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Marketable Securities (Tables)
6 Months Ended
Jun. 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 June 30, 2023
 Cost
Amount
Gross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available-for-sale debt securities$117,727 $— $(11,762)$105,965 
SEI-sponsored mutual funds5,315 206 (29)5,492 
Equities and other mutual funds5,044 290 — 5,334 
$128,086 $496 $(11,791)$116,791 
 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