REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Schedule of Revenue Recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Revenue from Contract with Customer [Abstract]
Contract liabilities with customers at beginning of period	$ 3,646	$ 1,275	$ 9,623	$ 7,477
Revenue deferred	150	5,634	4,843	8,671
Revenue recognized	(2,593)	(3,269)	(13,263)	(12,508)
Contract liabilities with customers at end of period	$ 1,203	$ 3,640	$ 1,203	$ 3,640