Investments - Investments, Fair Value (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	$ 29,824,000	$ 87,808,000
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(6,137,000)	2,411,000
Equity Investments, at Fair Value	23,687,000	90,219,000
Trading Securities, at Fair Value, Cost	24,843,000
Trading Securities, at Fair Value, Unrealized Gain/(Loss)	(624,000)
Trading Securities, at Fair Value	24,219,000	0
Securities Short Sold Proceeds	300,000	259,000
Securities Short Sold Unrealized (Gain)/Loss	(69,000)	(22,000)
Securities Short Sold,Fair Value	231,000	237,000
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	29,824,000	80,480,000
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(6,137,000)	2,420,000
Equity Investments, at Fair Value	23,687,000	82,900,000
Securities Short Sold Proceeds	300,000	259,000
Securities Short Sold Unrealized (Gain)/Loss	(69,000)	(22,000)
Securities Short Sold,Fair Value	231,000	237,000
Mutual Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	0	7,328,000
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	0	(9,000)
Equity Investments, at Fair Value	0	7,319,000
Leveraged Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities, at Fair Value, Cost	21,884,000
Trading Securities, at Fair Value, Unrealized Gain/(Loss)	(616,000)
Trading Securities, at Fair Value	21,268,000	0
Corporate Bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities, at Fair Value, Cost	2,959,000
Trading Securities, at Fair Value, Unrealized Gain/(Loss)	(8,000)
Trading Securities, at Fair Value	$ 2,951,000	$ 0