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WARRANTY (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 18,612 $ 17,926
Provision for warranty liabilities 1,898 1,864
Warranty payments made (1,336) (1,589)
Warranty liability at March 31 $ 19,174 $ 18,201