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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 123,366 |  |  | $ | — |  |  | $ | (14,430) |  |  | $ | 108,936 |
SEI-sponsored mutual funds | 5,412 |  |  | 37 |  |  | (43) |  |  | 5,406 |
Equities and other mutual funds | 5,033 |  |  | 187 |  |  | — |  |  | 5,220 |
| $ | 133,811 |  |  | $ | 224 |  |  | $ | (14,473) |  |  | $ | 119,562 |
| At December 31, 2022
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 129,372 |  |  | $ | — |  |  | $ | (12,071) |  |  | $ | 117,301 |
SEI-sponsored mutual funds | 6,207 |  |  | — |  |  | (176) |  |  | 6,031 |
Equities and other mutual funds | 5,026 |  |  | — |  |  | (157) |  |  | 4,869 |
| $ | 140,605 |  |  | $ | — |  |  | $ | (12,404) |  |  | $ | 128,201 |

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