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Investments In Securities and Fair Value (Schedule Of Gross Realized and Unrealized Gains And Losses On Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Marketable Security, Gain (Loss) [Abstract]
Equity securities, realized gains	$ 1,749	$ 2,564	$ 15,449	$ 7,120
Debit and equity securities, realized gains	1,749	2,564	15,449	7,120
Debt Securities, Available-for-sale, Realized Loss	0	(58)	0	(104)
Equity securities, realized losses	(77)	(20)	(400)	(209)
Write-down of securities	(96)	(35)	(208)	(162)
Debt and Equity Securities, Realized Loss	(173)	(113)	(608)	(475)
Debt and equity securities, net realized gain (loss)	1,576	2,451	14,841	6,645
Gains On Other Assets and Investments	5	30	5	30
Gross losses on sales of other investments	(4)	0	(120)	(409)
Net gains (losses) on sales of other investments	1	30	(115)	(379)
Net realized investment gains (losses)	1,577	2,481	14,726	6,266
Unrealized Gain (Loss) on Investments	(2,392)	(4,635)	(14,006)	(22,722)
Gain (Loss) on Investments	$ (815)	$ (2,154)	$ 720	$ (16,456)

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