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Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Corporate Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 Securities $ 260,479 $ 187,980 $ 165,824 $ 114,127
Collateralized Loan Obligations and Other Asset Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 Securities 210,407 153,342 125,672 124,909
Valuation Technique, Discounted Cash Flow | Corporate Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value 121,401 81,867    
Valuation Technique, Discounted Cash Flow | Collateralized Loan Obligations and Other Asset Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value $ 98,801 $ 59,452    
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum | Corporate Securities [Member]        
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 | Collateralized Loan Obligations and Other Asset Backed Securities [Member]        
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 [Member]        
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 | Collateralized Loan Obligations and Other Asset Backed Securities [Member]        
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 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale, Measurement Input 0.021 0.013    
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average | Collateralized Loan Obligations and Other Asset Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale, Measurement Input 0.026 0.025    
Investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other investment assets measured at fair value [1] $ 258,604 $ 207,936    
Total Level 3 Securities 478,806 349,255 $ 298,580 $ 251,282
Investments [Member] | Valuation Technique, Discounted Cash Flow        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value $ 220,202 $ 141,319    
[1] Other is comprised of broker quotes or other third-party pricing for which there is a lack of transparency into the inputs used to develop the valuations. The quantitative details of these unobservable inputs are neither provided to us, nor reasonably available to us, and therefore are not included in the tables above.