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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available for sale debt securities |  | $ | 91,262 |  |  | $ | 2,015 |  |  | $ | — |  |  | $ | 93,277 |
SEI-sponsored mutual funds |  | 6,866 |  |  | 382 |  |  | — |  |  | 7,248 |
Equities and other mutual funds |  | 4,421 |  |  | 473 |  |  | — |  |  | 4,894 |
|  | $ | 102,549 |  |  | $ | 2,870 |  |  | $ | — |  |  | $ | 105,419 |
|  | At December 31, 2019
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available for sale debt securities |  | $ | 104,193 |  |  | $ | 605 |  |  | $ | — |  |  | $ | 104,798 |
SEI-sponsored mutual funds |  | 7,564 |  |  | 125 |  |  | (39) |  |  | 7,650 |
Equities and other mutual funds |  | 3,637 |  |  | 832 |  |  | — |  |  | 4,469 |
|  | $ | 115,394 |  |  | $ | 1,562 |  |  | $ | (39) |  |  | $ | 116,917 |

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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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