Employee Benefit Plans Net Periodic Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plan [Member]
Service cost	$ 5,592	$ 5,646	$ 10,223
Interest cost	22,944	25,852	18,787
Expected return on plan assets	25,325	25,932	24,173
Amortization of prior service cost (credit)	0	0	0
Recognized actuarial loss (gain)	(33)	(228)	(383)
Settlement loss recognized(1)	0	4,395	0
Net Periodic Benefit Cost (Credit)	3,244	10,189	5,220
Regulatory deferral of net periodic benefit cost(2)	4,850	(1,814)	2,307
Previously deferred costs recognized(2)	75	210	0
Net Periodic Benefit Cost (Credit) Recognized	8,169	8,585	7,527
Other Pension, Postretirement and Supplemental Plans [Member]
Service cost	308	333	351
Interest cost	557	674	359
Expected return on plan assets	1,280	1,096	1,047
Amortization of prior service cost (credit)	0	116	(1,891)
Recognized actuarial loss (gain)	73	672	897
Settlement loss recognized(1)	0	0	0
Net Periodic Benefit Cost (Credit)	(488)	(645)	(3,125)
Regulatory deferral of net periodic benefit cost(2)	0	0	0
Previously deferred costs recognized(2)	181	550	292
Net Periodic Benefit Cost (Credit) Recognized	$ (307)	$ (95)	$ (2,833)