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Fair Value (Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets) (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investment assets measured at fair value | $ 288,955 | $ 207,936 |
Total Level 3 Securities | 551,689 | 349,255 | $ 251,282
Corporate Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Level 3 Securities | 297,332 | 187,980 | 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 | 245,313 | 153,342 | $ 124,909
Valuation Technique, Discounted Cash Flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 262,734 | 141,319 |
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 | 135,524 | 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 | $ 127,210 | $ 59,452 |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 | 0.019 | 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 | 0.024 | 0.025 |

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