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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities Investments Available For Sale Investments available for sale classified as non-current assets consist of:
|  | At December 31, 2017
|  | Cost |  | 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 |
|  | At December 31, 2016
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
SEI-sponsored mutual funds |  | $ | 7,357 |  |  | $ | 24 |  |  | $ | (996 | ) |  | $ | 6,385 |
Equities and other mutual funds |  | 2,968 |  |  | 228 |  |  | — |  |  | 3,196 |
Debt securities |  | 74,843 |  |  | — |  |  | (391 | ) |  | 74,452 |
|  | $ | 85,168 |  |  | $ | 252 |  |  | $ | (1,387 | ) |  | $ | 84,033 |
Net unrealized holding losses at December 31, 2017 and 2016 were $386 (net of income tax benefit of $201) and $836 (net of income tax benefit of $299), respectively. These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were gross realized gains of $529 and gross realized losses of $888 from available-for-sale securities during 2017. In 2016, there were gross realized gains of $284 and gross realized losses of $869 from available-for-sale securities. There were gross realized gains of $489 and gross realized losses of $729 from available-for-sale securities during 2015. Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive income (loss), are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment related to the startup of investment funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. The investment primarily consists of U.S. dollar denominated funds that invest in equity securities of Canadian, Australian and Japanese companies. The underlying securities held by the funds are translated into U.S. dollars within the funds. The funds had a fair value of $6,034 and $4,858 at December 31, 2017 and 2016, respectively. The Company recognized gains of $1,176 and $819 and losses of $389 from the change in fair value of the funds during 2017, 2016 and 2015, respectively. Securities Owned The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $21,526 and $21,339 at December 31, 2017 and 2016, respectively. There were no material net gains or losses from the change in fair value of the securities during 2017, 2016 and 2015.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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