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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 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 September 30, 2023
 Cost
Amount
Gross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available-for-sale debt securities$123,366 $— $(14,430)$108,936 
SEI-sponsored mutual funds5,412 37 (43)5,406 
Equities and other mutual funds5,033 187 — 5,220 
$133,811 $224 $(14,473)$119,562 
 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