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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | $ 17,536,053 | $ 16,528,692
Arbitrage trading account | 944,000 | 1,180,000
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 17,536,053 | 16,528,692
Equity securities | 1,185,894 | 941,243
Arbitrage trading account | 944,230 | 1,179,606
Total | 19,666,177 | 18,649,541
Trading account securities sold but not yet purchased | 0 | 1,169
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 | 978,991 | 684,470
Arbitrage trading account | 822,192 | 1,153,079
Total | 1,801,183 | 1,837,549
Trading account securities sold but not yet purchased | 0 | 1,137
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 17,536,053 | 16,528,692
Equity securities | 193,005 | 236,183
Arbitrage trading account | 118,448 | 26,527
Total | 17,847,506 | 16,791,402
Trading account securities sold but not yet purchased | 0 | 32
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 | 13,898 | 20,590
Arbitrage trading account | 3,590 | 0
Total | 17,488 | 20,590
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 | 892,258 | 855,343
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 | 892,258 | 855,343
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 | 2,890,098 | 3,304,133
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 | 2,890,098 | 3,304,133
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 | 1,665,410 | 1,068,075
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 | 1,665,410 | 1,068,075
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 securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 3,982,773 | 4,490,565
Recurring | Asset-backed securities | 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 securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 3,982,773 | 4,490,565
Recurring | Asset-backed securities | 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 | 6,703,992 | 5,595,675
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 | 6,703,992 | 5,595,675
Recurring | Corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale |  | 0
Recurring | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities available for sale | 1,401,522 | 1,214,901
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 | 1,401,522 | 1,214,901
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 | 982,751 | 695,403
Recurring | Common stocks | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 978,991 | 684,470
Recurring | Common stocks | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,161 | 1,639
Recurring | Common stocks | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 2,599 | 9,294
Recurring | Preferred stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 203,143 | 245,840
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 | 191,844 | 234,544
Recurring | Preferred stocks | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | $ 11,299 | $ 11,296

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