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Accumulated Other Comprehensive Income (Loss) (Tables)
3 Months Ended
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, 2023Pre-tax ActivityTax EffectMarch 29, 2024
Net pension activity:
Actuarial gain$533 $— $— $533 
Prior service costs(97)(1)(94)
Net postretirement benefits activity:
Actuarial gain721 26 (6)741 
Prior service costs(624)— — (624)
Unrealized loss on short-term investments— (232)56 (176)
Reclassification of stranded tax effects(4,809)— — (4,809)
Total AOCI(L)$(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, 2022Pre-tax ActivityTax EffectMarch 31, 2023
Net pension activity:
Actuarial loss$(71,140)$973 $(238)$(70,405)
Prior service costs(105)(1)(102)
Net postretirement benefits activity:
Actuarial gain6,752 — — 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)