Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14,071	$ 7,573	$ 28,105	$ 16,816
Net Periodic Cost (Benefit)			(40,313)	(46,074)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	14,071	7,573	28,105	16,816
Interest cost	11,246	11,559	22,440	23,093
Expected return on assets	(41,239)	(38,085)	(82,929)	(76,423)
Amortization of prior service cost (credit)	(482)	412	(976)	822
Recognized actuarial loss (gain)	(11,263)	(9,888)	(23,781)	(20,028)
Net Periodic Cost (Benefit)	(27,667)	(28,429)	(57,141)	(55,720)
Early retirement programs and special separation benefit expense	16,410	5,517	16,828	9,646
Net Periodic Cost (Benefit)	(11,257)	(22,912)	(40,313)	(46,074)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	288	148	575	296
Interest cost	1,129	1,165	2,257	2,330
Net Periodic Cost (Benefit)	1,417	1,313	2,832	2,626
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	14	52	28	74
Amortization of prior service cost (credit)	0	(1)	0	(2)
Recognized actuarial loss (gain)	(470)	(546)	(939)	(1,172)
Net Periodic Cost (Benefit)	$ (456)	$ (495)	$ (911)	$ (1,100)