Postretirement Benefits - Schedule of Pension Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 658,779	$ 676,788
Qualified Plan \| Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	579,330	597,695
Nonqualified Plan \| SERP
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 79,449	$ 79,093

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