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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments, at fair value:          
Fixed maturity securities $ 2,892,777 $ 2,814,553      
Equity securities 537,240 357,327      
Short-term investments 302,711 375,680      
Total investments 3,732,728 3,547,560      
Cash 291,413 220,318 $ 264,221 $ 289,907  
Accrued investment income 39,368 41,205      
Current income taxes 61,257 0      
Deferred income taxes 0 45,277      
Other assets 32,592 25,414      
Total assets 5,101,323 4,788,718      
Liabilities          
Notes payable 371,335 320,000      
Accounts payable and accrued expenses 108,252 112,334      
Current income taxes 0 9,962      
Deferred income taxes 22,932 0      
Other liabilities 224,877 229,335      
Total liabilities 3,339,936 3,036,316      
Shareholders’ equity:          
Common stock 97,523 95,529      
Retained earnings 1,663,864 1,656,873      
Total shareholders’ equity 1,761,387 1,752,402 $ 1,820,885    
Total liabilities and shareholders’ equity 5,101,323 4,788,718      
Amortized cost on fixed maturities trading investments 2,823,230 2,795,410      
Cost - equity security trading investments 474,197 331,770      
Cost - short-term investments 302,693 375,700      
Parent Company [Member]          
Investments, at fair value:          
Fixed maturity securities 0 1,605      
Equity securities 141,227 122,717      
Short-term investments 21,231 629      
Investment in subsidiaries 1,976,400 1,810,663      
Total investments 2,138,858 1,935,614      
Cash 8,475 11,786   $ 20,139 $ 52,326
Accrued investment income 178 189      
Amounts receivable from affiliates 231 226      
Current income taxes 8,857 0      
Deferred income taxes 0 2,702      
Income tax receivable from affiliates 6,338 35,237      
Other assets 663 414      
Total assets 2,163,600 1,986,168      
Liabilities          
Notes payable 371,335 180,000      
Accounts payable and accrued expenses 0 348      
Amounts payable to affiliates 507 36      
Income tax payable to affiliates 17,213 39,539      
Current income taxes 0 10,200      
Deferred income taxes 8,242 0      
Other liabilities 4,916 3,643      
Total liabilities 402,213 233,766      
Shareholders’ equity:          
Common stock 97,523 95,529      
Retained earnings 1,663,864 1,656,873      
Total shareholders’ equity 1,761,387 1,752,402      
Total liabilities and shareholders’ equity 2,163,600 1,986,168      
Amortized cost on fixed maturities trading investments 0 1,609      
Cost - equity security trading investments 113,216 113,943      
Cost - short-term investments $ 21,233 $ 629