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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Dec. 27, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Retirement plan expenses $ 1,400 $ 1,600 $ 3,000 $ 6,100  
Weighted average duration of defined benefit obligation     33 years 6 months    
Accumulated benefit obligation, defined benefit pension plans $ 176,900   $ 176,900   $ 166,000
Actuarial gain (loss) expected to be recognized in net pension cost, remainder of 2015     (300)    
Pension Benefits [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Expected contributions, remainder of 2015     7,500    
Other Benefits [Member]          
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 2015     $ 100    
Fixed income securities [Member] | Pooled separate accounts [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations     50.00%    
Fixed income securities [Member] | Common collective trusts funds [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations     30.00%    
Equity securities [Member] | Common collective trusts funds [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations     70.00%