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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Marketable Securities [Abstract] |
Investments Available For Sale | Investments available for sale classified as non-current assets consist of:
| At September 30, 2019
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
SEI-sponsored mutual funds | $ | 7,477 |  |  | $ | 105 |  |  | $ | (411 | ) |  | $ | 7,171 |
Equities and other mutual funds | 3,476 |  |  | 666 |  |  | — |  |  | 4,142 |
Debt securities | 89,625 |  |  | 642 |  |  | — |  |  | 90,267 |
| $ | 100,578 |  |  | $ | 1,413 |  |  | $ | (411 | ) |  | $ | 101,580 |
| At December 31, 2018
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
SEI-sponsored mutual funds | $ | 7,446 |  |  | $ | — |  |  | $ | (788 | ) |  | $ | 6,658 |
Equities and other mutual funds | 3,434 |  |  | 126 |  |  | — |  |  | 3,560 |
Debt securities | 103,518 |  |  | — |  |  | (1,835 | ) |  | 101,683 |
| $ | 114,398 |  |  | $ | 126 |  |  | $ | (2,623 | ) |  | $ | 111,901 |

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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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