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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments, at fair value:      
Equity securities (cost $75,099; $81,802) $ 803,851 $ 724,751  
Short-term investments (cost $4,269; $29,356) 375,609 494,135  
Total investments 4,729,270 4,312,161  
Cash 348,479 294,398  
Accrued investment income 42,985 40,107  
Current income taxes 0 7,642  
Other assets 38,635 44,247  
Total assets 6,328,246 5,889,157  
Liabilities      
Notes payable 372,532 372,133  
Accounts payable and accrued expenses 194,421 143,318  
Deferred income taxes 41,132 27,964  
Other liabilities 236,136 221,442  
Total liabilities 4,295,649 4,089,655  
Shareholders’ equity:      
Common stock 98,970 98,828  
Retained earnings 1,933,627 1,700,674  
Total shareholders’ equity 2,032,597 1,799,502 $ 1,617,684
Total liabilities and shareholders’ equity 6,328,246 5,889,157  
Cost - equity security trading investments 695,150 648,282  
Cost - short-term investments 376,547 494,060  
Parent Company [Member]      
Investments, at fair value:      
Equity securities (cost $75,099; $81,802) 110,596 114,668  
Short-term investments (cost $4,269; $29,356) 4,269 29,356  
Investment in subsidiaries 2,285,417 2,008,163  
Total investments 2,400,282 2,152,187  
Cash 24,652 39,766  
Accrued investment income 20 90  
Amounts receivable from affiliates 250 244  
Income tax receivable from affiliates 5,862 9,192  
Other assets 221 312  
Total assets 2,431,287 2,201,791  
Liabilities      
Notes payable 372,532 372,133  
Accounts payable and accrued expenses 0 17  
Amounts payable to affiliates 30 22  
Income tax payable to affiliates 2,724 4,106  
Current income taxes 10,074 14,052  
Deferred income taxes 8,470 7,059  
Other liabilities 4,860 4,900  
Total liabilities 398,690 402,289  
Shareholders’ equity:      
Common stock 98,970 98,828  
Retained earnings 1,933,627 1,700,674  
Total shareholders’ equity 2,032,597 1,799,502  
Total liabilities and shareholders’ equity 2,431,287 2,201,791  
Cost - equity security trading investments 75,099 81,802  
Cost - short-term investments $ 4,269 $ 29,356