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Condensed Financial Information Of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 140,947 | $ 143,814 | $ 144,949
Net realized investment (losses) gains |  |  |  |  |  |  |  |  | 58,397 | 57,089 | 346,444
Total revenues |  |  |  |  |  |  |  |  | 2,777,285 | 2,775,885 | 3,121,493
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 215,711 | 255,358 | 217,683
Interest |  |  |  |  |  |  |  |  | 5,549 | 6,806 | 6,729
Total expenses |  |  |  |  |  |  |  |  | 2,532,186 | 2,593,495 | 2,549,952
(Loss) income before income taxes and equity in net income of subsidiaries | 110,693 | (18,118) | 75,613 | 76,911 | (50,097) | 135,839 | 15,358 | 81,290 | 245,099 | 182,390 | 571,541
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 53,935 | 30,192 | 168,469
Net income | 79,469 | (3,782) | 57,251 | 58,226 | (23,647) | 96,849 | 17,817 | 61,179 | 191,164 | 152,198 | 403,072
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,411 | 951 | 1,127
Net realized investment (losses) gains |  |  |  |  |  |  |  |  | (1,866) | 1,420 | 6,373
Total revenues |  |  |  |  |  |  |  |  | (455) | 2,371 | 7,500
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 2,267 | 12,945 | 2,565
Interest |  |  |  |  |  |  |  |  | 1,341 | 2,180 | 2,245
Total expenses |  |  |  |  |  |  |  |  | 3,608 | 15,125 | 4,810
(Loss) income before income taxes and equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (4,063) | (12,754) | 2,690
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (684) | (3,507) | 4,400
Loss before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (3,379) | (9,247) | (1,710)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 194,543 | 161,445 | 404,782
Net income |  |  |  |  |  |  |  |  | $ 191,164 | $ 152,198 | $ 403,072

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