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. 31, 2019	Apr. 01, 2018	Dec. 30, 2018
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	$ (3,927)
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits	$ 4,124
Pension Benefits
Assumptions used to measure benefit obligation at end of period:
Discount rate	4.15%		4.40%
Assumptions used to measure net pension and other postretirement cost:
Discount rate	4.40%	3.69%
Expected return on plan assets	5.50%	5.50%
Other Benefits
Assumptions used to measure benefit obligation at end of period:
Discount rate	3.80%		4.07%
Assumptions used to measure net pension and other postretirement cost:
Discount rate	4.07%	3.39%