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Marketable Securities (Tables) | 6 Months Ended
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Jun. 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 June 30, 2023
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 117,727 |  |  | $ | — |  |  | $ | (11,762) |  |  | $ | 105,965 |
SEI-sponsored mutual funds | 5,315 |  |  | 206 |  |  | (29) |  |  | 5,492 |
Equities and other mutual funds | 5,044 |  |  | 290 |  |  | — |  |  | 5,334 |
| $ | 128,086 |  |  | $ | 496 |  |  | $ | (11,791) |  |  | $ | 116,791 |
| 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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