PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Economic Assumptions and Impact of Change in Discount Rate on Benefit Obligation) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Dec. 29, 2019
Assumptions used to measure net pension and other postretirement cost:
Increase in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits	$ (8,777)
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits	$ 9,240
Pension Benefits
Assumptions used to measure benefit obligation at end of period:
Discount rate	2.91%		2.56%
Assumptions used to measure net pension and other postretirement cost:
Discount rate	2.72%	4.40%
Expected return on plan assets	2.31%	5.50%
Other Benefits
Assumptions used to measure benefit obligation at end of period:
Discount rate	2.77%		2.77%
Assumptions used to measure net pension and other postretirement cost:
Discount rate	2.77%	4.07%