Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 186,212	$ 150,032
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Earnings allocated to participating policyholders	1,503	1,608
Amortization of premiums (accretion) of discounts on investments, net	(30,946)	(30,517)
Net realized (gains) losses on investments	(45,828)	34,156
Net proceeds (purchases) of trading securities	(33,115)	17,552
Interest credited to contractholders	392,714	380,516
Depreciation and amortization	29,929	38,673
Deferral of acquisition costs	(65,327)	(64,818)
Deferred income taxes	29,583	66,959
Other, net	(9,808)	(23,301)
Changes in assets and liabilities:
Policy benefit liabilities	(96,126)	126,390
Reinsurance receivable	2,964	(7,623)
Accrued interest and other receivables	(19,421)	(35,133)
Other assets	(6,894)	(20,898)
Other liabilities	13,585	(109,237)
Net cash provided by operating activities	349,025	524,359
Proceeds from sales, maturities and redemptions of investments:
Fixed maturities, available-for-sale	4,581,017	3,238,262
Mortgage loans on real estate	63,755	114,729
Equity investments and other limited partnership interests	45,255	52,607
Purchases of investments:
Fixed maturities, available-for-sale	(4,526,471)	(3,637,171)
Mortgage loans on real estate	(551,951)	(295,207)
Equity investments and other limited partnership interests	(6,332)	(17,491)
Net change in short-term investments	(483,015)	(865,902)
Net change in repurchase agreements	117,700	410,318
Policy loans, net	(14,807)	23,976
Other, net	921	1,334
Net cash used in investing activities	(773,928)	(974,545)
Cash flows from financing activities:
Contract deposits	1,872,213	1,556,709
Contract withdrawals	(1,348,054)	(1,096,704)
Change in due to parent and affiliates	79,607	(25,781)
Dividends paid	(153,350)	(147,917)
Net commercial paper borrowings (repayments)	4,264	(1,062)
Change in bank overdrafts	(31,704)	(4)
Income tax benefit of stock option exercises	1,646	1,181
Net cash provided by financing activities	424,622	286,422
Net decrease in cash	(281)	(163,764)
Cash, beginning of period	4,476	170,978
Cash, end of period	4,195	7,214
Net cash paid (received) during the periods for:
Income taxes	(121,162)	(1,056)
Net income tax payments withheld and remitted to taxing authorities	41,105	41,617
Interest	18,873	18,805
Non-cash investing and financing transactions during the periods:
Share-based compensation expense	1,289	1,386
Fair value of assets acquired in settlement of fixed maturity investments	12,865
Real estate acquired in satisfaction of debt	$ 2,140