Postretirement Benefits - Schedule of Pension Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 683,397	$ 635,056
Qualified Plan \| Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	609,230	561,615
Nonqualified Plan \| SERP
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 74,167	$ 73,441

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details