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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Total fixed maturity securities available for sale | $ 17,180,102 | $ 16,528,692
Equity securities | 1,173,589 | 941,243
Equity securities | 1,165,000 | 1,180,000
Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 17,180,102 | 16,528,692
Equity securities | 1,173,589 | 941,243
Equity securities | 1,165,016 | 1,179,606
Assets, fair value disclosure | 19,518,707 | 18,649,541
Liabilities: |  |
Trading account securities sold but not yet purchased | 6 | 1,169
Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 870,592 | 855,343
Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,873,124 | 3,304,133
Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,591,025 | 1,068,075
Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,241,438 | 4,490,565
Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 6,204,744 | 5,595,675
Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,399,179 | 1,214,901
Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 952,369 | 695,403
Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 221,220 | 245,840
Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 948,233 | 684,470
Equity securities | 1,123,116 | 1,153,079
Assets, fair value disclosure | 2,071,349 | 1,837,549
Liabilities: |  |
Trading account securities sold but not yet purchased | 6 | 1,137
Level 1 | Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 948,233 | 684,470
Level 1 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 0 | 0
Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 17,180,102 | 16,528,692
Equity securities | 211,069 | 236,183
Equity securities | 37,373 | 26,527
Assets, fair value disclosure | 17,428,544 | 16,791,402
Liabilities: |  |
Trading account securities sold but not yet purchased | 0 | 32
Level 2 | Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 870,592 | 855,343
Level 2 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,873,124 | 3,304,133
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,591,025 | 1,068,075
Level 2 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,241,438 | 4,490,565
Level 2 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 6,204,744 | 5,595,675
Level 2 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,399,179 | 1,214,901
Level 2 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 1,145 | 1,639
Level 2 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 209,924 | 234,544
Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 14,287 | 20,590
Equity securities | 4,527 | 0
Assets, fair value disclosure | 18,814 | 20,590
Liabilities: |  |
Trading account securities sold but not yet purchased | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 2,991 | 9,294
Level 3 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | $ 11,296 | $ 11,296

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