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v3.23.2

Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Total fixed maturity securities available for sale | $ 18,003,312 | $ 17,536,053
Equity securities | 1,239,712 | 1,185,894
Arbitrage trading account | 724,000 | 944,000
Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 18,003,312 | 17,536,053
Equity securities | 1,239,712 | 1,185,894
Arbitrage trading account | 723,967 | 944,230
Total | 19,966,991 | 19,666,177
Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,238,117 | 892,258
Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,703,044 | 2,890,098
Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,903,672 | 1,665,410
Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 3,743,803 | 3,982,773
Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 7,007,068 | 6,703,992
Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,407,608 | 1,401,522
Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 1,014,820 | 982,751
Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 224,892 | 203,143
Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 1,011,449 | 978,991
Arbitrage trading account | 610,553 | 822,192
Total | 1,622,002 | 1,801,183
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 | 1,011,449 | 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 | 18,003,312 | 17,536,053
Equity securities | 214,746 | 193,005
Arbitrage trading account | 109,749 | 118,448
Total | 18,327,807 | 17,847,506
Level 2 | Fair Value, Measurements, Recurring | U.S. government and government agency |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,238,117 | 892,258
Level 2 | Fair Value, Measurements, Recurring | State and municipal |  |
Assets: |  |
Total fixed maturity securities available for sale | 2,703,044 | 2,890,098
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,903,672 | 1,665,410
Level 2 | Fair Value, Measurements, Recurring | Asset-backed |  |
Assets: |  |
Total fixed maturity securities available for sale | 3,743,803 | 3,982,773
Level 2 | Fair Value, Measurements, Recurring | Corporate |  |
Assets: |  |
Total fixed maturity securities available for sale | 7,007,068 | 6,703,992
Level 2 | Fair Value, Measurements, Recurring | Foreign government |  |
Assets: |  |
Total fixed maturity securities available for sale | 1,407,608 | 1,401,522
Level 2 | Fair Value, Measurements, Recurring | Common stocks |  |
Assets: |  |
Equity securities | 1,153 | 1,161
Level 2 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | 213,593 | 191,844
Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total fixed maturity securities available for sale | 0 | 0
Equity securities | 13,517 | 13,898
Arbitrage trading account | 3,665 | 3,590
Total | 17,182 | 17,488
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 | 2,218 | 2,599
Level 3 | Fair Value, Measurements, Recurring | Preferred stocks |  |
Assets: |  |
Equity securities | $ 11,299 | $ 11,299

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