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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Marketable Securities [Abstract] |
Investments Available For Sale | Investments available for sale classified as non-current assets consist of:
| At September 30, 2018
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
SEI-sponsored mutual funds | $ | 7,392 |  |  | $ | 107 |  |  | $ | (304 | ) |  | $ | 7,195 |
Equities and other mutual funds | 3,479 |  |  | 652 |  |  | — |  |  | 4,131 |
Debt securities | 75,673 |  |  | — |  |  | (2,701 | ) |  | 72,972 |
| $ | 86,544 |  |  | $ | 759 |  |  | $ | (3,005 | ) |  | $ | 84,298 |
| At December 31, 2017
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
SEI-sponsored mutual funds | $ | 7,369 |  |  | $ | 110 |  |  | $ | (143 | ) |  | $ | 7,336 |
Equities and other mutual funds | 3,456 |  |  | 458 |  |  | — |  |  | 3,914 |
Debt securities | 77,745 |  |  | — |  |  | (1,012 | ) |  | 76,733 |
| $ | 88,570 |  |  | $ | 568 |  |  | $ | (1,155 | ) |  | $ | 87,983 |

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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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