PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	$ 2,039	$ 1,467
Estimated return on plan assets	(3,283)	(1,349)
Other	444	0
Amortization of net loss	376	328
Net costs	(424)	446
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	9	13
Estimated return on plan assets	0	0
Other	0	0
Amortization of net loss	0	0
Net costs	$ 9	$ 13