Postretirement Benefits - Schedule of Pension and SERP Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
PBO	$ 676,788	$ 635,056
ABO	604,407	568,438
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Funded benefit pension plans PBO	597,695	561,615
Funded benefit pension plans fair value of plan assets	684,279	614,845
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Funded benefit pension plans ABO	531,741	500,010
Funded benefit pension plans fair value of plan assets	684,279	614,845
Qualified Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	597,695	561,615
ABO	531,741	500,010
Nonqualified Plan | SERP
Defined Benefit Plan Disclosure [Line Items]
PBO	79,093	73,441
ABO	$ 72,666	$ 68,428