Employee Benefit Plans Benefit Obligation And Funded Status (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) numberOfParticipants	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Pension Plan [Member]
Change in Benefit Obligation:
Obligation at beginning of period	$ 473,988	$ 521,798
Service cost	5,592	5,646	$ 10,223
Interest cost	22,944	25,852	18,787
Actuarial (gain) loss	(28,499)	3,127
Settlements(1)	(848)	51,942
Benefits paid	(25,230)	(30,493)
Benefit Obligation at End of Period	447,947	473,988	521,798
Change in Fair Value of Plan Assets:
Settlements(1)	(52,700)
Amounts Recognized in the Balance Sheet Consist of:
Noncurrent asset	9,467	7,875
Total Assets	9,467	7,875
Current liability	(10,000)	(11,200)
Noncurrent liability	(52,088)	(67,992)
Total Liabilities	(62,088)	(79,192)
Net amount recognized	(52,621)	(71,317)
Amounts recognized in AOCL consist of:
Prior service cost	0	0
Net actuarial gain	0	0
Total	(31,835)	(44,453)
Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	404,800	427,300
Accumulated benefit obligation	404,800	427,300
Fair value of plan assets	342,700	348,100
Plan Assets used to purchase annuity contract	$ 51,900
Pension Plan, Participants included in Pension Settlement | numberOfParticipants
Settlement loss recognized(1)	$ 0	4,395	0
Pension Plan [Member] | Final settlement reconciliation
Change in Fair Value of Plan Assets:
Settlements(1)	800
Pension Plan [Member] | Pension
Amounts Recognized in Regulatory Assets Consist of:
Prior service credit	0	0
Net actuarial (loss) gain	(31,835)	(44,453)
Pension Plan [Member] | Changes Measurement [Member]
Change in Fair Value of Plan Assets:
Fair value of plan assets at beginning of period	402,671	441,539
Return on plan assets	9,411	34,367
Employer contributions	9,322	9,200
Settlements(1)	(848)	(51,942)
Benefits paid	(25,230)	(30,493)
Fair value of plan assets at end of period	395,326	402,671	441,539
Funded Status	(52,621)	(71,317)
Other Postretirement Benefits Plan [Member]
Change in Benefit Obligation:
Obligation at beginning of period	13,708	15,407
Service cost	308	333
Interest cost	557	674
Actuarial (gain) loss	(2,514)	(1,240)
Settlements(1)	0	0
Benefits paid	(1,333)	(1,466)
Benefit Obligation at End of Period	10,726	13,708	15,407
Amounts Recognized in the Balance Sheet Consist of:
Noncurrent asset	16,943	12,378
Total Assets	16,943	12,378
Current liability	(1,310)	(1,355)
Noncurrent liability	(1,587)	(2,422)
Total Liabilities	(2,897)	(3,777)
Net amount recognized	14,046	8,601
Amounts recognized in AOCL consist of:
Prior service cost	0	0
Net actuarial gain	1,228	(590)
Total	4,944	605
Other Postretirement Benefits Plan [Member] | Pension
Amounts Recognized in Regulatory Assets Consist of:
Prior service credit	0	0
Net actuarial (loss) gain	3,716	15
Other Postretirement Benefits Plan [Member] | Changes Measurement [Member]
Change in Fair Value of Plan Assets:
Fair value of plan assets at beginning of period	22,309	20,055
Return on plan assets	3,177	3,334
Employer contributions	619	386
Settlements(1)	0	0
Benefits paid	(1,333)	(1,466)
Fair value of plan assets at end of period	24,772	22,309	$ 20,055
Funded Status	$ 14,046	$ 8,601