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Postretirement Benefits - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amounts included in accumulated other comprehensive income |  |
Net actuarial loss (gain) | $ 26,752 | $ (25,954)
Prior service cost | 11,050 | 11,515
Net amount not yet recognized | $ 37,802 | $ (14,439)

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