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Fair Value Measurements - Schedule of Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other investment assets measured at fair value $ 304,333 $ 222,447    
Total Level 3 securities 756,727 619,247    
Valuation Technique, Discounted Cash Flow        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value 452,394 396,800    
Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 securities 267,821 242,679 $ 293,713 $ 297,332
Corporate securities | Valuation Technique, Discounted Cash Flow        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value $ 157,700 $ 147,294    
Corporate securities | Valuation Technique, Discounted Cash Flow | Minimum | Illiquidity Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input (0.044) (0.044)    
Corporate securities | Valuation Technique, Discounted Cash Flow | Maximum | Illiquidity Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.053 0.053    
Corporate securities | Valuation Technique, Discounted Cash Flow | Weighted Average | Illiquidity Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.017 0.017    
CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 securities $ 481,037 $ 367,994 $ 263,720 $ 245,313
CLO and other ABS | Valuation Technique, Discounted Cash Flow        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value $ 294,694 $ 249,506    
CLO and other ABS | Valuation Technique, Discounted Cash Flow | Minimum | Illiquidity Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input (0.018) (0.0097)    
CLO and other ABS | Valuation Technique, Discounted Cash Flow | Maximum | Illiquidity Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.196 0.196    
CLO and other ABS | Valuation Technique, Discounted Cash Flow | Weighted Average | Illiquidity Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.019 0.019