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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 | 9 Months Ended |
--- | --- | ---
Sep. 24, 2017 | Sep. 25, 2016 | Dec. 25, 2016
Assumptions used to measure net pension and other postretirement cost: |  |  |
Increase in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits | $ (4,786) |  |
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits | $ 5,088 |  |
Pension Benefits |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 3.87% |  | 4.31%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 4.32% | 4.47% |
Expected return on plan assets | 5.50% | 5.50% |
Other Benefits |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 3.41% |  | 3.81%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 3.81% | 4.47% |

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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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