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WARRANTY (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 15,040 $ 14,334
Provision for warranty liabilities 7,397 4,060
Warranty payments made (6,039) (4,346)
Warranty liability at June 30 $ 16,398 $ 14,048