Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14,761	$ 8,490	$ 42,866	$ 25,306
Net Periodic Cost (Benefit)			(64,532)	(73,852)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	14,761	8,490	42,866	25,306
Interest cost	11,220	11,559	33,660	34,652
Expected return on assets	(41,487)	(38,351)	(124,416)	(114,774)
Amortization of prior service cost (credit)	(487)	412	(1,463)	1,234
Recognized actuarial loss (gain)	(11,891)	(9,888)	(35,672)	(29,916)
Net Periodic Cost (Benefit)	(27,884)	(27,778)	(85,025)	(83,498)
Early retirement programs and special separation benefit expense	3,665	0	20,493	9,646
Net Periodic Cost (Benefit)	(24,219)	(27,778)	(64,532)	(73,852)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	287	148	862	444
Interest cost	1,128	1,164	3,385	3,494
Net Periodic Cost (Benefit)	1,415	1,312	4,247	3,938
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	14	38	42	112
Amortization of prior service cost (credit)	0	(2)	0	(4)
Recognized actuarial loss (gain)	(469)	(585)	(1,408)	(1,757)
Net Periodic Cost (Benefit)	$ (455)	$ (549)	$ (1,366)	$ (1,649)