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Marketable Securities | 9 Months Ended
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Sep. 30, 2021
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities include investments in money market funds and commercial paper classified as cash equivalents, available-for-sale debt securities, investments in SEI-sponsored and non-SEI-sponsored mutual funds, equities, investments in funds sponsored by LSV and securities owned by SIDCO. Cash Equivalents Investments in money market funds and commercial paper classified as cash equivalents had a fair value of $453,628 and $462,624 at September 30, 2021 and December 31, 2020, respectively. There were no material unrealized or realized gains or losses from these investments during the nine months ended September 30, 2021 and 2020. Investments in money market funds and commercial paper are Level 1 assets. Available for Sale and Equity Securities Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
| At September 30, 2021
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 126,964 |  |  | $ | 874 |  |  | $ | — |  |  | $ | 127,838 |
SEI-sponsored mutual funds | 6,692 |  |  | 380 |  |  | — |  |  | 7,072 |
Equities and other mutual funds | 4,932 |  |  | 237 |  |  | — |  |  | 5,169 |
| $ | 138,588 |  |  | $ | 1,491 |  |  | $ | — |  |  | $ | 140,079 |
| At December 31, 2020
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 91,262 |  |  | $ | 2,015 |  |  | $ | — |  |  | $ | 93,277 |
SEI-sponsored mutual funds | 6,866 |  |  | 382 |  |  | — |  |  | 7,248 |
Equities and other mutual funds | 4,421 |  |  | 473 |  |  | — |  |  | 4,894 |
| $ | 102,549 |  |  | $ | 2,870 |  |  | $ | — |  |  | $ | 105,419 |
Net unrealized gains at September 30, 2021 of available-for-sale debt securities were $673 (net of income tax expense of $201). Net unrealized gains at December 31, 2020 of available-for-sale debt securities were $1,551 (net of income tax expense of $464). These net unrealized gains are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were gross realized losses of $861 and $582 from available-for-sale debt securities during the nine months ended September 30, 2021 and 2020, respectively. There were no gross realized gains from available-for-sale debt securities during the nine months ended September 30, 2021 and 2020. Realized losses from available-for-sale debt securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations. There were gross realized gains of $714 and gross realized losses of $65 from mutual funds and equities during the nine months ended September 30, 2021. There were gross realized gains of $254 and gross realized losses of $250 from mutual funds and equities during the nine months ended September 30, 2020. Gains and losses from mutual funds and equities are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment in 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 (loss) gain from investments on the accompanying Consolidated Statements of Operations. The funds had a fair value of $6,893 and $6,166 at September 30, 2021 and December 31, 2020, respectively. The Company recognized unrealized losses of $39 and unrealized gains of $458 during the three months ended September 30, 2021 and 2020, respectively, from the change in fair value of the funds. The Company recognized unrealized gains of $727 and unrealized losses of $781 during the nine months ended September 30, 2021 and 2020, respectively, from the change in fair value of the funds. 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 $31,770 and $34,064 at September 30, 2021 and December 31, 2020, respectively. There were no material net gains or losses related to the securities during the three and nine months ended September 30, 2021 and 2020.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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