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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 | 3 Months Ended |
--- | --- | ---
Mar. 26, 2017 | Mar. 27, 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 | $ (4,617) |  |
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits | $ 4,909 |  |
Pension Benefits |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 4.29% |  | 4.31%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 4.31% | 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 | 3.78% |  | 3.81%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 3.81% | 4.47% |

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