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Warranties - Change in Accruals (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance, beginning of period $ 12,940 $ 11,424 $ 12,652 $ 11,421
Payments made (1,617) (2,071) (2,794) (3,177)
Provisions 1,837 2,313 3,302 3,422
Balance, end of period 13,160 11,666 13,160 11,666
Warranty expense $ 1,837 $ 2,313 $ 3,302 $ 3,422