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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Economic Assumptions, and Impact of Change in Discount Rate on Benefit Obligation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Net pension and other postretirement cost: |  |  |
Increase in Discount Rate of 0.25% - impact on defined benefit obligation for pension benefits | $ (5,087) |  |
Decrease in Discount Rate of 0.25% - impact on defined benefit obligation for pension benefits | $ 4,828 |  |
Pension Benefits |  |  |
Benefit obligation: |  |  |
Discount rate | 3.69% | 4.31% | 4.47%
Net pension and other postretirement cost: |  |  |
Discount rate | 4.32% | 4.47% | 4.22%
Expected return on plan assets | 5.50% | 5.50% | 5.50%
Other Benefits |  |  |
Benefit obligation: |  |  |
Discount rate | 3.39% | 3.81% | 4.47%
Net pension and other postretirement cost: |  |  |
Discount rate | 3.81% | 4.47% | 4.22%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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