PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation		$ 64,400	$ 63,800	$ 187,000	$ 181,100
Payments for capital projects				231,875	258,364
Transfer of property, plant and equipment				149,500	272,500
Proceeds from property disposals		1,500	1,000	2,707	2,585
Gain (loss) on property disposals		700	$ (200)	452	$ 540
Assets held for sale	$ 2,616	2,616		2,616		$ 708
Idled assets, carrying amount	47,400	47,400		47,400
Idled assets, depreciable value	155,600	155,600		155,600
Idled assets, accumulated depreciation	108,200	$ 108,200		108,200
Idled assets, impairment				$ 100
U.S. | Reportable Geographical Components
Property, Plant and Equipment [Line Items]
Impairment	$ 800