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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 |

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