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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2024
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$136,848 $— $(10,663)$126,185 
SEI-sponsored mutual funds30,956 1,271 (5)32,222 
Equities and other mutual funds5,335 285 — 5,620 
$173,139 $1,556 $(10,668)$164,027 
 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)$155,413 
Schedule of Available-for-Sale Debt Securities by Maturity
The following tables provide the scheduled maturities of the Company's available-for-sale debt securities:
At March 31, 2024
CostFair Value
Within one year$— $— 
After one year through five years5,118 4,661 
After 5 years through 10 years20,836 18,811 
After 10 years110,894 102,713 
 $136,848 $126,185 
At December 31, 2023
CostFair Value
Within one year$— $— 
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