GOODWILL AND INTANGIBLE ASSETS - Other Intangible Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Intangible Assets [Roll Forward]
Balance - December 31, 2015			$ 106,759
Acquisitions			53,937
Amortization	$ (3,687)	$ (2,354)	(9,680)	$ (5,995)
Other			(170)
Balance - September 25, 2016	150,846		150,846
Manufacturing [Member]
Intangible Assets [Roll Forward]
Balance - December 31, 2015			95,359
Acquisitions			48,407
Amortization			(7,639)
Other			(170)
Balance - September 25, 2016	135,957		135,957
Distribution [Member]
Intangible Assets [Roll Forward]
Balance - December 31, 2015			11,400
Acquisitions			5,530
Amortization			(2,041)
Other			0
Balance - September 25, 2016	$ 14,889		$ 14,889