Investments - Investments, Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	$ 87,808	$ 23,814
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	2,411	2,239
Equity Investments, at Fair Value	90,219	26,053
Securities Short Sold, Cost	259	620
Securities Short Sold, Unrealized (Gain)/Loss	(22)	94
Securities Short Sold, Fair Value	237	714
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	80,480	16,521
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	2,420	2,218
Equity Investments, at Fair Value	82,900	18,739
Securities Short Sold, Cost	259	620
Securities Short Sold, Unrealized (Gain)/Loss	(22)	94
Securities Short Sold, Fair Value	237	714
Mutual Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	7,328	7,293
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(9)	21
Equity Investments, at Fair Value	$ 7,319	$ 7,314