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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities:      
Net income $ 631,893,000 $ 546,045,000 $ 535,742,000
Change in operating assets and liabilities:      
Accrued investment income (12,088,000) (17,426,000) (18,363,000)
Premiums receivable and other reinsurance balances (285,193,000) (83,650,000) (111,451,000)
Deferred policy acquisition costs (65,050,000) (241,903,000) 61,828,000
Reinsurance ceded balances 5,293,000 143,505,000 (53,219,000)
Future policy benefits, other policy claims and benefits, and other reinsurance balances 1,792,207,000 970,685,000 1,580,458,000
Deferred income taxes 198,112,000 168,994,000 425,174,000
Other assets and other liabilities, net (37,831,000) (104,423,000) (253,679,000)
Amortization of net investment premiums, discounts and other (83,787,000) (172,688,000) (144,334,000)
Investment related gains, net (254,136,000) 36,056,000 (212,030,000)
Gain on repurchase of long-term debt 0 (65,565,000) 0
Excess tax benefits from share-based payment arrangement (416,000) (4,933,000) 2,255,000
Other, net 85,523,000 134,835,000 30,359,000
Net cash provided by operating activities 1,974,527,000 1,309,532,000 1,842,740,000
Cash Flows from Investing Activities:      
Sales of fixed maturity securities available-for-sale 5,465,014,000 3,165,479,000 3,319,453,000
Maturities of fixed maturity securities available-for-sale 145,423,000 218,696,000 150,687,000
Purchases of fixed maturity securities available-for-sale (6,818,378,000) (4,011,985,000) (4,854,416,000)
Cash invested in mortgage loans (491,466,000) (209,194,000) (132,801,000)
Cash invested in policy loans (58,240,000) (61,073,000) (95,163,000)
Cash invested in funds withheld at interest (107,289,000) (37,721,000) (103,578,000)
Principal payments on mortgage loans on real estate 173,962,000 92,806,000 29,422,000
Principal payments on policy loans 40,466,000 29,091,000 3,309,000
Change in short-term investments and other invested assets (317,488,000) (91,880,000) (37,395,000)
Net cash used in investing activities (1,967,996,000) (905,781,000) (1,720,482,000)
Cash Flows from Financing Activities:      
Dividends to stockholders (61,945,000) (44,229,000) (35,170,000)
Proceeds From Issuance Of Long Term Debt 400,000,000 397,788,000 0
PaymentsOfDebtIssuanceCosts (6,255,000) (3,400,000) 0
Net repayments under credit agreements 0 0 0
Purchases of treasury stock (6,924,000) (380,345,000) (718,000)
Excess tax benefits from share-based payment arrangement 416,000 4,933,000 (2,255,000)
Exercise of stock options, net (3,087,000) 6,449,000 2,277,000
Change in cash collateral for derivative positions (132,933,000) 231,180,000 26,324,000
Proceeds From Annuities And Investment Certificates 457,711,000 367,771,000 124,482,000
Repayments Of Annuities And Investment Certificates (365,044,000) (142,469,000) (308,369,000)
Proceeds from redemption and remarketing of trust preferred securities 0 154,588,000 0
Maturity of trust preferred securities 0 159,473,000 0
Repayments of Secured Debt 0 130,798,000 0
Maturities of Senior Debt 0 200,000,000  
Early Repayment of Subordinated Debt     0
Net cash used in financing activities 281,939,000 101,995,000 (193,429,000)
Effect of exchange rate changes on cash 8,552,000 (6,537,000) 22,805,000
Change in cash and cash equivalents 297,022,000 499,209,000 (48,366,000)
Cash and cash equivalents, beginning of period 962,870,000 463,661,000 512,027,000
Cash and cash equivalents, end of period 1,259,892,000 962,870,000 463,661,000
Supplementary information:      
Cash paid for interest 100,984,000 100,733,000 95,939,000
Cash paid for income taxes, net of refunds $ 97,000,000 $ 129,009,000 $ 10,452,000