Revenues (Tables)

12 Months Ended

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