Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 852,865	$ 906,949	$ 845,268
Investment management fees
Disaggregation of Revenue [Line Items]
Revenues	725,039	773,830	711,475
Open-end funds
Disaggregation of Revenue [Line Items]
Revenues	286,610	317,990	305,238
Closed-end funds
Disaggregation of Revenue [Line Items]
Revenues	61,305	59,184	58,136
Retail separate accounts
Disaggregation of Revenue [Line Items]
Revenues	209,538	209,467	171,357
Institutional accounts
Disaggregation of Revenue [Line Items]
Revenues	$ 167,586	$ 187,189	$ 176,744