Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net earnings	$ 19,741	$ 18,211
Adjustments to reconcile net earnings to net cash from operating activities:
Universal life and annuity contract interest	101,543	92,149
Surrender charges and other policy revenues	(3,500)	(6,770)
Realized (gains) losses on investments	(1,167)	(3,092)
Accrual and amortization of investment income	(708)	(509)
Depreciation and amortization	10,823	195
(Increase) decrease in value of index options	(42,437)	(31,849)
Decrease (increase) in deferred policy acquisition and sales inducement costs	2,427	(19,730)
Increase in accrued investment income	(4,200)	(8,035)
Increase in other assets	(14,058)	(7,329)
Increase in liabilities for future policy benefits	1,923	6,905
(Decrease) increase in other policyholder liabilities	(740)	3,541
Decrease in Federal income taxes	3,298	9,847
(Decrease) increase in other liabilities	2,932	(3,532)
Other, net	127	0
Net cash provided by operating activities	76,004	50,002
Proceeds from sales of:
Securities available for sale	418	10,010
Other investments	477	1,940
Proceeds from maturities and redemptions of:
Securities held to maturity	384,604	150,205
Securities available for sale	79,767	29,127
Index options	260	10,180
Purchases of:
Securities held to maturity	(406,536)	(321,632)
Securities available for sale	(173,237)	(71,388)
Index options	(10,672)	(12,039)
Other investments	(1,503)	(779)
Principal payments on mortgage loans	4,536	7,904
Cost of mortgage loans acquired	(390)	(9,432)
Decrease (increase) in policy loans	318	909
Other, net	3	(1)
Net cash used in investing activities	(121,955)	(204,996)
Cash flows from financing activities:
Deposits to account balances for universal life and annuity contracts	212,423	346,146
Return of account balances on universal life and annuity contracts	(210,657)	(209,714)
Issuance of common stock under stock option plan	0	626
Net cash provided by financing activities	1,766	137,058
Effect of foreign exchange	386	(75)
Net increase (decrease) in cash and short-term investments	(43,799)	(18,011)
Cash and short-term investments at beginning of period	119,290	80,332
Cash and short-term investments at end of period	75,491	62,321
Cash paid during the period for:
Interest	10	10
Income taxes	6,539	0
Noncash operating activities:
Deferral of sales inducements	$ 1,314	$ 5,117