Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Investments:
Securities held to maturity, at amortized cost (fair value: $6,979,345 and $6,656,144)	$ 6,641,083		$ 6,510,320
Securities available for sale, at fair value (cost: $2,625,676 and $2,535,264)	2,799,450		2,651,544
Mortgage loans, net of allowance for possible losses ($650 and $650)	152,208	[1]	132,765	[1]
Policy loans	64,988		65,969
Derivatives, index options	146,514		169,314
Other long-term investments	30,421		30,991
Total investments	9,834,664		9,560,903
Cash and short-term investments	133,506		120,859
Deferred policy acquisition costs	774,530		785,706
Deferred sales inducements	159,143		169,570
Accrued investment income	95,816		95,367
Federal income tax receivable	3,434		0
Other assets	94,988		98,011
Total assets	11,096,081		10,830,416
Future policy benefits:
Universal life and annuity contracts	9,155,686		8,987,062
Traditional life reserves	137,099		138,072
Other policyholder liabilities	149,714		142,587
Deferred Federal income tax liability	30,256		7,199
Federal income tax payable	0		10,067
Other liabilities	107,429		97,481
Total liabilities	9,580,184		9,382,468
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	38,116		37,767
Accumulated other comprehensive income	56,670		38,080
Retained earnings	1,417,475		1,368,466
Total stockholders’ equity	1,515,897		1,447,948
Total liabilities and stockholders' equity	11,096,081		10,830,416
Common Class A [Member]
Common stock:
Common stock, value outstanding	3,436		3,435
Common Class B [Member]
Common stock:
Common stock, value outstanding	$ 200		$ 200

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