v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 252,644 $ 38,753 $ 182,076 $ 43,372
Net investment income        
Net foreign exchange gains (losses) 2 29 (7) 43
Purchases 83,246 41,459 156,329 41,459
Sales (25)   (25)  
Settlements (905) (565) (964) (761)
Ending balance 335,089 76,094 335,089 76,094
Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 144,696   114,256  
Net investment income        
Net foreign exchange gains (losses) 0   0  
Purchases 75,001   105,441  
Sales 0   0  
Settlements 0   0  
Ending balance 219,697   219,697  
Asset-backed        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 83,652 0 39,859 0
Net investment income        
Net foreign exchange gains (losses) 0 0 0 0
Purchases 8,245 41,459 50,888 41,459
Sales (25)   (25)  
Settlements (905) (523) (981) (523)
Ending balance 91,767 40,936 91,767 40,936
Direct Private Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 24,296 38,987 27,995 43,777
Net investment income        
Net foreign exchange gains (losses) 2 29 (7) 43
Purchases 0 0 0 0
Sales 0   0  
Settlements 0 0 0 0
Ending balance 23,625 35,308 23,625 35,308
Other Assets and (Liabilities)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 0 (234) (34) (405)
Net investment income        
Net foreign exchange gains (losses) 0 0 0 0
Purchases 0 0 0 0
Sales 0   0  
Settlements 0 (42) 17 (238)
Ending balance 0 (150) 0 (150)
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
Net investment income        
Included in earnings (loss) 1,248 70 2,481 139
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) 1,166 0 2,318 0
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome | Direct Private Equity Investments        
Net investment income        
Included in earnings (loss) 82 70 163 139
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) (1,121) (3,778) (4,818) (8,651)
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) (366) 0 (292) 0
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses | Direct Private Equity Investments        
Net investment income        
Included in earnings (loss) (755) (3,778) (4,526) (8,651)
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)   126 17 493
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)   $ 126 $ 17 $ 493