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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flows from Operating Activities:    
Net income $ 185,535,000 $ 123,318,000
Change in operating assets and liabilities:    
Accrued investment income (30,083,000) (28,616,000)
Premiums receivable and other reinsurance balances 72,864,000 (61,722,000)
Deferred policy acquisition costs 42,741,000 (65,583,000)
Reinsurance ceded balances 28,131,000 28,686,000
Future policy benefits, other policy claims and benefits, and other reinsurance balances 275,091,000 554,354,000
Total deferred income taxes 16,343,000 38,107,000
Other assets and other liabilities, net (12,317,000) 5,944,000
Amortization of net investment premiums, discounts and other (22,497,000) (35,281,000)
Investment related gains, net (94,371,000) (43,520,000)
Gains Losses On Extinguishment Of Collateral Finance Securities (46,506,000) 0
Excess tax benefits from share-based payment arrangement (143,000) 30,000
Other, net 80,142,000 38,938,000
Net cash provided by operating activities 494,930,000 554,655,000
Cash Flows from Investing Activities:    
Sales of fixed maturity securities available-for-sale 795,575,000 47,096,000
Maturities of fixed maturity securities available-for-sale 36,028,000 36,437,000
Purchases of fixed maturity securities available-for-sale (1,277,240,000) (572,345,000)
Cash invested in mortgage loans (79,361,000) (75,081,000)
Cash invested in policy loans 0 0
Cash invested in funds withheld at interest (29,829,000) (33,083,000)
Principal payments on mortgage loans on real estate 52,157,000 22,081,000
Principal payments on policy loans 32,378,000 330,000
Change in short-term investments and other invested assets 84,917,000 65,256,000
Net cash used in investing activities (385,375,000) (509,309,000)
Cash Flows from Financing Activities:    
Dividends to stockholders (17,753,000) (13,255,000)
Repurchase of long-term debt (112,000,000) 0
Purchases of treasury stock (47,640,000) (4,118,000)
Excess tax benefits from share-based payment arrangement 143,000 (30,000)
Exercise of stock options, net 1,071,000 216,000
Change in cash collateral for derivative positions 11,532,000 (100,565,000)
Deposits on universal life and other investment type policies and contracts 17,241,000 37,303,000
Withdrawals on universal life and other investment type policies and contracts 204,196,000 59,922,000
Net cash used in financing activities (351,602,000) (140,371,000)
Effect of exchange rate changes on cash (16,004,000) 6,088,000
Change in cash and cash equivalents (258,051,000) (88,937,000)
Cash and cash equivalents, beginning of period 1,259,892,000 962,870,000
Cash and cash equivalents, end of period 1,001,841,000 873,933,000
Supplementary information:    
Cash paid for interest 16,552,000 24,592,000
Cash paid for income taxes, net of refunds $ 9,125,000 $ 15,112,000