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PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Unrecognized Benefit Amounts (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 29, 2019 | Sep. 30, 2018
Pension Benefits |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Net actuarial loss (gain), beginning of period | $ 54,343 | $ 54,235
Amortization | (984) | (902)
Curtailment and settlement adjustments | (3,064) | 0
Actuarial loss (gain) | 20,726 | (9,787)
Asset loss (gain) | (8,590) | 2,695
Net actuarial loss (gain), end of period | 62,431 | 46,241
Other Benefits |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Net actuarial loss (gain), beginning of period | (34) | 35
Amortization | 0 | 0
Curtailment and settlement adjustments | 0 | 0
Actuarial loss (gain) | 129 | (67)
Asset loss (gain) | 0 | 0
Net actuarial loss (gain), end of period | $ 95 | $ (32)

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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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