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WARRANTY (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 14,334 $ 16,327
Provision for warranty liabilities 3,555 1,722
Warranty payments made (3,784) (2,987)
Warranty liability at June 30 $ 14,105 $ 15,062