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Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Investment Owned, at Cost $ 32,982 $ 19,861
Schedule Of Investments [Line Items]    
Trading Securities, Cost 32,717 16,121
Equity Method Investments $ 4,284 6,574
Equity Method Investment, Ownership Percentage 47.50%  
Zarvona Energy Fund II-A, L.P. [Domain]    
Schedule Of Investments [Line Items]    
Equity Method Investments $ 700 $ 700
Equity Method Investment, Ownership Percentage 0.50% 0.50%
Broadmark Asset Management LLC [Domain]    
Schedule Of Investments [Line Items]    
Equity Method Investments $ 0 $ 2,417
Equity Method Investment, Ownership Percentage 0.00% 47.50%
Salient MLP Total Return Fund, L.P. [Domain]    
Schedule Of Investments [Line Items]    
Equity Method Investments $ 11 $ 11
Equity Method Investment, Ownership Percentage 0.00% 0.00%
Salient MLP Total Return TE Fund, L.P. [Domain]    
Schedule Of Investments [Line Items]    
Equity Method Investments $ 8 $ 8
Equity Method Investment, Ownership Percentage 0.20% 0.20%
Total [Domain]    
Schedule Of Investments [Line Items]    
Equity Method Investments $ 4,284 $ 6,574
Zarvona Energy Fund GP, L.P. [Domain]    
Schedule Of Investments [Line Items]    
Equity Method Investments $ 3,565 $ 3,438
Equity Method Investment, Ownership Percentage 50.00% 50.00%