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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 |  |  |

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