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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 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 December 31, 2022
|  | Cost |  | 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 |
|  | At December 31, 2021
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available for sale debt securities |  | $ | 117,215 |  |  | $ | — |  |  | $ | (80) |  |  | $ | 117,135 |
SEI-sponsored mutual funds |  | 6,748 |  |  | 463 |  |  | — |  |  | 7,211 |
Equities and other mutual funds |  | 4,935 |  |  | 260 |  |  | — |  |  | 5,195 |
|  | $ | 128,898 |  |  | $ | 723 |  |  | $ | (80) |  |  | $ | 129,541 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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