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WARRANTY (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 17,926 $ 23,120
Provision for warranty liabilities 1,864 1,813
Warranty payments made (1,589) (2,790)
Warranty liability at September 30 $ 18,201 $ 22,143