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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2022
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 119,702 |  |  | $ | — |  |  | $ | (8,832) |  |  | $ | 110,870 |
SEI-sponsored mutual funds | 6,271 |  |  | — |  |  | (249) |  |  | 6,022 |
Equities and other mutual funds | 4,870 |  |  | — |  |  | (80) |  |  | 4,790 |
| $ | 130,843 |  |  | $ | — |  |  | $ | (9,161) |  |  | $ | 121,682 |
| At December 31, 2021
| Cost Amount |  | 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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- References No definition available. + Details
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