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WARRANTY (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 17,926 $ 23,120
Provision for warranty liabilities 5,377 4,950
Warranty payments made (5,693) (8,882)
Warranty liability at September 30 $ 17,610 $ 19,188