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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | $ 22,353,453 | $ 20,124,936
Arbitrage trading account | 1,123,000 | 938,000
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 22,353,453 | 20,124,936
Equity securities | 1,203,788 | 1,090,347
Arbitrage trading account | 1,122,599 | 938,049
Total | 24,679,840 | 22,153,332
Trading account securities sold but not yet purchased | 73,358 | 9,357
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Equity securities | 757,115 | 835,338
Arbitrage trading account | 1,062,459 | 546,110
Total | 1,819,574 | 1,381,448
Trading account securities sold but not yet purchased | 73,358 | 9,357
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 22,333,786 | 20,124,936
Equity securities | 440,958 | 249,756
Arbitrage trading account | 56,630 | 388,167
Total | 22,831,374 | 20,762,859
Trading account securities sold but not yet purchased | 0 | 0
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 19,667 | 0
Equity securities | 5,715 | 5,253
Arbitrage trading account | 3,510 | 3,772
Total | 28,892 | 9,025
Trading account securities sold but not yet purchased | 0 | 0
Recurring | U.S. government and government agency |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 2,235,341 | 1,716,731
Recurring | U.S. government and government agency | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | U.S. government and government agency | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 2,235,341 | 1,716,731
Recurring | U.S. government and government agency | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | State and municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 2,294,644 | 2,634,422
Recurring | State and municipal | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | State and municipal | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 2,294,644 | 2,634,422
Recurring | State and municipal | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Mortgage- Backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 3,765,490 | 2,266,455
Recurring | Mortgage- Backed | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Mortgage- Backed | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 3,765,490 | 2,266,455
Recurring | Mortgage- Backed | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 3,885,012 | 4,187,040
Recurring | Asset-backed | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Asset-backed | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 3,885,012 | 4,187,040
Recurring | Asset-backed | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 8,417,641 | 7,654,059
Recurring | Corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 8,397,974 | 7,654,059
Recurring | Corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 19,667 | 0
Recurring | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 1,755,325 | 1,666,229
Recurring | Foreign government | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Foreign government | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 1,755,325 | 1,666,229
Recurring | Foreign government | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Common stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 760,167 | 838,054
Recurring | Common stocks | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 757,115 | 835,338
Recurring | Common stocks | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,011 | 1,158
Recurring | Common stocks | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 2,041 | 1,558
Recurring | Preferred stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 443,621 | 252,293
Recurring | Preferred stocks | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring | Preferred stocks | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 439,947 | 248,598
Recurring | Preferred stocks | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | $ 3,674 | $ 3,695

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