Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Investments:
Securities held to maturity, at amortized cost (fair value: $6,491,176 and $6,503,627)	$ 6,232,872		$ 5,962,120
Securities available for sale, at fair value (cost: $2,626,174 and $2,658,512)	2,769,878		2,826,001
Mortgage loans, net of allowance for possible losses ($650 and $650)	119,372	[1]	142,170	[1]
Policy loans	70,795		71,549
Derivatives, index options	121,890		57,890
Other long-term investments	31,977		41,439
Total investments	9,346,784		9,101,169
Cash and short-term investments	68,232		124,561
Deferred policy acquisition costs	753,105		705,397
Deferred sales inducements	166,984		152,844
Accrued investment income	95,279		92,665
Federal income tax receivable	0		5,655
Other assets	82,393		81,567
Total assets	10,512,777		10,263,858
Future policy benefits:
Universal life and annuity contracts	8,670,321		8,430,545
Traditional life reserves	137,318		138,309
Other policyholder liabilities	165,230		148,561
Deferred Federal income tax liability	22,491		55,054
Federal income tax payable	6,708		0
Other liabilities	110,529		99,709
Total liabilities	9,112,597		8,872,178
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	37,767		37,767
Accumulated other comprehensive income	41,663		76,786
Retained earnings	1,317,115		1,273,492
Total stockholders’ equity	1,400,180		1,391,680
Total liabilities and stockholders' equity	10,512,777		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.