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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Total fixed maturity securities available for sale | $ 16,801,000 | $ 16,528,692
Equity securities | 1,155,326 | 941,243
Equity securities | 1,142,000 | 1,180,000
Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 16,801,000 | 16,528,692
Equity securities | 1,155,326 | 941,243
Equity securities | 1,142,003 | 1,179,606
Assets, fair value disclosure | 19,098,329 | 18,649,541
Liabilities: |  |
Trading account securities sold but not yet purchased | 68 | 1,169
Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 720,914 | 855,343
Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 3,017,263 | 3,304,133
Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,477,099 | 1,068,075
Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,292,488 | 4,490,565
Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 5,689,125 | 5,595,675
Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,604,111 | 1,214,901
Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 932,672 | 695,403
Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 222,654 | 245,840
Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 926,865 | 684,470
Equity securities | 1,121,579 | 1,153,079
Assets, fair value disclosure | 2,048,444 | 1,837,549
Liabilities: |  |
Trading account securities sold but not yet purchased | 68 | 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 | 926,865 | 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 | 16,801,000 | 16,528,692
Equity securities | 212,614 | 236,183
Equity securities | 20,424 | 26,527
Assets, fair value disclosure | 17,034,038 | 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 | 720,914 | 855,343
Level 2 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 3,017,263 | 3,304,133
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,477,099 | 1,068,075
Level 2 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,292,488 | 4,490,565
Level 2 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 5,689,125 | 5,595,675
Level 2 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,604,111 | 1,214,901
Level 2 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 1,256 | 1,639
Level 2 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 211,358 | 234,544
Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 15,847 | 20,590
Equity securities | 0 | 0
Assets, fair value disclosure | 15,847 | 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 | 4,551 | 9,294
Level 3 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | $ 11,296 | $ 11,296

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