PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 01, 2018	Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation		$ 61,900	$ 61,900	$ 122,600	$ 117,300
Payments for capital projects				155,188	197,989
Transfer of property, plant and equipment				109,600	159,100
Proceeds from property disposals		200	1,300	1,205	1,466
Gain (loss) on property disposals		(100)	$ 900	(239)	$ 768
Assets held for sale		2,904		2,904		$ 708
Idled assets, carrying amount		49,300		49,300
Idled assets, depreciable value		170,000		170,000
Idled assets, accumulated depreciation		$ 120,700		$ 120,700
U.S. | Reportable Geographical Components
Property, Plant and Equipment [Line Items]
Impairment	$ 500