PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Property, Plant and Equipment [Abstract]
Depreciation	$ 89,900	$ 79,400	$ 170,600	$ 153,900
Payments for capital projects			183,744	148,175
Transfer of property, plant and equipment			129,400	153,600
Proceeds from property disposals	8,300	9,300	21,385	9,894
Gains on property disposals	2,700	$ 1,100	5,057	$ 1,587
Idled assets, carrying amount	43,300		43,300
Idled assets, depreciable value	206,200		206,200
Idled assets, accumulated depreciation	$ 162,900		$ 162,900