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WARRANTY (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 18,612 $ 17,926
Provision for warranty liabilities 4,213 3,112
Warranty payments made (3,818) (3,378)
Warranty liability at June 30 $ 19,007 $ 17,660