Investments - Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investment Securities - fair value
Cost	$ 85,038	$ 73,749
Fair Value	88,421	80,335
Sponsored funds
Investment Securities - fair value
Cost	74,362	63,090
Fair Value	75,722	66,326
Equity securities
Investment Securities - fair value
Cost	10,676	10,659
Fair Value	$ 12,699	$ 14,009