Retirement Benefits Change in Net Benefit Obligation (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Qualified Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	$ 834,960	$ 849,383
Defined Benefit Plan, Service Cost	19,763	26,888
Defined Benefit Plan, Interest Cost	18,197	22,381
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(1,439)	(6,826)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(37,424)	(55,831)
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt	0	0
Administrative Expense	0	(1,035)
Defined Benefit Plan, Benefit Obligation, Ending Balance	834,057	834,960
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	43,155	46,742
Defined Benefit Plan, Service Cost	418	456
Defined Benefit Plan, Interest Cost	939	1,183
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	828
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(1,485)	(6,054)
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt	0	0
Administrative Expense	0	0
Defined Benefit Plan, Benefit Obligation, Ending Balance	43,027	43,155
Other Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	11,654	12,114
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	205
Defined Benefit Plan, Service Cost	162	155
Defined Benefit Plan, Interest Cost	233	302
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(241)	(514)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(856)	(803)
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt	0	195
Administrative Expense	0	0
Defined Benefit Plan, Benefit Obligation, Ending Balance	10,952	11,654
Qualified Plan [Member] | Qualified Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Nonqualified Plan [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 0	$ 0