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Fair Value Measurements (Balances Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | $ 16,277,629 | $ 15,745,539
Equity securities | 11,697,643 | 11,784,521
Short-term investments, available-for-sale | 2,099,033 | 2,524,910
Total Investments | 30,074,305 | 30,054,970
Fixed Maturity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 16,277,629 | 15,745,539
U.S. Treasury securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 5,263,681 | 5,087,858
U.S. government-sponsored enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 1,429,318 | 1,346,236
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 securities, estimated fair value | 3,639,372 | 3,619,492
Foreign governments, agencies and supranationals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 2,932,803 | 2,706,523
Agency mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 2,698,872 | 2,649,813
Non-agency mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 101,954 | 118,030
Corporate and university bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 211,629 | 217,587
Fair value, recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 16,277,629 | 15,745,539
Equity securities | 11,697,643 | 11,784,521
Short-term investments, available-for-sale | 2,099,033 | 2,524,910
Total Investments | 30,074,305 | 30,054,970
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 securities, estimated fair value | 0 | 0
Equity securities | 11,697,643 | 11,783,137
Short-term investments, available-for-sale | 1,949,450 | 2,363,736
Total Investments | 13,647,093 | 14,146,873
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 securities, estimated fair value | 16,277,629 | 15,745,539
Equity securities | 0 | 0
Short-term investments, available-for-sale | 149,583 | 161,174
Total Investments | 16,427,212 | 15,906,713
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 securities, estimated fair value | 0 | 0
Equity securities | 0 | 1,384
Short-term investments, available-for-sale | 0 | 0
Total Investments | 0 | 1,384
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 securities, estimated fair value | 5,263,681 | 5,087,858
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 securities, 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 securities, estimated fair value | 5,263,681 | 5,087,858
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 securities, 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 securities, estimated fair value | 1,429,318 | 1,346,236
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 securities, 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 securities, estimated fair value | 1,429,318 | 1,346,236
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 securities, 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 securities, estimated fair value | 3,639,372 | 3,619,492
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 securities, 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 securities, estimated fair value | 3,639,372 | 3,619,492
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 securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 2,932,803 | 2,706,523
Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 2,932,803 | 2,706,523
Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Agency mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 2,698,872 | 2,649,813
Fair value, recurring [Member] | Agency mortgage-backed securities | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Agency mortgage-backed securities | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 2,698,872 | 2,649,813
Fair value, recurring [Member] | Agency mortgage-backed securities | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Non-agency mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 101,954 | 118,030
Fair value, recurring [Member] | Non-agency mortgage-backed securities | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Non-agency mortgage-backed securities | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 101,954 | 118,030
Fair value, recurring [Member] | Non-agency mortgage-backed securities | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Corporate and university bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 211,629 | 217,587
Fair value, recurring [Member] | Corporate and university bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 0 | 0
Fair value, recurring [Member] | Corporate and university bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, estimated fair value | 211,629 | 217,587
Fair value, recurring [Member] | Corporate and university bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale fixed maturity securities, 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 | 5,116,230 | 4,970,120
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 | 5,116,230 | 4,968,736
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 | 0 | 1,384
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 | 6,581,413 | 6,814,401
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 | 6,581,413 | 6,814,401
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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