Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension and SERPA Benefits:
Defined Benefit Plan Disclosure
Service cost	$ 963	$ 1,175	$ 2,889	$ 3,525
Interest cost	20,501	20,118	61,505	60,355
Expected return on plan assets	(32,799)	(33,143)	(98,397)	(99,429)
Amortization of unrecognized: Prior service cost	380	188	1,140	564
Amortization of unrecognized: Net (gain) loss	(174)	(163)	(522)	(489)
Special retirement benefit cost	0	0	0	1,722
Net periodic benefit income	(11,129)	(11,825)	(33,385)	(33,752)
Postretirement Healthcare Benefits:
Defined Benefit Plan Disclosure
Service cost	643	723	1,929	2,169
Interest cost	2,618	2,694	7,854	8,082
Expected return on plan assets	(4,675)	(4,424)	(14,025)	(13,272)
Amortization of unrecognized: Prior service cost	149	149	447	447
Amortization of unrecognized: Net (gain) loss	(1,369)	(1,250)	(4,107)	(3,750)
Net periodic benefit income	$ (2,634)	$ (2,108)	$ (7,902)	$ (6,324)