Benefit Plans - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension and Supplemental Executive Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses (gains)	$ 71,597	$ 78,240
Prior service cost (credit)	2,209	2,555
Total at Year End	73,806	80,795	$ 82,209
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses (gains)	(58,907)	(45,384)
Prior service cost (credit)	2,453	2,923
Total at Year End	$ (56,454)	$ (42,461)	$ (19,763)