Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Investments:
Securities held to maturity, at amortized cost (fair value: $6,853,264 and $6,656,144)	$ 6,605,854		$ 6,510,320
Securities available for sale, at fair value (cost: $2,534,116 and $2,535,264)	2,681,662		2,651,544
Mortgage loans, net of allowance for possible losses ($650 and $650)	128,506	[1]	132,765	[1]
Policy loans	65,144		65,969
Derivatives, index options	134,916		169,314
Other long-term investments	30,682		30,991
Total investments	9,646,764		9,560,903
Cash and short-term investments	132,839		120,859
Deferred policy acquisition costs	774,741		785,706
Deferred sales inducements	163,038		169,570
Accrued investment income	98,564		95,367
Federal income tax receivable	1,786		0
Other assets	94,885		98,011
Total assets	10,912,617		10,830,416
Future policy benefits:
Universal life and annuity contracts	9,019,804		8,987,062
Traditional life reserves	138,064		138,072
Other policyholder liabilities	143,738		142,587
Deferred Federal income tax liability	22,622		7,199
Federal income tax payable	0		10,067
Other liabilities	110,701		97,481
Total liabilities	9,434,929		9,382,468
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	37,767		37,767
Accumulated other comprehensive income	47,994		38,080
Retained earnings	1,388,292		1,368,466
Total stockholders’ equity	1,477,688		1,447,948
Total liabilities and stockholders' equity	10,912,617		10,830,416
Common Class A [Member]
Common stock:
Common stock, value outstanding	3,435		3,435
Common Class B [Member]
Common stock:
Common stock, value outstanding	$ 200		$ 200

[1] Loan-to-Value Ratio using the most recent appraised value.