Pensions and Other Postretirement Plans (Accumulated Other Comprehensive Income) (Details 7) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Net amount	$ (388,591)	$ (979,157)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	(524,709)	(1,342,623)
Unrecognized prior service cost	1,676	4,511
Gross amount	(523,033)	(1,338,112)
Deferred tax liability (asset)	145,430	355,078
Net amount	(377,603)	(983,034)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	(2,511)	19,111
Unrecognized prior service cost	0	36
Gross amount	(2,511)	19,147
Deferred tax liability (asset)	230	(5,340)
Net amount	(2,281)	13,807
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	(12,004)	(13,642)
Unrecognized prior service cost	(5)	(12)
Gross amount	(12,009)	(13,654)
Deferred tax liability (asset)	3,302	3,724
Net amount	$ (8,707)	$ (9,930)