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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 29, 2024
Equity [Abstract] |
Summary of Accumulated Other Comprehensive (Loss) | Following is a summary of AOCI(L) for the first quarter of 2024 and the first quarter of 2023:
(in thousands) |  | December 31, 2023 |  | Pre-tax Activity |  | Tax Effect |  | March 29, 2024
Net pension activity: |  |  |  |  |  |  |  |
Actuarial gain |  | $ | 533 |  |  | $ | — |  |  | $ | — |  |  | $ | 533 |
Prior service costs |  | (97) |  |  | 4 |  |  | (1) |  |  | (94) |
Net postretirement benefits activity: |  |  |  |  |  |  |  |
Actuarial gain |  | 721 |  |  | 26 |  |  | (6) |  |  | 741 |
Prior service costs |  | (624) |  |  | — |  |  | — |  |  | (624) |
Unrealized loss on short-term investments |  | — |  |  | (232) |  |  | 56 |  |  | (176) |
Reclassification of stranded tax effects |  | (4,809) |  |  | — |  |  | — |  |  | (4,809) |
Total AOCI(L) |  | $ | (4,276) |  |  | $ | (202) |  |  | $ | 49 |  |  | $ | (4,429) |
As of December 31, 2023 and March 29, 2024, there were no gross actuarial losses or prior service costs included in accumulated other comprehensive loss associated with the Primary Plan. The Primary Plan settlement, which was completed during 2023, is reflected within the beginning balances above. All pension activity during 2024 was related to the Bargaining Plan.
(in thousands) |  | December 31, 2022 |  | Pre-tax Activity |  | Tax Effect |  | March 31, 2023
Net pension activity: |  |  |  |  |  |  |  |
Actuarial loss |  | $ | (71,140) |  |  | $ | 973 |  |  | $ | (238) |  |  | $ | (70,405) |
Prior service costs |  | (105) |  |  | 4 |  |  | (1) |  |  | (102) |
Net postretirement benefits activity: |  |  |  |  |  |  |  |
Actuarial gain |  | 6,752 |  |  | — |  |  | — |  |  | 6,752 |
Prior service costs |  | (624) |  |  | — |  |  | — |  |  | (624) |
Reclassification of stranded tax effects |  | (19,720) |  |  | — |  |  | — |  |  | (19,720) |
Total AOCI(L) |  | $ | (84,837) |  |  | $ | 977 |  |  | $ | (239) |  |  | $ | (84,099) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
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