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Marketable Securities (Tables)
6 Months Ended
Jun. 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 June 30, 2022
 Cost
Amount
Gross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available-for-sale debt securities$119,702 $— $(8,832)$110,870 
SEI-sponsored mutual funds6,271 — (249)6,022 
Equities and other mutual funds4,870 — (80)4,790 
$130,843 $— $(9,161)$121,682 
 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