Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (income) expense	$ 3,106	$ 3,933	$ 6,396	$ 7,542
Prior service credit	(1,030)	(1,122)	(2,061)	(2,245)
Net actuarial loss	347	967	693	1,938
Income before income taxes	46,906	53,827	84,613	92,900
Income tax effect	(20,080)	(14,458)	(30,701)	(25,456)
Net income attributable to the Company	26,672	39,201	53,561	66,938
Reclassification out of Accumulated Other Comprehensive Income | Derivative valuation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (income) expense	(3,678)	1,168	(6,901)	2,864
Income tax effect	931	(295)	1,746	(725)
Net income attributable to the Company	(2,747)	873	(5,155)	2,139
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	(1,030)	(1,122)	(2,061)	(2,245)
Net actuarial loss	347	967	693	1,938
Income before income taxes	(683)	(155)	(1,368)	(307)
Income tax effect	209	47	419	94
Net income attributable to the Company	$ (474)	$ (108)	$ (949)	$ (213)