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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2022
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 December 31, 2022
 CostGross
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 
 At December 31, 2021
 CostGross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available for sale debt securities$117,215 $— $(80)$117,135 
SEI-sponsored mutual funds6,748 463 — 7,211 
Equities and other mutual funds4,935 260 — 5,195 
$128,898 $723 $(80)$129,541