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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues:    
Net premiums $ 1,979,693,000 $ 1,863,482,000
Investment income, net of related expenses 425,131,000 340,940,000
Investment related gains (losses), net:    
Other-than-temporary impairments on fixed maturity securities (202,000) (7,607,000)
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income 0 (7,221,000)
Other investment related gains (losses), net 94,573,000 58,348,000
Total investment related gains (losses), net 94,371,000 43,520,000
Other revenues 101,907,000 45,033,000
Total revenues 2,601,102,000 2,292,975,000
Benefits and Expenses:    
Claims and other policy benefits 1,688,910,000 1,580,149,000
Interest credited 125,483,000 88,042,000
Policy Acquisition Costs And Other Insurance Expenses 357,357,000 307,634,000
Other operating expenses 119,501,000 110,098,000
Interest expense 28,486,000 23,322,000
Collateral Financing Expense 2,538,000 2,967,000
Total benefits and expenses 2,322,275,000 2,112,212,000
Income before income taxes 278,827,000 180,763,000
Provision for income taxes (93,292,000) (57,445,000)
Net income $ 185,535,000 $ 123,318,000
Earnings Per Share [Abstract]    
Basic earning per share $ 2.51 $ 1.68
Diluted earnings per share $ 2.49 $ 1.67
Dividends declared per share $ 0.24 $ 0.18