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WARRANTY LIABILITIES (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Warranty liability activity [Roll Forward]    
Beginning balance $ 19,405 $ 15,421
Settlements in cash or kind (5,566) (3,838)
Warranties issued and adjustments to preexisting warranties 5,652 4,674
Ending balance $ 19,491 $ 16,257