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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Marketable Securities [Abstract] |
Investments Available For Sale | Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
| At June 30, 2021
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 115,818 |  |  | $ | 1,490 |  |  | $ | — |  |  | $ | 117,308 |
SEI-sponsored mutual funds | 6,896 |  |  | 666 |  |  | — |  |  | 7,562 |
Equities and other mutual funds | 4,933 |  |  | 236 |  |  | — |  |  | 5,169 |
| $ | 127,647 |  |  | $ | 2,392 |  |  | $ | — |  |  | $ | 130,039 |
| At December 31, 2020
| Cost Amount |  | 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 |

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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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