Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,573	$ 4,993	$ 16,816	$ 11,024
Net Periodic Cost (Benefit)			(46,074)	(90,971)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7,573	4,993	16,816	11,024
Interest cost	11,559	7,611	23,093	15,281
Expected return on assets	(38,085)	(41,963)	(76,423)	(83,926)
Amortization of prior service cost (credit)	412	709	822	1,418
Recognized actuarial loss (gain)	(9,888)	(17,539)	(20,028)	(34,768)
Net Periodic Cost (Benefit)	(28,429)	(46,189)	(55,720)	(90,971)
Special separation benefit expense	5,517	0	9,646	0
Net Periodic Cost (Benefit)	(22,912)	(46,189)	(46,074)	(90,971)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	148	228	296	456
Interest cost	1,165	822	2,330	1,644
Amortization of prior service cost (credit)	0	9	0	18
Recognized actuarial loss (gain)	0	167	0	333
Net Periodic Cost (Benefit)	1,313	1,226	2,626	2,451
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	52	25	74	49
Amortization of prior service cost (credit)	(1)	(2)	(2)	(4)
Recognized actuarial loss (gain)	(546)	(710)	(1,172)	(1,421)
Net Periodic Cost (Benefit)	$ (495)	$ (687)	$ (1,100)	$ (1,376)