PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015	Dec. 27, 2015
Property, Plant and Equipment [Abstract]
Depreciation	$ 38,500	$ 34,000
Payments for capital projects	37,074	32,591
Transfer of property, plant and equipment	77,300	45,200
Proceeds from property disposals	610	867
Net gain (loss) on property disposals	129	$ 881
Assets held for sale	6,555		$ 6,555
Idled assets, carrying amount	68,200
Idled assets, depreciable value	198,000
Idled assets, accumulated depreciation	$ 129,800