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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Marketable Securities [Abstract] |
Investments Available For Sale | Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
| At September 30, 2020 |  |  |  |  |  |
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 103,365 |  |  | $ | 2,106 |  |  | $ | — |  |  | $ | 105,471 |
SEI-sponsored mutual funds | 6,793 |  |  | 63 |  |  | (277) |  |  | 6,579 |
Equities and other mutual funds | 3,605 |  |  | 909 |  |  | — |  |  | 4,514 |
| $ | 113,763 |  |  | $ | 3,078 |  |  | $ | (277) |  |  | $ | 116,564 |
| At December 31, 2019 |  |  |  |  |  |
| Cost Amount |  | 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 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 http://asc.fasb.org/topic&trid=2196928 + Details
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- References No definition available. + Details
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