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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jun. 25, 2017
Jul. 01, 2018
Jun. 25, 2017
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Retirement plan expenses $ 3,100,000 $ 2,500,000 $ 6,200,000 $ 5,200,000  
Accumulated benefit obligation, defined benefit pension plans 167,000,000   $ 167,000,000   $ 178,200,000
Weighted average duration of defined benefit obligation     30 years 10 months 29 days    
Actuarial loss expected to be recognized in net pension cost, remainder of 2018 $ 600,000   $ 600,000    
Fixed income securities | Pooled separate accounts          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 50.00%   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%   30.00%    
Equity securities | Pooled separate accounts          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 50.00%   50.00%    
Equity securities | Common collective trusts funds          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 70.00%   70.00%    
Pension Benefits          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Expected contributions, remainder of 2018 (less than for other postretirement plans) $ 6,600,000   $ 6,600,000    
Maximum | Other Benefits          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Impact of 0.25% change in discount rate on projected benefit obligation     1,000    
Expected contributions, remainder of 2018 (less than for other postretirement plans) $ 100,000   $ 100,000