Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9,243	$ 6,031
Net Periodic Cost (Benefit)	(23,162)	(44,782)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	9,243	6,031
Interest cost	11,534	7,670
Expected return on assets	(38,338)	(41,963)
Amortization of prior service cost (credit)	410	709
Recognized actuarial loss (gain)	(10,140)	(17,229)
Net Periodic Cost (Benefit)	(27,291)	(44,782)
Special separation benefit expense	4,129	0
Net Periodic Cost (Benefit)	(23,162)	(44,782)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	148	228
Interest cost	1,165	822
Amortization of prior service cost (credit)	0	9
Recognized actuarial loss (gain)	0	166
Net Periodic Cost (Benefit)	1,313	1,225
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	22	24
Amortization of prior service cost (credit)	(1)	(2)
Recognized actuarial loss (gain)	(626)	(711)
Net Periodic Cost (Benefit)	$ (605)	$ (689)