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v3.19.1

Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Marketable Securities [Abstract] |
Investments Available For Sale | Investments available for sale classified as non-current assets consist of:
| At March 31, 2019
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
SEI-sponsored mutual funds | $ | 7,429 |  |  | $ | 77 |  |  | $ | (384 | ) |  | $ | 7,122 |
Equities and other mutual funds | 3,475 |  |  | 514 |  |  | — |  |  | 3,989 |
Debt securities | 99,401 |  |  | — |  |  | (688 | ) |  | 98,713 |
| $ | 110,305 |  |  | $ | 591 |  |  | $ | (1,072 | ) |  | $ | 109,824 |
| 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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