Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investments:
Securities held to maturity, at amortized cost (fair value: $5,943,190 and $5,259,332)	$ 5,484,905	$ 4,977,516
Securities available for sale, at fair value (cost: $2,386,834 and $2,221,579)	2,589,228	2,390,107
Mortgage loans, net of allowance for possible losses ($4,001 and $3,962)	161,842	141,247
Policy loans	74,223	78,448
Derivatives, index options	17,769	80,284
Other long-term investments	34,331	29,569
Total investments	8,362,298	7,697,171
Cash and short-term investments	91,902	80,332
Deferred policy acquisition costs	715,134	691,939
Deferred sales inducements	151,414	143,844
Accrued investment income	89,772	79,720
Federal income tax receivable	8,447	427
Other assets	83,175	80,515
Total assets	9,502,142	8,773,948
Future policy benefits:
Universal life and annuity contracts	7,772,708	7,108,599
Traditional life and annuity contracts	139,203	139,182
Other policyholder liabilities	148,384	151,526
Deferred Federal income tax liability	64,851	57,857
Federal income tax payable	0	0
Other liabilities	99,600	97,993
Total liabilities	8,224,746	7,555,157
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	38,041	37,140
Accumulated other comprehensive income	58,112	50,408
Retained earnings	1,177,608	1,127,614
Total stockholders’ equity	1,277,396	1,218,791
Total liabilities and stockholders' equity	9,502,142	8,773,948
Common Class A [Member]
Common stock:
Common stock, value outstanding	3,435	3,429
Common Class B [Member]
Common stock:
Common stock, value outstanding	$ 200	$ 200