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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | $ 20,124,936 | $ 17,536,053
Arbitrage trading account | 938,000 | 944,000
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 20,124,936 | 17,536,053
Equity securities | 1,090,347 | 1,185,894
Arbitrage trading account | 938,049 | 944,230
Total | 22,153,332 | 19,666,177
Trading account securities sold but not yet purchased | 9,357 | 0
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 | 835,338 | 978,991
Arbitrage trading account | 546,110 | 822,192
Total | 1,381,448 | 1,801,183
Trading account securities sold but not yet purchased | 9,357 | 0
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 20,124,936 | 17,536,053
Equity securities | 249,756 | 193,005
Arbitrage trading account | 388,167 | 118,448
Total | 20,762,859 | 17,847,506
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 | 0 | 0
Equity securities | 5,253 | 13,898
Arbitrage trading account | 3,772 | 3,590
Total | 9,025 | 17,488
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 | 1,716,731 | 892,258
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 | 1,716,731 | 892,258
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 | 2,634,422 | 2,890,098
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 | 2,634,422 | 2,890,098
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 | 2,266,455 | 1,665,410
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 | 2,266,455 | 1,665,410
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 | 4,187,040 | 3,982,773
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 | 4,187,040 | 3,982,773
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 | 7,654,059 | 6,703,992
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 | 7,654,059 | 6,703,992
Recurring | Corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 0 | 0
Recurring | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 1,666,229 | 1,401,522
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 | 1,666,229 | 1,401,522
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 | 838,054 | 982,751
Recurring | Common stocks | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 835,338 | 978,991
Recurring | Common stocks | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,158 | 1,161
Recurring | Common stocks | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,558 | 2,599
Recurring | Preferred stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 252,293 | 203,143
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 | 248,598 | 191,844
Recurring | Preferred stocks | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | $ 3,695 | $ 11,299

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