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Revenues (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Investment management fees |  |  |  |  |  |  |
Open-end funds | $ | 70,379 |  |  | $ | 79,883 |  |  | $ | 144,416 |  |  | $ | 158,563 |
Closed-end funds | 14,881 |  |  | 14,405 |  |  | 29,734 |  |  | 28,799 |
Retail separate accounts | 51,818 |  |  | 52,216 |  |  | 106,090 |  |  | 101,197 |
Institutional accounts | 42,398 |  |  | 45,148 |  |  | 85,327 |  |  | 91,453 |
Total investment management fees | $ | 179,476 |  |  | $ | 191,652 |  |  | $ | 365,567 |  |  | $ | 380,012 |

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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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