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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
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other investment assets measured at fair value $ 222,447 $ 288,955  
Total Level 3 securities 619,247 551,689  
Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total Level 3 securities 242,679 297,332 $ 187,980
CLO and other ABS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total Level 3 securities 367,994 245,313 $ 153,342
Valuation Technique, Discounted Cash Flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets measured at fair value 396,800 262,734  
Valuation Technique, Discounted Cash Flow | Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets measured at fair value 147,294 135,524  
Valuation Technique, Discounted Cash Flow | CLO and other ABS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets measured at fair value $ 249,506 $ 127,210  
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Minimum | Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale, measurement input (0.044) (0.044)  
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Minimum | CLO and other ABS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale, measurement input (0.0097) 0.0001  
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Maximum | Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale, measurement input 0.053 0.053  
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Maximum | CLO and other ABS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale, measurement input 0.196 0.196  
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Weighted Average | Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale, measurement input 0.017 0.019  
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Weighted Average | CLO and other ABS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale, measurement input 0.019 0.024