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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following table summarizes investment management fees by source:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Investment management fees |  |  |  |  |  |  |
Open-end funds | $ | 73,270 |  |  | $ | 79,428 |  |  | $ | 217,686 |  |  | $ | 237,991 |
Closed-end funds | 15,635 |  |  | 14,942 |  |  | 45,369 |  |  | 43,741 |
Retail separate accounts | 52,172 |  |  | 52,068 |  |  | 158,262 |  |  | 153,265 |
Institutional accounts | 42,685 |  |  | 47,405 |  |  | 128,012 |  |  | 138,858 |
Total investment management fees | $ | 183,762 |  |  | $ | 193,843 |  |  | $ | 549,329 |  |  | $ | 573,855 |

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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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