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Fair Value Measurement (Quantitative Information Regarding Level 3 Valuations) (Details) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Assets: |  |
Estimated Fair Value | $ 3,544,137 | $ 3,493,597
Other investments | 246,143 | 245,455
Level 3 |  |
Assets: |  |
Equity investments | 5,234 | 5,237
Other investments | 742 | 5,126
Liabilities: |  |
Other liabilities | $ 6,500 | 6,500
Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum |  |
Assets: |  |
Equity securities measured at fair value | 0 |
Other investments, measurement input | 0 |
Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum |  |
Assets: |  |
Equity securities measured at fair value | 0.10 |
Other investments, measurement input | 0.10 |
Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average |  |
Assets: |  |
Equity securities measured at fair value | 0.05 |
Other investments, measurement input | 0.05 |
Level 3 | Weighted Average Cost of Capital | Stochastic Model/Discounted Cash Flows | Minimum |  |
Liabilities: |  |
Other liabilities, measurement input | 0.00% |
Level 3 | Weighted Average Cost of Capital | Stochastic Model/Discounted Cash Flows | Maximum |  |
Liabilities: |  |
Other liabilities, measurement input | 10.00% |
Level 3 | Weighted Average Cost of Capital | Stochastic Model/Discounted Cash Flows | Weighted Average |  |
Liabilities: |  |
Other liabilities, measurement input | 8.00% |
Corporate debt, limited observable inputs | Level 3 |  |
Assets: |  |
Estimated Fair Value | $ 66,208 | 82,377
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Market Comparable Securities | Minimum |  |
Assets: |  |
Assets measured at fair value | 0 |
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Market Comparable Securities | Maximum |  |
Assets: |  |
Assets measured at fair value | 0.05 |
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Market Comparable Securities | Weighted Average |  |
Assets: |  |
Assets measured at fair value | 0.025 |
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum |  |
Assets: |  |
Assets measured at fair value | 0 |
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum |  |
Assets: |  |
Assets measured at fair value | 0.05 |
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average |  |
Assets: |  |
Assets measured at fair value | 0.025 |
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 |  |
Assets: |  |
Estimated Fair Value | $ 2,141 | $ 4,414
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Minimum |  |
Assets: |  |
Assets measured at fair value | 0 |
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Maximum |  |
Assets: |  |
Assets measured at fair value | 0.05 |
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Weighted Average |  |
Assets: |  |
Assets measured at fair value | 0.025 |
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum |  |
Assets: |  |
Assets measured at fair value | 0 |
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum |  |
Assets: |  |
Assets measured at fair value | 0.05 |
Residential mortgage-backed, other commercial mortgage-backed and other asset-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average |  |
Assets: |  |
Assets measured at fair value | 0.025 |

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