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Fair Value Measurements (Balances Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | $ 14,977,514 | $ 14,372,732
Equity securities | 10,592,844 | 9,577,871
Short-term investments, available-for-sale | 2,787,758 | 2,571,382
Total Investments | 28,358,116 | 26,521,985
U.S. Treasury securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 4,524,397 | 3,784,713
U.S. government-sponsored enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 1,247,869 | 1,142,814
Obligations of states, municipalities and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 3,792,426 | 4,029,305
Foreign governments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 1,847,879 | 1,783,421
Commercial mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 2,199,628 | 2,243,658
Residential mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 412,450 | 470,422
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 952,865 | 918,399
Fair value, recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 14,977,514 | 14,372,732
Equity securities | 10,592,844 | 9,577,871
Short-term investments, available-for-sale | 2,787,758 | 2,571,382
Total Investments | 28,358,116 | 26,521,985
Fair value, recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Equity securities | 10,591,523 | 9,576,877
Short-term investments, available-for-sale | 2,633,686 | 2,402,099
Total Investments | 13,225,209 | 11,978,976
Fair value, recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 14,977,514 | 14,372,732
Equity securities | 0 | 0
Short-term investments, available-for-sale | 154,072 | 169,283
Total Investments | 15,131,586 | 14,542,015
Fair value, recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Equity securities | 1,321 | 994
Short-term investments, available-for-sale | 0 | 0
Total Investments | 1,321 | 994
Fair value, recurring [Member] | U.S. Treasury securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 4,524,397 | 3,784,713
Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 4,524,397 | 3,784,713
Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 1,247,869 | 1,142,814
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 1,247,869 | 1,142,814
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 3,792,426 | 4,029,305
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 3,792,426 | 4,029,305
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Foreign governments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 1,847,879 | 1,783,421
Fair value, recurring [Member] | Foreign governments [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Foreign governments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 1,847,879 | 1,783,421
Fair value, recurring [Member] | Foreign governments [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 2,199,628 | 2,243,658
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 2,199,628 | 2,243,658
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 412,450 | 470,422
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 412,450 | 470,422
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 952,865 | 918,399
Fair value, recurring [Member] | Corporate bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Corporate bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 952,865 | 918,399
Fair value, recurring [Member] | Corporate bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | 0 | 0
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 4,102,727 | 3,695,369
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 4,101,406 | 3,694,375
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,321 | 994
Fair value, recurring [Member] | Industrial, consumer and all other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 6,490,117 | 5,882,502
Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 6,490,117 | 5,882,502
Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | $ 0 | $ 0

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