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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2023
Marketable Securities [Abstract]  
Schedule of Available For Sale and Equity Securities
Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: 
 At March 31, 2023
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$123,288 $— $(10,353)$112,935 
SEI-sponsored mutual funds6,216 89 (34)6,271 
Equities and other mutual funds5,057 6 — 5,063 
$134,561 $95 $(10,387)$124,269 
 At December 31, 2022
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$129,372 $— $(12,071)$117,301 
SEI-sponsored mutual funds6,207 — (176)6,031 
Equities and other mutual funds5,026 — (157)4,869 
$140,605 $— $(12,404)$128,201