v3.26.1
Fair Value Measurement - Ranges of Significant Unobservable Inputs to Value Level 3 Assets (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 232,906 $ 278,883
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 164,787 153,055
Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 190,403 203,511
Debt | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 136,437 121,618
Debt | Level 3 | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 103,739 86,912
Debt | Level 3 | Recent Transaction    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1]   25,325
Debt | Level 3 | Recent Transaction | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 25,325  
Debt | Level 3 | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 4,411 8,386
Debt | Level 3 | Broker Quotes | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 2,257 $ 995
Debt | Level 3 | Asset Recovery Liquidation Valuation Technique | Recovery Rates    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 705  
Debt | Level 3 | Minimum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0702 0.0802
Debt | Level 3 | Minimum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0 0
Debt | Level 3 | Minimum | Broker Quotes | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0608 0.995
Debt | Level 3 | Minimum | Asset Recovery Liquidation Valuation Technique | Recovery Rates    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.17  
Debt | Level 3 | Maximum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.2935 0.2719
Debt | Level 3 | Maximum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0975 0.0975
Debt | Level 3 | Maximum | Broker Quotes | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) 0.8257 [1],[2] 0.995
Debt | Level 3 | Maximum | Asset Recovery Liquidation Valuation Technique | Recovery Rates    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.22  
Debt | Level 3 | Weighted Average | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.1364 0.1495
Debt | Level 3 | Weighted Average | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0478 0
Debt | Level 3 | Weighted Average | Broker Quotes | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) 0.3666 [1],[2] 0.995
Debt | Level 3 | Weighted Average | Asset Recovery Liquidation Valuation Technique | Recovery Rates    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.195  
Debt | Level 3 | Equity Funds Two | Minimum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0007  
Debt | Level 3 | Equity Funds Two | Maximum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.1406  
Debt | Level 3 | Equity Funds Two | Weighted Average | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0877  
Equity/Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 32,903 $ 42,569
Equity/Other | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 28,350 31,437
Equity/Other | Level 3 | Equity Funds One | Recent Transaction    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 12,465 13,137
Equity/Other | Level 3 | Equity Funds Two | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 6,711 6,474
Equity/Other | Level 3 | Equity Funds Two | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 2,115 $ 5,082
Equity/Other | Level 3 | Equity Funds Two | Minimum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0998 0.17
Equity/Other | Level 3 | Equity Funds Two | Minimum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2]   0.0009
Equity/Other | Level 3 | Equity Funds Two | Maximum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.195 0.19
Equity/Other | Level 3 | Equity Funds Two | Maximum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2]   0.10
Equity/Other | Level 3 | Equity Funds Two | Weighted Average | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.1821 0.18
Equity/Other | Level 3 | Equity Funds Two | Weighted Average | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2]   0.0876
Equity/Other | Level 3 | Equity Funds Three | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 6,975 $ 6,659
Equity/Other | Level 3 | Equity Funds Three | Minimum | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0 0
Equity/Other | Level 3 | Equity Funds Three | Maximum | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.65 0.65
Equity/Other | Level 3 | Equity Funds Three | Weighted Average | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.325 0.325
Equity/Other | Level 3 | Equity Funds Four | Asset Recovery Liquidation Valuation Technique    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1],[3] $ 84 $ 85
[1] The fair value of any one instrument may be determined using multiple valuation techniques or unobservable inputs.
[2] Weighted average for an asset category consisting of multiple investments is calculated by weighting the significant unobservable input by the relative fair value of the investment. The range and weighted average for an asset category consisting of a single investment represents the significant unobservable input used in the fair value of the investment.
[3] Investments valued using the asset recovery or liquidation technique include investments for which valuation is based on current financial data without a discount rate applied.