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WARRANTY (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 18,612 $ 17,926
Provision for warranty liabilities 5,522 5,377
Warranty payments made (5,407) (5,693)
Warranty liability at September 30 $ 18,727 $ 17,610