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Warranties - Change in Accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of period $ 12,652 $ 11,421
Payments made (1,177) (1,106)
Provisions 1,465 1,109
Balance, end of period 12,940 11,424
Warranty expense $ 1,465 $ 1,109