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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Interest cost $ 1,450 $ 2,039
Estimated return on plan assets (2,641) (3,283)
Expenses paid from assets 78 444
Amortization of net loss 565 376
Amortization of past service cost 5 0
Net costs (543) (424)
Other Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Interest cost 5 9
Estimated return on plan assets 0 0
Expenses paid from assets 0 0
Amortization of net loss 1 0
Amortization of past service cost 0 0
Net costs $ 6 $ 9