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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
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