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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash Flows from Operating Activities:    
Net income $ 408,904,000 $ 407,466,000
Change in operating assets and liabilities:    
Accrued investment income (60,684,000) (64,464,000)
Premiums receivable and other reinsurance balances (102,447,000) (86,339,000)
Deferred policy acquisition costs (70,107,000) (60,792,000)
Reinsurance ceded balances 2,240,000 42,409,000
Future policy benefits, other policy claims and benefits, and other reinsurance balances 1,406,844,000 669,174,000
Total deferred income taxes (99,200,000) 58,207,000
Other assets and other liabilities, net 225,749,000 (46,320,000)
Amortization of net investment premiums, discounts and other (61,644,000) (100,328,000)
Investment related gains, net (143,374,000) (11,408,000)
Gains Losses On Extinguishment Of Collateral Finance Securities 0 (55,840,000)
Excess tax benefits from share-based payment arrangement 262,000 (4,418,000)
Other, net 22,533,000 86,630,000
Net cash provided by operating activities 1,529,076,000 833,977,000
Cash Flows from Investing Activities:    
Sales of fixed maturity securities available-for-sale 3,970,569,000 2,338,405,000
Maturities of fixed maturity securities available-for-sale 122,405,000 195,582,000
Purchases of fixed maturity securities available-for-sale (4,660,131,000) (3,104,714,000)
Cash invested in mortgage loans (350,823,000) (117,697,000)
Cash invested in policy loans (8,032,000) (8,928,000)
Cash invested in funds withheld at interest (81,602,000) (23,784,000)
Principal payments on mortgage loans on real estate 85,921,000 60,764,000
Principal payments on policy loans 24,934,000 8,456,000
Change in short-term investments and other invested assets (129,874,000) (86,895,000)
Net cash used in investing activities (1,026,633,000) (738,811,000)
Cash Flows from Financing Activities:    
Dividends to stockholders (44,220,000) (31,039,000)
Proceeds From Issuance Of Long Term Debt 400,000,000 397,788,000
Repurchase of long-term debt 0 (111,831,000)
Payments of Debt Issuance Costs 6,255,000 3,400,000
Proceeds from redemption and remarketing of trust preferred securities 0 154,588,000
Maturity of trust preferred securities 0 159,473,000
Purchases of treasury stock (6,924,000) (380,345,000)
Excess tax benefits from share-based payment arrangement (262,000) 4,418,000
Exercise of stock options, net 4,096,000 8,680,000
Change in cash collateral for derivative positions (62,896,000) 163,250,000
Deposits on universal life and other investment type policies and contracts 89,458,000 328,903,000
Withdrawals on universal life and other investment type policies and contracts 249,190,000 119,180,000
Net cash used in financing activities 123,807,000 252,359,000
Effect of exchange rate changes on cash 14,610,000 (8,535,000)
Change in cash and cash equivalents 640,860,000 338,990,000
Cash and cash equivalents, beginning of period 962,870,000 463,661,000
Cash and cash equivalents, end of period 1,603,730,000 802,651,000
Supplementary information:    
Cash paid for interest 76,514,000 57,821,000
Cash paid for income taxes, net of refunds $ 81,391,000 $ 110,075,000