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Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenues $ 213,536 $ 225,307 $ 411,410 $ 477,747
Total investment management fees        
Disaggregation of Revenue [Line Items]        
Revenues 179,979 185,024 344,457 391,841
Open-end funds        
Disaggregation of Revenue [Line Items]        
Revenues 78,161 84,875 149,427 182,252
Closed-end funds        
Disaggregation of Revenue [Line Items]        
Revenues 14,674 16,174 29,352 33,114
Retail separate accounts        
Disaggregation of Revenue [Line Items]        
Revenues 42,803 45,312 82,882 94,915
Institutional accounts        
Disaggregation of Revenue [Line Items]        
Revenues $ 44,341 $ 38,663 $ 82,796 $ 81,560