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WARRANTY (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Product Warranties Disclosures [Abstract]    
Warranty liability, January 1 $ 18,612 $ 17,926
Provision for warranty liabilities 5,231 9,012
Warranty payments made (6,516) (8,326)
Warranty liability, December 31 $ 17,327 $ 18,612