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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 |  |
--- | --- | --- | --- | ---
Jul. 01, 2018 | Jun. 25, 2017 | Jul. 01, 2018 | Jun. 25, 2017 | Dec. 31, 2017 | Dec. 25, 2016
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | $ 112,570 |  |  |
Fair value of plan assets, end of period | $ 113,775 |  | 113,775 |  |  |
Pension Benefits |  |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation, beginning of period |  |  | 178,247 | $ 167,159 |  |
Interest cost | 1,365 | $ 1,393 | 2,731 | 2,786 |  |
Actuarial losses (gains) |  |  | (9,465) | 8,885 |  |
Benefits paid |  |  | (4,473) | (4,430) |  |
Projected benefit obligation, end of period | 167,040 | 174,400 | 167,040 | 174,400 |  |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | 112,570 | 97,526 |  |
Actual return on plan assets |  |  | 97 | 7,142 |  |
Contributions by employer |  |  | 5,581 | 4,502 |  |
Benefits paid |  |  | (4,473) | (4,430) |  |
Fair value of plan assets, end of period | 113,775 | 104,740 | 113,775 | 104,740 |  |
Funded status: |  |  |  |  |  |
Unfunded benefit obligation, end of period | (53,265) |  | (53,265) |  | $ (65,677) |
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period: |  |  |  |  |  |
Current liability | (12,159) |  | (12,159) |  | (12,168) |
Long-term liability | (41,106) |  | (41,106) |  | (53,509) |
Recognized liability | (53,265) |  | (53,265) |  | (65,677) |
Amounts recognized in accumulated other comprehensive income (loss) at end of period: |  |  |  |  |  |
Net actuarial loss (gain) | 47,104 | 50,398 | 47,104 | 50,398 | 54,235 | $ 46,494
Other Benefits |  |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation, beginning of period |  |  | 1,603 | 1,648 |  |
Interest cost | 11 | 12 | 23 | 25 |  |
Actuarial losses (gains) |  |  | (62) | 101 |  |
Benefits paid |  |  | (74) | (74) |  |
Projected benefit obligation, end of period | 1,490 | 1,700 | 1,490 | 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 | 74 |  |
Benefits paid |  |  | (74) | (74) |  |
Fair value of plan assets, end of period | 0 | 0 | 0 | 0 |  |
Funded status: |  |  |  |  |  |
Unfunded benefit obligation, end of period | (1,490) |  | (1,490) |  | (1,603) |
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period: |  |  |  |  |  |
Current liability | (148) |  | (148) |  | (149) |
Long-term liability | (1,342) |  | (1,342) |  | (1,454) |
Recognized liability | (1,490) |  | (1,490) |  | (1,603) |
Amounts recognized in accumulated other comprehensive income (loss) at end of period: |  |  |  |  |  |
Net actuarial loss (gain) | $ (27) | $ 70 | $ (27) | $ 70 | $ 35 | $ (31)

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