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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Total fixed maturity securities available for sale | $ 22,619,949 | $ 20,124,936
Equity securities | 1,048,126 | 1,090,347
Arbitrage trading account | 821,000 | 938,000
Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 22,619,949 | 20,124,936
Equity securities | 1,048,126 | 1,090,347
Arbitrage trading account | 820,928 | 938,049
Total | 24,489,003 | 22,153,332
Liabilities: |  |
Trading account securities sold but not yet purchased | 36,093 | 9,357
Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,070,985 | 1,716,731
Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,516,302 | 2,634,422
Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 3,237,972 | 2,266,455
Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,107,321 | 4,187,040
Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 8,852,764 | 7,654,059
Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,834,605 | 1,666,229
Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 701,667 | 838,054
Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 346,459 | 252,293
Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 698,364 | 835,338
Arbitrage trading account | 728,783 | 546,110
Total | 1,427,147 | 1,381,448
Liabilities: |  |
Trading account securities sold but not yet purchased | 36,093 | 9,357
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 | 698,364 | 835,338
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 | 22,619,949 | 20,124,936
Equity securities | 343,953 | 249,756
Arbitrage trading account | 88,397 | 388,167
Total | 23,052,299 | 20,762,859
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 | 2,070,985 | 1,716,731
Level 2 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,516,302 | 2,634,422
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 3,237,972 | 2,266,455
Level 2 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 4,107,321 | 4,187,040
Level 2 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 8,852,764 | 7,654,059
Level 2 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,834,605 | 1,666,229
Level 2 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 1,130 | 1,158
Level 2 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 342,823 | 248,598
Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 5,809 | 5,253
Arbitrage trading account | 3,748 | 3,772
Total | 9,557 | 9,025
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 | 2,173 | 1,558
Level 3 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | $ 3,636 | $ 3,695

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