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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenues $ 216,897 $ 144,566
Investment management fees    
Disaggregation of Revenue [Line Items]    
Revenues 173,269 120,288
Open-end funds    
Disaggregation of Revenue [Line Items]    
Revenues 88,872 59,108
Closed-end funds    
Disaggregation of Revenue [Line Items]    
Revenues 12,940 10,179
Retail separate accounts    
Disaggregation of Revenue [Line Items]    
Revenues 37,512 25,714
Institutional accounts    
Disaggregation of Revenue [Line Items]    
Revenues 32,438 22,917
Structured products    
Disaggregation of Revenue [Line Items]    
Revenues 1,259 1,574
Other products    
Disaggregation of Revenue [Line Items]    
Revenues 248 796
Distribution and service fees    
Disaggregation of Revenue [Line Items]    
Revenues 20,348 9,460
Administration and shareholder service fees    
Disaggregation of Revenue [Line Items]    
Revenues 22,560 14,653
Other income and fees    
Disaggregation of Revenue [Line Items]    
Revenues $ 720 $ 165