Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net earnings	$ 43,623	$ 42,987
Adjustments to reconcile net earnings to net cash from operating activities:
Universal life and annuity contract interest	211,738	127,547
Surrender charges and other policy revenues	(7,105)	(7,009)
Realized (gains) losses on investments	(3,914)	(7,743)
Accrual and amortization of investment income	(1,487)	(1,400)
Depreciation and amortization	2,813	2,841
(Increase) decrease in value of index options	(91,124)	(9,959)
(Increase) decrease in deferred policy acquisition and sales inducement costs	(4,984)	3,664
(Increase) decrease in accrued investment income	(2,224)	(2,301)
(Increase) decrease in other assets	(2,594)	(3,960)
Increase (decrease) in liabilities for future policy benefits	5,349	3,602
Increase (decrease) in other policyholder liabilities	16,669	2,797
Increase (decrease) in Federal income taxes	(563)	(12,757)
Increase (decrease) in other liabilities	87	3,385
Other, net	0	128
Net cash provided by operating activities	166,284	141,822
Proceeds from sales of:
Securities available for sale	9,670	(367)
Other investments	11,925	3,492
Proceeds from maturities and redemptions of:
Securities held to maturity	710,366	696,502
Securities available for sale	128,127	177,601
Index options	54,640	941
Purchases of:
Securities held to maturity	(970,658)	(785,820)
Securities available for sale	(191,387)	(271,552)
Index options	(28,498)	(26,153)
Other investments	(15)	(4,263)
Principal payments on mortgage loans	25,490	38,154
Cost of mortgage loans acquired	(2,419)	(8,403)
Decrease (increase) in policy loans	754	598
Other, net	(3)	0
Net cash used in investing activities	(252,008)	(179,270)
Cash flows from financing activities:
Deposits to account balances for universal life and annuity contracts	477,776	454,963
Return of account balances on universal life and annuity contracts	(448,973)	(425,827)
Issuance of common stock under stock option plan	0	0
Net cash provided by financing activities	28,803	29,136
Effect of foreign exchange	592	286
Net increase (decrease) in cash and short-term investments	(56,329)	(8,026)
Cash and short-term investments at beginning of period	124,561	119,290
Cash and short-term investments at end of period	68,232	111,264
Cash paid during the period for:
Interest	30	20
Income taxes	22,695	33,495
Noncash operating activities:
Deferral of sales inducements	$ 1,429	$ 158