Postretirement Benefits - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amounts recognized in other comprehensive loss
Net actuarial loss arising during the year	$ 26,219	$ 44,509	$ 28,279
Amortization of net actuarial gain	2,519	6,859	15,331
Amortization of prior service cost	(1,688)	(1,611)	(1,446)
Plan amendments	1,935	1,146	583
Settlement gain	572	1,338	0
Total recognized in other comprehensive loss	$ 29,557	$ 52,241	$ 42,747

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Amount, before tax, of 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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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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