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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Investments [Abstract] |  |  |
Fixed maturity securities (amortized cost $0; $9,979) | $ 4,913,378 | $ 4,319,336 |
Equity securities (cost $17,551; $17,227) | 879,175 | 730,693 |
Short-term investments (cost $78; $571) | 283,817 | 178,491 |
Total investments | 6,076,370 | 5,228,520 |
Cash | 720,257 | 550,903 |
Accrued investment income | 67,630 | 59,128 |
Current income taxes | 0 | 4,081 |
Deferred income taxes | 45,854 | 33,013 |
Other assets | 81,620 | 57,915 |
Total assets | 8,310,632 | 7,103,397 |
Liabilities |  |  |
Notes payable | 574,128 | 573,729 |
Current income taxes | 20,752 | 0 |
Other liabilities | 321,669 | 270,711 |
Total liabilities | 6,364,108 | 5,555,252 |
Commitments and contingencies |  |  |
Shareholders’ equity: |  |  |
Common stock | 99,699 | 98,947 |
Retained earnings | 1,846,825 | 1,449,198 |
Total shareholders’ equity | 1,946,524 | 1,548,145 | $ 1,522,131
Total liabilities and shareholders’ equity | 8,310,632 | 7,103,397 |
Amortized cost on fixed maturities trading investments | 4,982,459 | 4,394,983 |
Cost - equity security trading investments | 795,068 | 654,939 |
Cost - short-term investments | 283,792 | 179,375 |
Parent Company |  |  |
Investments [Abstract] |  |  |
Fixed maturity securities (amortized cost $0; $9,979) | 0 | 9,949 |
Equity securities (cost $17,551; $17,227) | 29,387 | 28,027 |
Short-term investments (cost $78; $571) | 78 | 571 |
Investment in subsidiaries | 2,476,777 | 2,084,346 |
Total investments | 2,506,242 | 2,122,893 |
Cash | 19,316 | 4,698 |
Accrued investment income | 12 | 141 |
Current income taxes | 0 | 5,148 |
Deferred income taxes | 0 | 1,544 |
Other assets | 1,233 | 1,499 |
Total assets | 2,574,699 | 2,151,587 |
Liabilities |  |  |
Current income taxes | 19,195 | 0 |
Deferred income taxes | 4,837 | 0 |
Other liabilities | 5,867 | 5,751 |
Total liabilities | 628,175 | 603,442 |
Commitments and contingencies |  |  |
Shareholders’ equity: |  |  |
Common stock | 99,699 | 98,947 |
Retained earnings | 1,846,825 | 1,449,198 |
Total shareholders’ equity | 1,946,524 | 1,548,145 |
Total liabilities and shareholders’ equity | 2,574,699 | 2,151,587 |
Amortized cost on fixed maturities trading investments | 0 | 9,979 |
Cost - equity security trading investments | 17,551 | 17,227 |
Cost - short-term investments | 78 | 571 |
Parent Company | Affiliated Entity |  |  |
Investments [Abstract] |  |  |
Amounts receivable | 17,037 | 503 |
Income tax receivable | 30,859 | 15,161 |
Liabilities |  |  |
Notes payable | 14,274 | 2,753 |
Income tax payable | 9,874 | 21,209 |
Parent Company | Nonrelated Party |  |  |
Liabilities |  |  |
Notes payable | $ 574,128 | $ 573,729 |

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