Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments:
Fixed maturities, available-for-sale, at fair value (amortized cost $15,397,429 and $16,756,216)	$ 16,760,840	$ 18,188,344
Fixed maturities, held for trading, at fair value (amortized cost $163,569 and $356,012)	174,763	367,600
Mortgage loans on real estate (net of allowances of $2,890 and $2,890)	2,897,724	2,881,758
Policy loans	4,182,726	4,260,200
Short-term investments, available-for-sale (amortized cost $1,925,769 and $266,332)	1,925,769	266,332
Limited partnership and other corporation interests	113,610	124,814
Other investments	22,368	21,328
Total investments	26,077,800	26,110,376
Other assets:
Cash	6,558	11,387
Reinsurance receivable	602,675	638,797
Deferred acquisition costs and value of business acquired	255,956	204,461
Investment income due and accrued	291,408	257,028
Collateral under securities lending agreements	45,813	142,022
Due from parent and affiliates	94,386	82,828
Goodwill	105,255	105,255
Other intangible assets	17,707	18,249
Other assets	663,148	609,623
Assets of discontinued operations	31,783	33,053
Separate account assets	25,421,394	24,605,526
Total assets	53,613,883	52,818,605
Policy benefit liabilities:
Future policy benefits	23,585,776	23,480,618
Policy and contract claims	319,883	321,375
Policyholders' funds	345,189	374,821
Provision for policyholders' dividends	64,230	63,102
Undistributed earnings on participating business	15,041	10,393
Total policy benefit liabilities	24,330,119	24,250,309
General liabilities:
Due to parent and affiliates	549,550	544,447
Commercial paper	96,786	97,987
Payable under securities lending agreements	45,813	142,022
Deferred income tax liabilities, net	290,663	288,995
Other liabilities	705,634	719,969
Liabilities of discontinued operations	31,782	33,053
Separate account liabilities	25,421,394	24,605,526
Total liabilities	51,471,741	50,682,308
Commitments and contingencies
Stockholder's equity:
Preferred stock, $1 par value, 50,000,000 shares authorized; none issued and outstanding
Common stock, $1 par value, 50,000,000 shares authorized; 7,032,000 shares issued and outstanding	7,032	7,032
Additional paid-in capital	771,681	771,041
Accumulated other comprehensive income (loss)	618,504	635,699
Retained earnings	744,925	722,525
Total stockholder's equity	2,142,142	2,136,297
Total liabilities and stockholder's equity	$ 53,613,883	$ 52,818,605