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Warranties - Change in Accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of period $ 13,522 $ 12,652
Payments made (1,464) (1,177)
Provisions 1,467 1,465
Balance, end of period 13,525 12,940
Warranty expense $ 1,467 $ 1,465