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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 25, 2017 | Jun. 26, 2016 | Jun. 25, 2017 | Jun. 26, 2016 | Dec. 25, 2016 | Dec. 27, 2015
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | $ 97,526 |  |  |
Fair value of plan assets, end of period | $ 104,740 |  | 104,740 |  |  |
Pension Benefits |  |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation, beginning of period |  |  | 167,159 | $ 165,952 |  |
Interest cost | 1,393 | $ 1,397 | 2,786 | 2,793 |  |
Actuarial losses (gains) |  |  | 8,885 | 12,736 |  |
Benefits paid |  |  | (4,430) | (4,581) |  |
Projected benefit obligation, end of period | 174,400 | 176,900 | 174,400 | 176,900 |  |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | 97,526 | 96,947 |  |
Actual return on plan assets |  |  | 7,142 | 1,084 |  |
Contributions by employer |  |  | 4,502 | 4,412 |  |
Benefits paid |  |  | (4,430) | (4,581) |  |
Fair value of plan assets, end of period | 104,740 | 97,862 | 104,740 | 97,862 |  |
Funded status: |  |  |  |  |  |
Unfunded benefit obligation, end of period | (69,660) |  | (69,660) |  | $ (69,633) |
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period: |  |  |  |  |  |
Current liability | (13,103) |  | (13,103) |  | (13,113) |
Long-term liability | (56,557) |  | (56,557) |  | (56,520) |
Recognized liability | (69,660) |  | (69,660) |  | (69,633) |
Amounts recognized in accumulated other comprehensive loss at end of period: |  |  |  |  |  |
Net actuarial loss (gain) | 50,398 | 52,065 | 50,398 | 52,065 | 46,494 | $ 38,115
Other Benefits |  |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation, beginning of period |  |  | 1,648 | 1,672 |  |
Interest cost | 12 | 14 | 25 | 26 |  |
Actuarial losses (gains) |  |  | 101 | 72 |  |
Benefits paid |  |  | (74) | (70) |  |
Projected benefit obligation, end of period | 1,700 | 1,700 | 1,700 | 1,700 |  |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | 0 | 0 |  |
Actual return on plan assets |  |  | 0 | 0 |  |
Contributions by employer |  |  | 74 | 70 |  |
Benefits paid |  |  | (74) | (70) |  |
Fair value of plan assets, end of period | 0 | 0 | 0 | 0 |  |
Funded status: |  |  |  |  |  |
Unfunded benefit obligation, end of period | (1,700) |  | (1,700) |  | (1,648) |
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period: |  |  |  |  |  |
Current liability | (147) |  | (147) |  | (147) |
Long-term liability | (1,553) |  | (1,553) |  | (1,501) |
Recognized liability | (1,700) |  | (1,700) |  | (1,648) |
Amounts recognized in accumulated other comprehensive loss at end of period: |  |  |  |  |  |
Net actuarial loss (gain) | $ 70 | $ (7) | $ 70 | $ (7) | $ (31) | $ (79)

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