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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015 | Dec. 27, 2015 | Dec. 28, 2014
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | $ 96,947 |  |  |
Fair value of plan assets, end of period | $ 103,425 |  | 103,425 |  |  |
Pension Benefits [Member] |  |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation, beginning of period |  |  | 165,952 | $ 190,401 |  |
Interest cost | 1,396 | $ 1,938 | 4,189 | 5,815 |  |
Actuarial losses (gains) |  |  | 12,233 | 981 |  |
Benefits paid |  |  | (7,274) | (4,622) |  |
Curtailments and settlements |  |  | 0 | (14,265) |  |
Projected benefit obligation, end of period | 175,100 | 178,310 | 175,100 | 178,310 |  |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | 96,947 | 113,552 |  |
Actual return on plan assets |  |  | 4,769 | (3,822) |  |
Contributions by employer |  |  | 8,983 | 7,603 |  |
Benefits paid |  |  | (7,274) | (4,622) |  |
Curtailments and settlements |  |  | 0 | (14,265) |  |
Fair value of plan assets, end of period | 103,425 | 98,446 | 103,425 | 98,446 |  |
Funded status: |  |  |  |  |  |
Unfunded benefit obligation, end of period | (71,675) |  | (71,675) |  | $ (69,005) |
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period: |  |  |  |  |  |
Current liability | (10,763) |  | (10,763) |  | (10,779) |
Long-term liability | (60,912) |  | (60,912) |  | (58,226) |
Recognized liability | (71,675) |  | (71,675) |  | (69,005) |
Amounts recognized in accumulated other comprehensive loss at end of period: |  |  |  |  |  |
Net actuarial loss (gain) | 49,026 | 49,558 | 49,026 | 49,558 | 38,115 | $ 43,907
Other Benefits [Member] |  |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation, beginning of period |  |  | 1,672 | 1,657 |  |
Interest cost | 12 | 16 | 38 | 50 |  |
Actuarial losses (gains) |  |  | 95 | (11) |  |
Benefits paid |  |  | (105) | (96) |  |
Curtailments and settlements |  |  | 0 | 0 |  |
Projected benefit obligation, end of period | 1,700 | 1,600 | 1,700 | 1,600 |  |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets, beginning of period |  |  | 0 | 0 |  |
Actual return on plan assets |  |  | 0 | 0 |  |
Contributions by employer |  |  | 105 | 96 |  |
Benefits paid |  |  | (105) | (96) |  |
Curtailments and settlements |  |  | 0 | 0 |  |
Fair value of plan assets, end of period | 0 | 0 | 0 | 0 |  |
Funded status: |  |  |  |  |  |
Unfunded benefit obligation, end of period | (1,700) |  | (1,700) |  | (1,672) |
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period: |  |  |  |  |  |
Current liability | (139) |  | (139) |  | (138) |
Long-term liability | (1,561) |  | (1,561) |  | (1,534) |
Recognized liability | (1,700) |  | (1,700) |  | (1,672) |
Amounts recognized in accumulated other comprehensive loss at end of period: |  |  |  |  |  |
Net actuarial loss (gain) | $ 16 | $ (138) | $ 16 | $ (138) | $ (79) | $ (127)

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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