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)

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before 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.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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