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Condensed Financial Information Of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Investments, at fair value: |  |  |  |
Short-term investments | $ 236,444 | $ 143,371 |  |
Total investments | 3,062,421 | 3,155,257 |  |
Cash | 211,393 | 181,388 | 185,505 | 35,396
Accrued investment income | 32,541 | 36,885 |  |
Current income taxes | 0 | 25,719 |  |
Deferred income taxes | 6,511 | 26,499 |  |
Other assets | 11,232 | 16,502 |  |
Total assets | 4,070,006 | 4,203,364 |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |
Notes payable | 140,000 | 267,210 |  |
Accounts payable and accrued expenses | 94,743 | 106,662 |  |
Other liabilities | 149,007 | 167,093 |  |
Total liabilities | 2,212,523 | 2,408,549 |  |
Shareholders' equity: |  |  |  |
Common stock | 76,634 | 74,188 |  |
Additional paid -in capital | 538 | 78 |  |
Accumulated other comprehensive loss | 0 | (740) |  |
Retained earnings | 1,780,311 | 1,721,289 |  |
Total shareholders' equity | 1,857,483 | 1,794,815 | 1,770,946 |
Total liabilities and shareholders' equity | 4,070,006 | 4,203,364 |  |
Equity securities amortized cost | 388,417 | 336,757 |  |
Cost Short Term Investments | 236,433 | 143,378 |  |
Parent Company [Member] |  |  |  |
Investments, at fair value: |  |  |  |
Equity securities trading | 20,282 | 16,518 |  |
Short-term investments | 26,817 | 5,366 |  |
Investments in subsidiaries | 1,787,047 | 1,591,638 |  |
Total investments | 1,834,146 | 1,613,522 |  |
Cash | 29,219 | 41,606 | 45,344 | 2,389
Accrued investment income | 17 | 13 |  |
Amounts receivable from affiliates | 200 | 189 |  |
Current income taxes | 22 | 25,759 |  |
Deferred income taxes | 1,654 |  |  |
Income tax receivable from affiliates | 12,833 | 3,630 |  |
Dividend receivable from affiliates |  | 270,000 |  |
Other assets |  | 4,745 |  |
Total assets | 1,878,091 | 1,959,464 |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |
Notes payable |  | 129,210 |  |
Accounts payable and accrued expenses | 48 | 43 |  |
Income tax payable to affiliates | 20,288 | 34,464 |  |
Deferred income taxes |  | 193 |  |
Other liabilities | 272 | 739 |  |
Total liabilities | 20,608 | 164,649 |  |
Shareholders' equity: |  |  |  |
Common stock | 76,634 | 74,188 |  |
Additional paid -in capital | 538 | 78 |  |
Accumulated other comprehensive loss |  | (740) |  |
Retained earnings | 1,780,311 | 1,721,289 |  |
Total shareholders' equity | 1,857,483 | 1,794,815 |  |
Total liabilities and shareholders' equity | 1,878,091 | 1,959,464 |  |
Equity securities amortized cost | 24,885 | 18,285 |  |
Cost Short Term Investments | $ 26,817 | $ 5,366 |  |

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