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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 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 September 30, 2022
 Cost
Amount
Gross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available-for-sale debt securities$113,155 $— $(13,919)$99,236 
SEI-sponsored mutual funds6,197 — (745)5,452 
Equities and other mutual funds5,030 — (343)4,687 
$124,382 $— $(15,007)$109,375 
 At December 31, 2021
 Cost
Amount
Gross
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