PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2017	Mar. 27, 2016	Dec. 25, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 45,800	$ 38,500
Payments for capital projects	114,487	37,074
Transfer of property, plant and equipment	47,500	77,300
Proceeds from property disposals	181	610
Net gain (loss) on property disposals	(118)	$ 129
Assets held for sale	5,015		$ 5,259
Idled assets, carrying amount	59,000
Idled assets, depreciable value	191,700
Idled assets, accumulated depreciation	$ 132,700