Employee Benefit Plans Benefit Obligation And Funded Status (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) numberOfParticipants	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Pension Plan [Member]
Change in Benefit Obligation:
Obligation at beginning of period	$ 696,802	$ 820,979
Service cost	10,223	12,994	$ 11,116
Interest cost	18,787	18,759	22,840
Actuarial loss	(176,389)	(28,905)
Settlements(1)	0	93,488
Benefits paid	(27,625)	(33,537)
Benefit Obligation at End of Period	521,798	696,802	820,979
Change in Fair Value of Plan Assets:
Settlements(1)	(93,500)
Amounts Recognized in the Balance Sheet Consist of:
Noncurrent asset	7,195	8,297
Total Assets	7,195	8,297
Current liability	(11,200)	(11,200)
Noncurrent liability	(76,254)	(88,400)
Total Liabilities	(87,454)	(99,600)
Net amount recognized	(80,259)	(91,303)
Amounts recognized in AOCL consist of:
Prior service cost	0	0
Net actuarial gain	0	0
Total	(54,383)	(62,448)
Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	474,900	636,300
Accumulated benefit obligation	474,900	636,300
Fair value of plan assets	388,700	537,900
Plan Assets used to purchase annuity contract	$ 93,500
Pension Plan, Participants included in Pension Settlement | numberOfParticipants	1,062
Settlement loss recognized(1)	$ 0	11,291	0
Pension Plan [Member] | Pension
Amounts Recognized in Regulatory Assets Consist of:
Prior service credit	0	0
Net actuarial loss	(54,383)	(62,448)
Pension Plan [Member] | Changes Measurement [Member]
Change in Fair Value of Plan Assets:
Fair value of plan assets at beginning of period	605,499	688,456
Return on plan assets	(144,535)	33,868
Employer contributions	8,200	10,200
Settlements(1)	0	(93,488)
Benefits paid	(27,625)	(33,537)
Fair value of plan assets at end of period	441,539	605,499	688,456
Funded Status	(80,259)	(91,303)
Other Postretirement Benefits Plan [Member]
Change in Benefit Obligation:
Obligation at beginning of period	17,308	19,146
Service cost	351	407
Interest cost	358	317
Actuarial loss	(99)	415
Settlements(1)	0	0
Benefits paid	(2,511)	(2,977)
Benefit Obligation at End of Period	15,407	17,308	19,146
Amounts Recognized in the Balance Sheet Consist of:
Noncurrent asset	8,831	11,914
Total Assets	8,831	11,914
Current liability	(1,585)	(1,575)
Noncurrent liability	(2,598)	(2,358)
Total Liabilities	(4,183)	(3,933)
Net amount recognized	4,648	7,981
Amounts recognized in AOCL consist of:
Prior service cost	0	(95)
Net actuarial gain	1,046	(2,500)
Total	(2,193)	5,641
Other Postretirement Benefits Plan [Member] | Pension
Amounts Recognized in Regulatory Assets Consist of:
Prior service credit	(116)	1,870
Net actuarial loss	(3,123)	1,366
Other Postretirement Benefits Plan [Member] | Changes Measurement [Member]
Change in Fair Value of Plan Assets:
Fair value of plan assets at beginning of period	25,289	23,096
Return on plan assets	(4,098)	3,349
Employer contributions	1,375	1,821
Settlements(1)	0	0
Benefits paid	(2,511)	(2,977)
Fair value of plan assets at end of period	20,055	25,289	$ 23,096
Funded Status	$ 4,648	$ 7,981