Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service credit	$ (1,031)	$ (1,123)
Net actuarial loss	346	971
Income before income taxes	37,707	39,073
Income tax effect	(10,621)	(10,998)
Net income attributable to the Company	26,889	27,737
Reclassification out of Accumulated Other Comprehensive Income | Derivative valuation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Expense/(income) related to interest rate swaps included in Income before taxes	(3,223)	1,696
Income tax effect	815	(430)
Net income attributable to the Company	(2,408)	1,266
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement liability adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service credit	(1,031)	(1,123)
Net actuarial loss	346	971
Income before income taxes	(685)	(152)
Income tax effect	210	47
Net income attributable to the Company	$ (475)	$ (105)