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WARRANTY (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 16,327 $ 18,612
Provision for warranty liabilities 3,599 5,522
Warranty payments made (4,969) (5,407)
Warranty liability at September 30 $ 14,957 $ 18,727