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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Investments, at fair value: |  |  |  |
Short-term investments (cost $29,356; $3,166) | $ 494,135 | $ 253,299 |  |
Total investments | 4,312,161 | 3,768,091 |  |
Cash | 294,398 | 314,291 | $ 291,413 | $ 220,318
Accrued investment income | 40,107 | 45,373 |  |
Current income taxes | 7,642 | 38,885 |  |
Other assets | 44,247 | 45,008 |  |
Total assets | 5,889,157 | 5,433,729 |  |
Liabilities |  |  |  |
Notes payable | 372,133 | 371,734 |  |
Accounts payable and accrued expenses | 143,318 | 115,071 |  |
Deferred income taxes | 27,964 | 0 |  |
Other liabilities | 221,442 | 263,647 |  |
Total liabilities | 4,089,655 | 3,816,045 |  |
Shareholders’ equity: |  |  |  |
Common stock | 98,828 | 98,026 |  |
Retained earnings | 1,700,674 | 1,519,658 |  |
Total shareholders’ equity | 1,799,502 | 1,617,684 | 1,761,387 |
Total liabilities and shareholders’ equity | 5,889,157 | 5,433,729 |  |
Cost - equity security trading investments | 648,282 | 544,082 |  |
Cost - short-term investments | 494,060 | 254,518 |  |
Parent Company [Member] |  |  |  |
Investments, at fair value: |  |  |  |
Equity securities (cost $81,802; $110,279) | 114,668 | 119,037 |  |
Short-term investments (cost $29,356; $3,166) | 29,356 | 3,166 |  |
Investment in subsidiaries | 2,008,163 | 1,850,582 |  |
Total investments | 2,152,187 | 1,972,785 |  |
Cash | 39,766 | 24,140 | $ 8,475 | $ 11,786
Accrued investment income | 90 | 161 |  |
Amounts receivable from affiliates | 244 | 1,172 |  |
Current income taxes | 0 | 0 |  |
Income tax receivable from affiliates | 9,192 | 19,225 |  |
Other assets | 312 | 446 |  |
Total assets | 2,201,791 | 2,017,929 |  |
Liabilities |  |  |  |
Notes payable | 372,133 | 371,734 |  |
Accounts payable and accrued expenses | 17 | 25 |  |
Amounts payable to affiliates | 22 | 3,082 |  |
Income tax payable to affiliates | 4,106 | 580 |  |
Current income taxes | 14,052 | 17,773 |  |
Deferred income taxes | 7,059 | 1,691 |  |
Other liabilities | 4,900 | 5,360 |  |
Total liabilities | 402,289 | 400,245 |  |
Shareholders’ equity: |  |  |  |
Common stock | 98,828 | 98,026 |  |
Retained earnings | 1,700,674 | 1,519,658 |  |
Total shareholders’ equity | 1,799,502 | 1,617,684 |  |
Total liabilities and shareholders’ equity | 2,201,791 | 2,017,929 |  |
Cost - equity security trading investments | 81,802 | 110,279 |  |
Cost - short-term investments | $ 29,356 | $ 3,166 |  |

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