The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Investment Securities (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
Investment Securities (Narrative) (Details) - USD ($)	Feb. 14, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 11, 2019
Debt Securities, Available-for-sale [Line Items]
Cash distributions received					$ 53,528,000	$ 1,495,000
Proceeds from sale or liquidation of long-term investments					30,255,000	0
Equity securities without readily determinable fair value			$ 5,200,000		5,200,000		$ 6,200,000
Impairment and other adjustments			0	$ 0	0	$ 0
NAV
Debt Securities, Available-for-sale [Line Items]
Cash distributions received					30,358,000
In-transit redemptions			$ 2,438,000		$ 2,438,000
Optika Fund LLC (“Optika”)
Debt Securities, Available-for-sale [Line Items]
Equity-method ownership percentage			6.24%		6.24%
Boyar Value Fund (“Boyar”)
Debt Securities, Available-for-sale [Line Items]
Equity-method ownership percentage			36.70%		36.70%
Common Stock \| Equity Method Investee \| LTS Common Stock \| Ladenburg Thalmann Financial Services Inc. (“LTS”)
Debt Securities, Available-for-sale [Line Items]
Sale of stock (in dollars per share)								$ 3.50
Proceeds from common shares	$ 53,169,000
Common shares of LTS (in shares)	15,191,205
Redeemable Preferred Stock \| Equity Method Investee \| LTS Preferred \| Ladenburg Thalmann Financial Services Inc. (“LTS”)
Debt Securities, Available-for-sale [Line Items]
Proceeds from common shares		$ 6,009,000
Common shares of LTS (in shares)			240,000		240,000
Dividend percentage of preferred stock					8.00%
Liquidation preference (in dollars per share)			$ 25.00		$ 25.00