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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. 27, 2016
Mar. 29, 2015
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Interest cost $ 1,396 $ 1,938
Estimated return on plan assets (1,314) (1,671)
Settlement loss 0 3,062
Amortization of net loss 165 179
Net costs 247 3,508
Other Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Interest cost 12 17
Estimated return on plan assets 0 0
Settlement loss 0 0
Amortization of net loss 0 0
Net costs $ 12 $ 17