Postretirement Benefits - Schedule of Pension Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 630,230	$ 635,056
Qualified Plan \| Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	556,548	561,615
Nonqualified Plan \| SERP
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 73,682	$ 73,441

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant