GOODWILL AND IDENTIFIED INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 26,386	$ 18,739	$ 8,500
Expected amortization expense, 2018	24,900
Expected amortization expense, 2019	23,500
Expected amortization expense, 2020	19,700
Expected amortization expense, 2021	19,700
Expected amortization expense, 2022	$ 19,700