Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Investments:
Securities held to maturity, at amortized cost (fair value: $6,254,687 and $6,082,330)	$ 5,738,777		$ 5,641,909
Securities available for sale, at fair value (cost: $2,530,815 and $2,422,650)	2,754,759		2,624,953
Mortgage loans, net of allowance for possible losses ($0 and $4,571)	132,614	[1]	157,460	[1]
Policy loans	74,369		74,967
Derivatives, index options	65,555		30,844
Other long-term investments	43,467		34,472
Total investments	8,809,541		8,564,605
Cash and short-term investments	111,264		119,290
Deferred policy acquisition costs	708,220		722,542
Deferred sales inducements	152,360		155,753
Accrued investment income	90,176		87,875
Federal income tax receivable	0		0
Other assets	83,900		77,934
Total assets	9,955,461		9,727,999
Future policy benefits:
Universal life and annuity contracts	8,178,279		8,023,798
Traditional life and annuity contracts	138,452		139,657
Other policyholder liabilities	154,105		151,308
Deferred Federal income tax liability	44,023		46,481
Federal income tax payable	1,462		5,962
Other liabilities	107,819		84,008
Total liabilities	8,624,140		8,451,214
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	37,767		37,767
Accumulated other comprehensive income	64,725		53,176
Retained earnings	1,225,194		1,182,207
Total stockholders’ equity	1,331,321		1,276,785
Total liabilities and stockholders' equity	9,955,461		9,727,999
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.