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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2023
Revenue from Contract with Customer [Abstract] |
Schedule of Investment Management Fees by Source | The following table summarizes investment management fees by source:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Investment management fees |  |  |  |  |  |  |
Open-end funds | $ | 80,294 |  |  | $ | 80,234 |  |  | $ | 229,721 |  |  | $ | 262,486 |
Closed-end funds | 14,673 |  |  | 15,773 |  |  | 44,025 |  |  | 48,887 |
Retail separate accounts | 44,441 |  |  | 39,154 |  |  | 127,323 |  |  | 134,069 |
Institutional accounts | 45,461 |  |  | 37,689 |  |  | 128,257 |  |  | 119,249 |
Total investment management fees | $ | 184,869 |  |  | $ | 172,850 |  |  | $ | 529,326 |  |  | $ | 564,691 |

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