Investments - Investments, Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	$ 67,029	$ 87,808
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(216)	2,411
Equity Investments, at Fair Value	66,813	90,219
Securities Short Sold Proceeds	296	259
Securities Short Sold Unrealized (Gain)/Loss	(20)	(22)
Securities Short Sold,Fair Value	276	237
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	67,029	80,480
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(216)	2,420
Equity Investments, at Fair Value	66,813	82,900
Securities Short Sold Proceeds	296	259
Securities Short Sold Unrealized (Gain)/Loss	(20)	(22)
Securities Short Sold,Fair Value	276	237
Mutual Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	0	7,328
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	0	(9)
Equity Investments, at Fair Value	$ 0	$ 7,319