v3.26.3
FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 335,089 $ 76,094 $ 182,076 $ 43,372
Net investment income        
Net foreign exchange gains (losses)   (10) (7) 33
Purchases 80,021 1,222 236,350 42,681
Sales (367)   (392)  
Settlements (6,868) (3,346) (7,832) (4,107)
Ending balance 408,367 71,244 408,367 71,244
Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 219,697   114,256  
Net investment income        
Net foreign exchange gains (losses)     0  
Purchases 27,250   132,691  
Sales 0   0  
Settlements 0   0  
Ending balance 246,947   246,947  
Asset-backed        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 91,767 40,936 39,859 0
Net investment income        
Net foreign exchange gains (losses)   0 0 0
Purchases 52,271 222 103,159 41,681
Sales (367)   (392)  
Settlements (6,868) (3,313) (7,849) (3,836)
Ending balance 136,858 38,825 136,858 38,825
Direct Private Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 23,625 35,308 27,995 43,777
Net investment income        
Net foreign exchange gains (losses)   (10) (7) 33
Purchases 500 1,000 500 1,000
Sales 0   0  
Settlements 0 0 0 0
Ending balance 24,562 32,512 24,562 32,512
Other Assets and (Liabilities)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 0 (150) (34) (405)
Net investment income        
Net foreign exchange gains (losses)   0 0 0
Purchases 0 0 0 0
Sales 0   0  
Settlements 0 (33) 17 (271)
Ending balance 0 (93) 0 (93)
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
Net investment income        
Included in earnings (loss) 1,116 1,062 3,597 1,201
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome | Corporate        
Net investment income        
Included in earnings (loss) 0   0  
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome | Asset-backed        
Net investment income        
Included in earnings (loss) 1,027 980 3,345 980
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome | Direct Private Equity Investments        
Net investment income        
Included in earnings (loss) 89 82 252 221
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome | Other Assets and (Liabilities)        
Net investment income        
Included in earnings (loss) 0 0 0 0
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses        
Net investment income        
Included in earnings (loss) (624) (3,868) (5,442) (12,519)
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses | Corporate        
Net investment income        
Included in earnings (loss) 0   0  
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses | Asset-backed        
Net investment income        
Included in earnings (loss) (972) 0 (1,264) 0
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses | Direct Private Equity Investments        
Net investment income        
Included in earnings (loss) 348 (3,868) (4,178) (12,519)
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses | Other Assets and (Liabilities)        
Net investment income        
Included in earnings (loss) $ 0 0 0 0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet        
Net investment income        
Included in earnings (loss)   90 17 583
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet | Corporate        
Net investment income        
Included in earnings (loss)     0  
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet | Asset-backed        
Net investment income        
Included in earnings (loss)   0 0 0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet | Direct Private Equity Investments        
Net investment income        
Included in earnings (loss)   0 0 0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet | Other Assets and (Liabilities)        
Net investment income        
Included in earnings (loss)   $ 90 $ 17 $ 583