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Investments, at Fair Value - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 27, 2022
USD ($)
Apr. 01, 2022
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
underlyingInvestment
investmentFund
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
underlyingInvestment
investmentFund
Dec. 31, 2022
USD ($)
Aug. 01, 2023
USD ($)
Mar. 31, 2023
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Customer ExAlt Trusts loan payable, net           $ 56,700,000      
Distribution proceeds           $ 38,371,000 $ 45,350,000    
Alternative investment funds | investmentFund       247   247      
Underlying investments | underlyingInvestment       900   900      
Percent of underlying investments in private companies       89.00%   89.00%      
Purchase of put options           $ 0 7,451,000    
Notational amount of put options   $ 141,300,000              
Proceeds from equity interest [1]             2,430,000    
Proceeds from sale of put options by Ben     $ 1,000,000     968,000 0    
Gain (loss) on investment       $ (18,024,000) $ (23,043,000) (64,260,000) (56,101,000)    
Investments       378,420,000   378,420,000     $ 497,221,000
Noncredit-related portion of net unrealized losses       51,000 (1,307,000) 4,236,000 6,400,000    
Unrealized net gains [2]           13,694,000      
Credit-related portion of other-than-temporary impairment on investment in debt securities       0 0 0 12,600,000    
Equity securities without readily determinable fair value       64,500,000   64,500,000     21,600,000
Equity impairment loss       0 0 0 0    
Put options                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Gain (loss) on investment     $ (700,000) 0 (3,825,000) (3,023,000) (1,081,000)    
Investments       0   0     3,991,000
Ben                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Equity securities without readily determinable fair value       38,000   38,000     0
Ben | Put options                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Gain (loss) on investment         $ (2,800,000) (2,000,000) $ (800,000)    
CT Risk Management, L.L.C.                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Purchase of put options   $ 5,000,000              
Proceeds from equity interest $ 2,400,000                
Class A common stock, par value $0.001 per share | GWG Holdings                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Fair value of common stock                 3,700,000
Class A common stock, par value $0.001 per share | Other Public Companies                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Fair value of common stock       4,200,000   4,200,000     $ 8,800,000
Wind Down Trust | GWG Holdings                  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                  
Fair value of common stock       $ 3,800,000   $ 3,800,000   $ 17,400,000  
[1] Retroactively adjusted March 31, 2022 and the nine months ended December 31, 2022 for de-SPAC merger transaction as described in Note 4.
[2] Retroactively adjusted March 31, 2023 for de-SPAC merger transaction as described in Note 4.