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Fair Value Measurements (Balances Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity investments, estimated fair value | $ 12,951,279 | $ 11,856,835
Equity securities | 8,574,957 | 7,671,912
Short-term investments, available-for-sale | 2,252,726 | 2,669,262
Total Investments | 23,778,962 | 22,198,009
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 | 3,310,829 | 2,913,959
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 | 995,684 | 765,538
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 | 3,798,946 | 3,733,183
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 | 1,563,119 | 1,306,778
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 | 2,089,373 | 1,940,448
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 | 478,840 | 526,793
Asset-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 | 1,198 | 1,640
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 | 713,290 | 668,496
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 | 12,951,279 | 11,856,835
Equity securities | 8,574,957 | 7,671,912
Short-term investments, available-for-sale | 2,252,726 | 2,669,262
Total Investments | 23,778,962 | 22,198,009
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 | 8,574,015 | 7,671,013
Short-term investments, available-for-sale | 2,085,072 | 2,510,164
Total Investments | 10,659,087 | 10,181,177
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 | 12,951,279 | 11,856,835
Equity securities | 0 | 0
Short-term investments, available-for-sale | 167,654 | 159,098
Total Investments | 13,118,933 | 12,015,933
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 | 942 | 899
Short-term investments, available-for-sale | 0 | 0
Total Investments | 942 | 899
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 | 3,310,829 | 2,913,959
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 | 3,310,829 | 2,913,959
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 | 995,684 | 765,538
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 | 995,684 | 765,538
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 | 3,798,946 | 3,733,183
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 | 3,798,946 | 3,733,183
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 | 1,563,119 | 1,306,778
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 | 1,563,119 | 1,306,778
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 | 2,089,373 | 1,940,448
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 | 2,089,373 | 1,940,448
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 | 478,840 | 526,793
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 | 478,840 | 526,793
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] | Asset-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 | 1,198 | 1,640
Fair value, recurring [Member] | Asset-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] | Asset-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 | 1,198 | 1,640
Fair value, recurring [Member] | Asset-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 | 713,290 | 668,496
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 | 713,290 | 668,496
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 | 3,305,241 | 2,953,588
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 | 3,304,299 | 2,952,689
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 | 942 | 899
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 | 5,269,716 | 4,718,324
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 | 5,269,716 | 4,718,324
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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