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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
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