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WARRANTY (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 16,327 $ 18,612
Provision for warranty liabilities 1,722 4,213
Warranty payments made (2,987) (3,818)
Warranty liability at June 30 $ 15,062 $ 19,007