Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements of Cash Flows
Net cash provided by operating activities	$ 544,306	$ 231,364
Proceeds from sales, maturities and redemptions of investments:
Fixed maturities, available-for-sale	6,078,196	2,979,149
Mortgage loans on real estate	86,171	42,733
Limited partnership interests, other corporation interests and other investments	18,374	23,585
Purchases of investments:
Fixed maturities, available-for-sale	(4,823,436)	(2,412,666)
Mortgage loans on real estate	(258,206)	(71,091)
Limited partnership interests, other corporation interests and other investments	(1,360)	(3,744)
Net change in short-term investments	(1,731,348)	(1,023,780)
Policy loans, net	37	1,339
Purchases of furniture, equipment and software	(10,127)	(9,005)
Net cash used in investing activities	(641,699)	(473,480)
Cash flows from financing activities:
Contract deposits	1,062,743	1,265,415
Contract withdrawals	(919,009)	(906,445)
Change in due to parent and affiliates	(19,013)	(8,973)
Dividends paid	(46,435)	(103,200)
Net commercial paper borrowings	(4,199)	(2,551)
Change in bank overdrafts	17,424	(609)
Income tax benefit of stock option exercises	53	46
Net cash provided by financing activities	91,564	243,683
Net decrease in cash	(5,829)	1,567
Cash, beginning of year	11,387	7,593
Cash, end of period	5,558	9,160
Net cash (paid) received during the year for:
Income taxes	8,265	28,734
Interest	(18,673)	(18,690)
Non-cash investing and financing transactions during the years:
Share-based compensation expense	1,266	1,121
Assets acquired in settlement of fixed maturity investment		1,125
Assets received from limited partnership investment distributions	(4,571)
Fixed maturity investments, available-for-sale acquired in reinsurance termination (See Note 4)	(44,104)
Policy loans acquired in reinsurance termination (See Note 4)	$ (6,468)