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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues:        
Net premiums $ 1,950,661 $ 1,788,676 $ 3,814,143 $ 3,524,806
Investment income, net of related expenses 328,334 337,436 669,274 708,476
Investment related gains (losses), net:        
Other-than-temporary impairments on fixed maturity securities (1,959) (5,582) (9,566) (7,138)
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income 162 292 (7,059) 292
Other investment related gains (losses), net 25,598 32,678 83,946 157,854
Total investment related gains (losses), net 23,801 27,388 67,321 151,008
Other revenues 72,957 50,477 117,990 102,122
Total revenues 2,375,753 2,203,977 4,668,728 4,486,412
Benefits and Expenses:        
Claims and other policy benefits 1,625,446 1,520,013 3,205,595 2,989,462
Interest credited 66,697 96,196 154,739 202,259
Policy Acquisition Costs And Other Insurance Expenses 335,939 274,519 643,573 620,766
Other operating expenses 105,541 97,161 215,639 203,311
Interest expense 23,360 25,818 46,682 50,387
Collateral Financing Expense 2,878 3,101 5,845 6,303
Total benefits and expenses 2,159,861 2,016,808 4,272,073 4,072,488
Income before income taxes 215,892 187,169 396,655 413,924
Provision for income taxes (74,781) (63,225) (132,226) (141,060)
Net income $ 141,111 $ 123,944 $ 264,429 $ 272,864
Earnings Per Share [Abstract]        
Basic earning per share $ 1.91 $ 1.68 $ 3.59 $ 3.71
Diluted earnings per share $ 1.91 $ 1.66 $ 3.57 $ 3.68
Dividends declared per share $ 0.18 $ 0.12 $ 0.36 $ 0.24