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Investments (Tables) | 3 Months Ended
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Mar. 31, 2023
Schedule of Investments [Abstract] |
Schedule of Investments | The Company's investments, excluding the assets of consolidated investment products ("CIP") discussed in Note 16, at March 31, 2023 and December 31, 2022 were as follows:
(in thousands) | March 31, 2023 |  | December 31, 2022
Investment securities - fair value | $ | 80,654 |  |  | $ | 76,999 |
Equity method investments (1) | 22,755 |  |  | 11,448 |
Nonqualified retirement plan assets | 10,740 |  |  | 10,154 |
Other investments | 1,514 |  |  | 1,729 |
Total investments | $ | 115,663 |  |  | $ | 100,330 |
(1) The Company's equity method investments are valued on a three-month lag based upon the availability of financial information. On January 1, 2023, the Company made an additional investment in an existing minority interest in an affiliated manager for $11.6 million including transaction costs.
Schedule of Marketable Securities | The composition of the Company’s investment securities - fair value was as follows:
| March 31, 2023 |  | December 31, 2022
(in thousands) | Cost |  | Fair Value |  | Cost |  | Fair Value
Investment Securities - fair value |  |  |  |  |  |  |
Sponsored funds | $ | 69,995 |  |  | $ | 65,551 |  |  | $ | 67,472 |  |  | $ | 62,744 |
Equity securities | 13,511 |  |  | 15,103 |  |  | 13,440 |  |  | 14,255 |
Total investment securities - fair value | $ | 83,506 |  |  | $ | 80,654 |  |  | $ | 80,912 |  |  | $ | 76,999 |

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI https://asc.fasb.org/topic&trid=2197064 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI https://asc.fasb.org/topic&trid=75115024 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI https://asc.fasb.org/topic&trid=2196965 + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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