Accumulated Other Comprehensive Income ("AOCI") (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense/(income), net related to interest rate swaps included in Income before taxes	$ 3,257	$ 56	$ 5,932	$ (4,910)
Income tax effect	1,282	9,207	22,131	39,908
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income	(18,029)	(27,109)	(69,944)	(80,670)
Amortization of prior service credit	(37)	(1,031)	(113)	(3,092)
Amortization of net actuarial loss	176	349	530	1,042
Total pre-tax amount reclassified	(19,503)	(36,361)	(92,441)	(120,974)
Reclassification out of Accumulated Other Comprehensive Income | Derivative valuation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense/(income), net related to interest rate swaps included in Income before taxes	(2,675)	(3,990)	(10,893)	(10,891)
Income tax effect	658	1,009	2,681	2,755
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income	(2,017)	(2,981)	(8,212)	(8,136)
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement liability adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax effect	(42)	208	(127)	627
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income	97	(474)	290	(1,423)
Amortization of prior service credit	(37)	(1,031)	(113)	(3,092)
Amortization of net actuarial loss	176	349	530	1,042
Total pre-tax amount reclassified	$ 139	$ (682)	$ 417	$ (2,050)