Consolidated Statements of Financial Condition (Parenthetical) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Assets
Security Owned and Pledged as Collateral, Fair Value	$ 1,733,491,000	$ 1,764,853,000
Allowance for receivable from brokers	600,000	636,000
Allowance for receivable from customers	592,000	687,000
Allowance for fees receivable	5,378,000	886,000
Fixed assets, accumulated depreciation and amortization (in dollars)	52,237,000	50,017,000
Intangible assets, accumulated amortization (in dollars)	35,143,000	33,219,000
Other Assets	$ 1,204,000	$ 0
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	120,750	120,750
Preferred stock, shares outstanding	120,750	120,750
Preferred Stock, Liquidation Preference, Value	$ 120,750,000	$ 120,750,000
Common stock, shares authorized	125,000,000
Portfolio Funds
Assets
Investment Owned, at Fair Value	$ 122,597,000	$ 137,986,000
Common Stock Class A
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	62,500,000	62,500,000
Common stock, shares issued	57,996,481	55,826,893
Common stock, shares outstanding	28,014,299	27,778,964
Treasury Stock, Shares	29,982,182	28,047,929
Common Stock Class A | Restricted Stock
Stockholders' equity
Common stock, shares outstanding	1,024,054	901,374
Common Stock Class B
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	62,500,000	62,500,000
Common stock, shares issued	0	0
Common stock, shares outstanding	0	0