PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Depreciation	$ 79,400	$ 65,700	$ 153,900	$ 127,200
Payments for capital projects			148,175	177,609
Transfer of property, plant and equipment			153,600	116,500
Property, Plant and Equipment [Line Items]
Proceeds from property disposals			9,894	1,740
Gain (loss) on property disposals			1,587	(230)
Idled assets, carrying amount	41,800		41,800
Idled assets, depreciable value	222,100		222,100
Idled assets, accumulated depreciation	180,300		180,300
Equipment
Property, Plant and Equipment [Line Items]
Proceeds from property disposals	9,300	1,200	9,900	1,700
Gain (loss) on property disposals	$ 1,100	$ (300)	$ 1,600	$ (200)