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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 ($) | Dec. 31, 2021 USD ($)
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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.

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