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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Total fixed maturity securities available for sale | $ 18,982,477 | $ 17,536,053
Equity securities | 1,182,061 | 1,185,894
Arbitrage trading account | 825,000 | 944,000
Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 18,982,477 | 17,536,053
Equity securities | 1,182,061 | 1,185,894
Arbitrage trading account | 825,049 | 944,230
Total | 20,989,587 | 19,666,177
Liabilities: |  |
Trading account securities sold but not yet purchased | 7,538 | 0
Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,467,199 | 892,258
Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,670,998 | 2,890,098
Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,076,296 | 1,665,410
Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,087,458 | 3,982,773
Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 7,248,814 | 6,703,992
Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,431,712 | 1,401,522
Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 961,433 | 982,751
Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 220,628 | 203,143
Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 958,202 | 978,991
Arbitrage trading account | 614,995 | 822,192
Total | 1,573,197 | 1,801,183
Liabilities: |  |
Trading account securities sold but not yet purchased | 7,538 | 0
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 | 958,202 | 978,991
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 | 18,982,477 | 17,536,053
Equity securities | 217,990 | 193,005
Arbitrage trading account | 206,536 | 118,448
Total | 19,407,003 | 17,847,506
Liabilities: |  |
Trading account securities sold but not yet purchased | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,467,199 | 892,258
Level 2 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,670,998 | 2,890,098
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,076,296 | 1,665,410
Level 2 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,087,458 | 3,982,773
Level 2 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 7,248,814 | 6,703,992
Level 2 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,431,712 | 1,401,522
Level 2 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 1,060 | 1,161
Level 2 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 216,930 | 191,844
Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 5,869 | 13,898
Arbitrage trading account | 3,518 | 3,590
Total | 9,387 | 17,488
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 | 2,171 | 2,599
Level 3 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | $ 3,698 | $ 11,299

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