Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,632,093	$ 1,609,574	$ 1,445,814
Investment Advisory
Disaggregation of Revenue [Line Items]
Total Revenue	1,097,866	1,115,783	1,011,631
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	387,531	343,332	294,557
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	120,276	126,350	112,356
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 26,420	$ 24,109	$ 27,270