 $ 27,944 $ 30,854 $ 32,033