Pensions and Other Postretirement Plans (Consolidated Balance Sheet) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	$ 2,113,638	$ 1,658,046
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	2,113,638	1,658,046
Current liability	0	0
Noncurrent liability	0	0
Recognized asset (liability)	2,113,638	1,658,046
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	0	0
Current liability	(6,652)	(6,570)
Noncurrent liability	(83,224)	(83,448)
Recognized asset (liability)	(89,876)	(90,018)
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	(256)	(541)
Noncurrent liability	(993)	(2,859)
Recognized asset (liability)	$ (1,249)	$ (3,400)