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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash Flows from Operating Activities:    
Net income (loss) $ 135,923 $ 264,429
Change in operating assets and liabilities:    
Accrued investment income (35,457) (38,182)
Premiums receivable and other reinsurance balances (5,100) (47,370)
Deferred policy acquisition costs 104,002 (63,690)
Reinsurance ceded receivable balances 64,814 (540)
Future policy benefits, other policy claims and benefits, and other reinsurance balances 806,172 755,790
Deferred income taxes 69,071 (5,469)
Other assets and other liabilities, net (165,129) 62,682
Amortization of net investment premiums, discounts and other (43,662) (69,347)
Investment related gains, net (142,614) (67,321)
Gain on repurchase of collateral finance facility securities (46,506) 0
Excess tax benefits from share-based payment arrangement (2,420) 24
Other, net 66,027 27,251
Net cash provided by operating activities 805,121 818,257
Cash Flows from Investing Activities:    
Sales of fixed maturity securities available-for-sale 1,898,833 1,759,932
Maturities of fixed maturity securities available-for-sale 62,734 104,008
Purchases of fixed maturity securities available-for-sale (2,487,016) (2,518,580)
Cash invested in mortgage loans (244,939) (225,005)
Cash invested in policy loans (17) (1,589)
Cash invested in funds withheld at interest (60,156) (60,145)
Principal payments on mortgage loans on real estate 150,098 46,313
Principal payments on policy loans 32,940 11,752
Change in short-term investments 241,136 35,989
Change in other invested assets (1,591) 62,541
Net cash used in investing activities (407,978) (784,784)
Cash Flows from Financing Activities:    
Dividends to stockholders (35,169) (26,524)
Repurchase of collateral finance facility securities (112,000) 0
Net change in short-term debt 120,000 0
Purchases of treasury stock (234,690) (6,924)
Excess tax benefits from share-based payment arrangement 2,420 (24)
Exercise of stock options, net 11,439 (651)
Change in cash collateral for derivatives and other arrangements (31,858) (15,096)
Deposits on universal life and other investment type policies and contracts 39,706 79,134
Withdrawals on universal life and other investment type policies and contracts (397,033) (70,753)
Net cash used in financing activities (637,185) (40,838)
Effect of exchange rate changes on cash (46,231) 1,836
Change in cash and cash equivalents (286,273) (5,529)
Cash and cash equivalents, beginning of period 1,259,892 962,870
Cash and cash equivalents, end of period 973,619 957,341
Supplementary information:    
Cash paid for interest 58,387 49,094
Cash paid for income taxes, net of refunds $ 105,401 $ 40,735