Employee Benefit Plans Benefit Obligation And Funded Status (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) numberOfParticipants	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Pension Plan [Member]
Change in Benefit Obligation:
Obligation at beginning of period	$ 521,798	$ 696,802
Service cost	5,646	10,223	$ 12,994
Interest cost	25,852	18,787	18,759
Actuarial loss	3,127	(176,389)
Settlements(1)	(51,942)	0
Benefits paid	(30,493)	(27,625)
Benefit Obligation at End of Period	473,988	521,798	696,802
Change in Fair Value of Plan Assets:
Settlements(1)	(51,900)
Amounts Recognized in the Balance Sheet Consist of:
Noncurrent asset	7,875	7,195
Total Assets	7,875	7,195
Current liability	(11,200)	(11,200)
Noncurrent liability	(67,992)	(76,254)
Total Liabilities	(79,192)	(87,454)
Net amount recognized	(71,317)	(80,259)
Amounts recognized in AOCL consist of:
Prior service cost	0	0
Net actuarial gain	0	0
Total	(44,453)	(54,383)
Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	427,300	474,900
Accumulated benefit obligation	427,300	474,900
Fair value of plan assets	348,100	388,700
Plan Assets used to purchase annuity contract	$ 51,900
Pension Plan, Participants included in Pension Settlement | numberOfParticipants	285
Settlement loss recognized(1)	$ 4,395	0	11,291
Pension Plan [Member] | Pension
Amounts Recognized in Regulatory Assets Consist of:
Prior service credit	0	0
Net actuarial (loss) gain	(44,453)	(54,383)
Pension Plan [Member] | Changes Measurement [Member]
Change in Fair Value of Plan Assets:
Fair value of plan assets at beginning of period	441,539	605,499
Return on plan assets	34,367	(144,535)
Employer contributions	9,200	8,200
Settlements(1)	(51,942)	0
Benefits paid	(30,493)	(27,625)
Fair value of plan assets at end of period	402,671	441,539	605,499
Funded Status	(71,317)	(80,259)
Other Postretirement Benefits Plan [Member]
Change in Benefit Obligation:
Obligation at beginning of period	15,407	17,308
Service cost	333	351
Interest cost	674	358
Actuarial loss	(1,240)	(99)
Settlements(1)	0	0
Benefits paid	(1,466)	(2,511)
Benefit Obligation at End of Period	13,708	15,407	17,308
Amounts Recognized in the Balance Sheet Consist of:
Noncurrent asset	12,378	8,831
Total Assets	12,378	8,831
Current liability	(1,355)	(1,585)
Noncurrent liability	(2,422)	(2,598)
Total Liabilities	(3,777)	(4,183)
Net amount recognized	8,601	4,648
Amounts recognized in AOCL consist of:
Prior service cost	0	0
Net actuarial gain	590	(1,046)
Total	605	(2,193)
Other Postretirement Benefits Plan [Member] | Pension
Amounts Recognized in Regulatory Assets Consist of:
Prior service credit	0	(116)
Net actuarial (loss) gain	15	(3,123)
Other Postretirement Benefits Plan [Member] | Changes Measurement [Member]
Change in Fair Value of Plan Assets:
Fair value of plan assets at beginning of period	20,055	25,289
Return on plan assets	3,334	(4,098)
Employer contributions	386	1,375
Settlements(1)	0	0
Benefits paid	(1,466)	(2,511)
Fair value of plan assets at end of period	22,309	20,055	$ 25,289
Funded Status	$ 8,601	$ 4,648