Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule Of Marketable Securities

			Gross		Gross
(amounts in thousands)	Amortized		Unrealized		Unrealized		Fair
September 30, 2023	Cost		Holding Gains		Holding Losses		Value
Available-for-sale:
Level 1
Equity securities							$	4,370
Level 2
Corporate and municipal bonds	$	172,623	$	1,609	$	(10,168)		164,063
Commercial Paper		50,666		618		—		51,285
Total	$	223,289	$	2,227	$	(10,168)	$	219,718

			Gross		Gross
(amounts in thousands)	Amortized		Unrealized		Unrealized		Fair
December 31, 2022	Cost		Holding Gains		Holding Losses		Value
Available-for-sale:
Level 1
Equity securities							$	5,185
Level 2
Corporate and municipal bonds	$	190,025	$	2,110	$	(10,901)		181,234
Total	$	190,025	$	2,110	$	(10,901)	$	186,419

Schedule Of Maturities Of Marketable Securities

	Amortized		Fair
(amounts in thousands)	Cost		Value
Available-for-sale:
Due within one year	$	88,980	$	89,498
Due after one year through five years		83,664		79,256
Due after five years through ten years		17,957		15,904
Due after ten years		32,688		30,690
Total	$	223,289	$	215,348