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WARRANTY (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 15,040 $ 14,334
Provision for warranty liabilities 5,747 3,555
Warranty payments made (4,795) (3,784)
Warranty liability at June 30 $ 15,992 $ 14,105