Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,490	$ 5,557	$ 25,306	$ 16,581
Net Periodic Cost (Benefit)			(73,852)	(136,411)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	8,490	5,557	25,306	16,581
Interest cost	11,559	7,612	34,652	22,893
Expected return on assets	(38,351)	(41,779)	(114,774)	(125,705)
Amortization of prior service cost (credit)	412	708	1,234	2,126
Recognized actuarial loss (gain)	(9,888)	(17,538)	(29,916)	(52,306)
Net Periodic Cost (Benefit)	(27,778)	(45,440)	(83,498)	(136,411)
Special separation benefit expense	0	0	9,646	0
Net Periodic Cost (Benefit)	(27,778)	(45,440)	(73,852)	(136,411)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	148	227	444	683
Interest cost	1,164	823	3,494	2,467
Amortization of prior service cost (credit)	0	9	0	27
Recognized actuarial loss (gain)	0	166	0	499
Net Periodic Cost (Benefit)	1,312	1,225	3,938	3,676
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	38	24	112	73
Amortization of prior service cost (credit)	(2)	(1)	(4)	(5)
Recognized actuarial loss (gain)	(585)	(711)	(1,757)	(2,132)
Net Periodic Cost (Benefit)	$ (549)	$ (688)	$ (1,649)	$ (2,064)