Pensions and Other Postretirement Plans (Total Benefit/Cost) (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32,567	$ 22,991	$ 22,656
Special separation benefit expense			13,781
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Current year actuarial gain (loss)	727,097	(519,595)	(365,164)
Current year prior service cost	0	2	69
Amortization of prior service credit (cost)	(2,864)	(3,170)	(2,680)
Recognized net actuarial gain (loss)	70,833	5,486	(1,219)
Curtailments and settlements	0	120	0
Total Recognized in Other Comprehensive Income (Before Tax Effects)	795,066	(517,157)	(368,994)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	32,567	22,991	22,656
Interest cost	30,504	26,917	32,587
Expected return on assets	(167,485)	(137,878)	(113,427)
Amortization of prior service cost (credit)	2,835	2,846	2,830
Recognized actuarial loss (gain)	(68,656)	(7,906)	0
Net Periodic Cost (Benefit) for the Year	(170,235)	(93,030)	(55,354)
Special separation benefit expense	3,624	1,132	13,781
Total Cost (Benefit) for the Year	(166,611)	(91,898)	(41,573)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Current year actuarial gain (loss)	749,258	(511,373)	(371,621)
Current year prior service cost	0	2	69
Amortization of prior service credit (cost)	(2,835)	(2,846)	(2,830)
Recognized net actuarial gain (loss)	68,656	7,906	0
Total Recognized in Other Comprehensive Income (Before Tax Effects)	815,079	(506,311)	(374,382)
Total Recognized in Total (Benefit) Cost and Other Comprehensive Income (Before Tax Effects)	648,468	(598,209)	(415,955)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	911	1,022	954
Interest cost	3,289	2,943	3,678
Amortization of prior service cost (credit)	36	331	331
Recognized actuarial loss (gain)	666	5,930	5,267
Total Cost (Benefit) for the Year	4,902	10,226	10,230
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Current year actuarial gain (loss)	(20,956)	(7,640)	7,448
Amortization of prior service credit (cost)	(36)	(331)	(331)
Recognized net actuarial gain (loss)	(666)	(5,930)	(5,267)
Total Recognized in Other Comprehensive Income (Before Tax Effects)	(21,658)	(13,901)	1,850
Total Recognized in Total (Benefit) Cost and Other Comprehensive Income (Before Tax Effects)	(16,756)	(3,675)	12,080
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	98	92	167
Amortization of prior service cost (credit)	(7)	(7)	(481)
Recognized actuarial loss (gain)	(2,843)	(3,510)	(4,048)
Net Periodic Cost (Benefit) for the Year	(2,752)	(3,425)	(4,362)
Settlement	0	(120)	0
Total Cost (Benefit) for the Year	(2,752)	(3,545)	(4,362)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Current year actuarial gain (loss)	(1,205)	(582)	(991)
Amortization of prior service credit (cost)	7	7	481
Recognized net actuarial gain (loss)	2,843	3,510	4,048
Curtailments and settlements	0	120	0
Total Recognized in Other Comprehensive Income (Before Tax Effects)	1,645	3,055	3,538
Total Recognized in Total (Benefit) Cost and Other Comprehensive Income (Before Tax Effects)	$ (1,107)	$ (490)	$ (824)