CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Net premiums	$ 1,788,676	$ 1,582,017	$ 3,524,806	$ 3,210,481
Investment income, net of related expenses	337,436	291,671	708,476	595,929
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	(5,582)	(3,489)	(7,138)	(10,919)
Other Than Temporary Impairments On Fixed Maturity Securities Transferred To Other Comprehensive Loss	292	(139)	292	2,205
Other investment related gains (losses), net	32,678	26,620	157,854	162,891
Total investment related gains (losses), net	27,388	22,992	151,008	154,177
Other revenues	50,477	35,197	102,122	71,475
Total revenues	2,203,977	1,931,877	4,486,412	4,032,062
Benefits and Expenses:
Claims and other policy benefits	1,520,013	1,307,239	2,989,462	2,682,419
Interest credited	96,196	79,169	202,259	136,103
Policy Acquisition Costs And Other Insurance Expenses	261,282	237,149	592,435	603,451
Other operating expenses	97,161	83,147	203,311	174,346
Interest expense	25,818	25,141	50,387	40,590
Collateral Financing Expense	3,101	1,960	6,303	3,766
Total benefits and expenses	2,003,571	1,733,805	4,044,157	3,640,675
Income before income taxes	200,406	198,072	442,255	391,387
Provision for income taxes	(67,518)	(71,053)	(148,551)	(141,929)
Net income	$ 132,888	$ 127,019	$ 293,704	$ 249,458
Earnings per share:
Basic earning per share	$ 1.80	$ 1.74	$ 3.99	$ 3.41
Diluted earnings per share	$ 1.78	$ 1.70	$ 3.96	$ 3.34
Dividends declared per share	$ 0.12	$ 0.12	$ 0.24	$ 0.24

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Income Loss From Continuing Operations Before Provision For Income Tax

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Other Than Temporary Impairments On Fixed Maturity Securities Transferred To Other Comprehensive Loss

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Policy Acquisition Costs And Other Insurance Expenses

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The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings.

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Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield.

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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The income earned from investments in securities and property, equipment and other capital assets. It includes rent from property and equipment, dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It does not include realized gains and losses on investments.

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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

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Provision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts assumed and ceded.

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Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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