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WARRANTY (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 14,334 $ 16,327
Provision for warranty liabilities 4,060 3,599
Warranty payments made (4,346) (4,969)
Warranty liability at June 30 $ 14,048 $ 14,957