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WARRANTY (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 14,334 $ 16,327
Provision for warranty liabilities 1,962 1,714
Warranty payments made (2,028) (1,795)
Warranty liability at March 31 $ 14,268 $ 16,246