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Investment Securities (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 14, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Nov. 11, 2019
Debt Securities, Available-for-sale [Line Items]                
Cash distributions received         $ 53,484,000 $ 855,000    
Proceeds from sale or liquidation of long-term investments         23,407,000 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         23,510,000      
In-transit redemptions     $ 2,148,000   $ 2,148,000      
Optika Fund LLC (“Optika”)                
Debt Securities, Available-for-sale [Line Items]                
Equity-method ownership percentage     7.10%   7.10%      
Boyar Value Fund (“Boyar”)                
Debt Securities, Available-for-sale [Line Items]                
Equity-method ownership percentage     35.75%   35.75%      
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