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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Summary of Disaggregation of Revenue | The following table summarizes investment management fees by source:
| Years Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Investment management fees |  |  |  |  |
Open-end funds | $ | 305,238 |  |  | $ | 335,585 |  |  | $ | 395,152 |
Closed-end funds | 58,136 |  |  | 63,841 |  |  | 63,301 |
Retail separate accounts | 171,357 |  |  | 171,509 |  |  | 174,919 |
Institutional accounts | 176,744 |  |  | 157,404 |  |  | 148,213 |
Total investment management fees | $ | 711,475 |  |  | $ | 728,339 |  |  | $ | 781,585 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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