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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
Marketable Securities [Abstract] |
Investments Available For Sale | Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
| At March 31, 2020
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 98,322 |  |  | $ | 2,203 |  |  | $ | — |  |  | $ | 100,525 |
SEI-sponsored mutual funds | 7,508 |  |  | — |  |  | (1,126 | ) |  | 6,382 |
Equities and other mutual funds | 3,595 |  |  | 56 |  |  | — |  |  | 3,651 |
| $ | 109,425 |  |  | $ | 2,259 |  |  | $ | (1,126 | ) |  | $ | 110,558 |
| 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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