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WARRANTY (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Product Warranty Liability [Line Items]    
Warranty liability at January 1 $ 17,926 $ 23,120
Provision for warranty liabilities 3,112 3,373
Warranty payments made (3,378) (6,205)
Warranty liability at June 30 $ 17,660 $ 20,288