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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash Flows from Operating Activities:    
Net income $ 264,429 $ 272,864
Change in operating assets and liabilities:    
Accrued investment income (38,182) (31,378)
Premiums receivable and other reinsurance balances (47,370) 66,922
Deferred policy acquisition costs (63,690) 61,339
Reinsurance ceded balances (540) (11,307)
Future policy benefits, other policy claims and benefits, and other reinsurance balances 755,790 332,611
Total deferred income taxes (5,469) (42,189)
Other assets and other liabilities, net 62,682 41,262
Amortization of net investment premiums, discounts and other (69,347) (67,755)
Investment related gains, net (67,321) (151,008)
Excess tax benefits from share-based payment arrangement 24 (2,690)
Other, net 27,251 69,143
Net cash provided by operating activities 818,257 537,814
Cash Flows from Investing Activities:    
Sales of fixed maturity securities available-for-sale 1,759,932 1,791,826
Maturities of fixed maturity securities available-for-sale 104,008 164,043
Purchases of fixed maturity securities available-for-sale (2,518,580) (2,341,291)
Cash invested in mortgage loans (225,005) (44,679)
Cash invested in policy loans (1,589) (8,928)
Cash invested in funds withheld at interest (60,145) (10,563)
Principal payments on mortgage loans on real estate 46,313 19,283
Principal payments on policy loans 11,752 7,683
Change in short-term investments and other invested assets 98,530 (74,600)
Net cash used in investing activities (784,784) (497,226)
Cash Flows from Financing Activities:    
Dividends to stockholders (26,524) (17,703)
Proceeds From Issuance Of Long Term Debt 0 394,410
Repurchase of long-term debt 0 (7,586)
Net repayments under credit agreements 0 0
Proceeds from redemption and remarketing of trust preferred securities 0 154,588
Maturity of trust preferred securities 0 159,455
Purchases of treasury stock (6,924) (340,220)
Excess tax benefits from share-based payment arrangement (24) 2,690
Exercise of stock options, net (651) 15,605
Change in cash collateral for derivative positions (15,096) 8,010
Deposits on universal life and other investment type policies and contracts 79,134 288,424
Withdrawals on universal life and other investment type policies and contracts 70,753 147,774
Net cash used in financing activities (40,838) 190,989
Effect of exchange rate changes on cash 1,836 15,735
Change in cash and cash equivalents (5,529) 247,312
Cash and cash equivalents, beginning of period 962,870 463,661
Cash and cash equivalents, end of period 957,341 710,973
Supplementary information:    
Cash paid for interest 49,094 47,054
Cash paid for income taxes, net of refunds $ 40,735 $ 105,107