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Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2024
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, 2024
 Cost
Amount
Gross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available-for-sale debt securities$149,579 $— $(11,536)$138,043 
SEI-sponsored mutual funds31,665 1,533 (3)33,195 
Equities and other mutual funds5,366 345 — 5,711 
$186,610 $1,878 $(11,539)$176,949 
 At December 31, 2023
 Cost
Amount
Gross
Unrealized
Gains
Gross
Unrealized
(Losses)
Fair
Value
Available-for-sale debt securities$127,681 $— $(8,929)$118,752 
SEI-sponsored mutual funds30,427 818 (19)31,226 
Equities and other mutual funds5,301 134 — 5,435 
$163,409 $952 $(8,948)$155,413 
Schedule of Available-for-Sale Debt Securities by Maturity
The following tables provide the scheduled maturities of the Company's available-for-sale debt securities:
At June 30, 2024
CostFair Value
Within one year$— $— 
After one year through five years5,176 4,708 
After 5 years through 10 years18,888 17,078 
After 10 years125,515 116,257 
 $149,579 $138,043 
At December 31, 2023
CostFair Value
Within one year$— $— 
After one year through five years5,679 5,035 
After 5 years through 10 years31,162 28,084 
After 10 years90,840 85,633 
 $127,681 $118,752