Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Investments:
Securities held to maturity, at amortized cost (fair value: $7,470,133 and $7,175,443)	$ 7,042,233		$ 6,841,543
Securities available for sale, at fair value (cost: $2,687,568 and $2,590,074)	2,854,690		2,728,680
Mortgage loans, net of allowance for possible losses ($650 and $650)	143,918	[1]	149,503	[1]
Policy loans	63,877		63,645
Derivatives, index options	95,987		114,287
Other long-term investments	29,030		28,774
Short-term investments	14,989		0
Total investments	10,244,724		9,926,432
Cash and cash equivalents	71,104		277,078
Deferred policy acquisition costs	792,992		802,919
Deferred sales inducements	152,352		159,766
Accrued investment income	101,545		96,127
Federal income tax receivable	0		0
Other assets	99,286		89,570
Total assets	11,462,003		11,351,892
Future policy benefits:
Universal life and annuity contracts	9,404,339		9,384,297
Traditional life reserves	137,928		138,225
Other policyholder liabilities	153,389		139,222
Deferred Federal income tax liability	44,987		31,675
Federal income tax payable	42		3,336
Other liabilities	134,666		98,817
Total liabilities	9,875,351		9,795,572
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	38,116		38,116
Accumulated other comprehensive income	50,792		41,786
Retained earnings	1,494,108		1,472,782
Total stockholders’ equity	1,586,652		1,556,320
Total liabilities and stockholders' equity	11,462,003		11,351,892
Common Class A [Member]
Common stock:
Common stock, value outstanding	3,436		3,436
Common Class B [Member]
Common stock:
Common stock, value outstanding	$ 200		$ 200

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