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Investments - Cost and Fair Value of Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost $ 162,499 $ 163,157
Investment at Fair Value, Fair Value 148,674 165,894
Equity method investments, Cost 27,517 14,194
Equity method investments, Fair Value 27,517 14,194
Total Investments, Cost 190,016 177,351
Total Investments, Fair Value 176,191 180,088
Mutual funds    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 122 93
Investment at Fair Value, Fair Value 105 75
Exchange-traded funds    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 101 105
Investment at Fair Value, Fair Value 112 108
TIG Arbitrage Associates Master Fund    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 482 482
Investment at Fair Value, Fair Value 515 500
TIG Arbitrage Enhanced Master Fund    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 179 179
Investment at Fair Value, Fair Value 229 231
TIG Arbitrage Enhanced    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 0 682
Investment at Fair Value, Fair Value 0 776
Arkkan Opportunities Feeder Fund    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 111 111
Investment at Fair Value, Fair Value 139 119
Arkkan Capital Management Limited    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 20,062 20,062
Investment at Fair Value, Fair Value 21,181 24,822
Zebedee Asset Management    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 68,913 68,913
Investment at Fair Value, Fair Value 80,127 69,454
Romspen Investment Corporation    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 72,523 72,523
Investment at Fair Value, Fair Value 46,260 69,802
Other    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment at Fair Value, Cost 6 7
Investment at Fair Value, Fair Value 6 7
Real estate equity method investments    
Schedule of Held-to-Maturity Securities [Line Items]    
Equity method investments, Cost 5,863 9,311
Equity method investments, Fair Value 5,863 9,311
Wealth management - investment advisory    
Schedule of Held-to-Maturity Securities [Line Items]    
Equity method investments, Cost 20,404 2,505
Equity method investments, Fair Value 20,404 2,505
Carried interest vehicles    
Schedule of Held-to-Maturity Securities [Line Items]    
Equity method investments, Cost 1,250 2,378
Equity method investments, Fair Value $ 1,250 $ 2,378