Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Investments:
Securities held to maturity, at amortized cost (fair value: $6,574,186 and $6,503,627)	$ 6,345,116		$ 5,962,120
Securities available for sale, at fair value (cost: $2,618,250 and $2,568,512)	2,752,530		2,826,001
Mortgage loans, net of allowance for possible losses ($650 and $650)	117,091	[1]	142,170	[1]
Policy loans	68,307		71,549
Derivatives, index options	119,276		57,890
Other long-term investments	31,372		41,439
Total investments	9,433,692		9,101,169
Cash and short-term investments	94,458		124,561
Deferred policy acquisition costs	768,309		705,397
Deferred sales inducements	168,206		152,844
Accrued investment income	96,847		92,665
Federal income tax receivable	8,068		5,655
Other assets	98,888		81,567
Total assets	10,668,468		10,263,858
Future policy benefits:
Universal life and annuity contracts	8,797,076		8,430,545
Traditional life reserves	137,209		138,309
Other policyholder liabilities	159,822		148,561
Deferred Federal income tax liability	22,501		55,054
Federal income tax payable	0		0
Other liabilities	130,022		99,709
Total liabilities	9,246,630		8,872,178
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	37,767		37,767
Accumulated other comprehensive income	39,812		76,786
Retained earnings	1,340,624		1,273,492
Total stockholders’ equity	1,421,838		1,391,680
Total liabilities and stockholders' equity	10,668,468		10,263,858
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.