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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, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale, Fair Value $ 6,472,100 $ 6,709,976
Corporate Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale, Fair Value 2,264,636 2,573,603
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, Fair Value $ 1,467,423 $ 1,350,814
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) 0.003
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 0.007
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 0.196 0.030
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 0.080 0.080
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 0.018 0.012
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 0.019 0.021
Available-for-sale Securities [Member] | 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 $ 77,424 $ 54,135
Available-for-sale Securities [Member] | 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 40,883 34,903
Available-for-sale Securities [Member] | Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investment assets measured at fair value [1] 180,273 162,244
Available-for-sale Securities [Member] | 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 $ 118,307 $ 89,038
[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 is neither provided to us, nor reasonably available to us, and therefore are not included in the tables above.