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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 26, 2017
Mar. 27, 2016
Dec. 25, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Retirement plan expenses $ 1,600 $ 1,600  
Accumulated benefit obligation, defined benefit pension plans $ 167,100   $ 167,200
Weighted average duration of defined benefit obligation 32 years 3 months 22 days    
Actuarial gain (loss) expected to be recognized in net pension cost, remainder of 2015 $ (700)    
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Expected contributions, remainder of 2016 (less than for other postretirement plans) 8,700    
Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Impact of 0.25% change in discount rate on projected benefit obligation 1    
Expected contributions, remainder of 2016 (less than for other postretirement plans) $ 100    
Fixed income securities | Pooled separate accounts      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Fixed income securities | Common collective trusts funds      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 30.00%    
Equity securities | Common collective trusts funds      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 70.00%