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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. 25, 2016 | Sep. 27, 2015 | Dec. 27, 2015
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 | $ (4,838) |  |
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits | $ 5,144 |  |
Pension Benefits [Member] |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 3.91% |  | 4.47%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 4.47% | 4.22% |
Expected return on plan assets | 5.50% | 6.00% |
Other Benefits [Member] |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 3.42% |  | 4.47%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 4.47% | 4.22% |

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