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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues:        
Net premiums $ 1,912,746,000 $ 1,776,165,000 $ 5,726,889,000 $ 5,300,971,000
Investment income, net of related expenses 396,781,000 268,210,000 1,066,055,000 976,686,000
Investment related gains (losses), net:        
Other-than-temporary impairments on fixed maturity securities (1,996,000) (11,911,000) (11,562,000) (19,049,000)
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income (559,000) 3,089,000 (7,618,000) 3,381,000
Other investment related gains (losses), net 78,608,000 (130,778,000) 162,554,000 27,076,000
Total investment related gains (losses), net 76,053,000 (139,600,000) 143,374,000 11,408,000
Other revenues 63,501,000 90,132,000 181,491,000 192,254,000
Total revenues 2,449,081,000 1,994,907,000 7,117,809,000 6,481,319,000
Benefits and Expenses:        
Claims and other policy benefits 1,662,625,000 1,514,765,000 4,868,220,000 4,504,227,000
Interest credited 130,341,000 35,251,000 285,080,000 237,510,000
Policy Acquisition Costs And Other Insurance Expenses 318,106,000 164,372,000 961,679,000 785,138,000
Other operating expenses 103,786,000 94,029,000 319,425,000 297,340,000
Interest expense 29,749,000 27,025,000 76,431,000 77,412,000
Collateral Financing Expense 2,995,000 3,069,000 8,840,000 9,372,000
Total benefits and expenses 2,247,602,000 1,838,511,000 6,519,675,000 5,910,999,000
Income before income taxes 201,479,000 156,396,000 598,134,000 570,320,000
Provision for income taxes (57,004,000) (21,794,000) (189,230,000) (162,854,000)
Net income $ 144,475,000 $ 134,602,000 $ 408,904,000 $ 407,466,000
Earnings Per Share [Abstract]        
Basic earning per share $ 1.96 $ 1.82 $ 5.55 $ 5.53
Diluted earnings per share $ 1.95 $ 1.81 $ 5.52 $ 5.49
Dividends declared per share $ 0.24 $ 0.18 $ 0.60 $ 0.42