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Fair Value Measurements - Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 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 $ 245,842 $ 288,955    
Total Level 3 securities 556,762 551,689    
Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 securities 287,496 297,332 $ 211,585 $ 187,980
CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 securities 260,097 245,313 $ 179,758 $ 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 310,920 262,734    
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 155,633 135,524    
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 $ 155,287 $ 127,210    
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit 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 | Measurement Input, Credit 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 0.0001 0.0001    
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit 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 | Measurement Input, Credit 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 | Measurement Input, Credit 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 0.018 0.019    
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit 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 0.024 0.024