Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net earnings	$ 101,144	$ 180,681	$ 92,312
Adjustments to reconcile net earnings to cash provided by operating activities:
Universal life and annuity contract interest	15,678	213,184	206,250
Surrender charges and other policy revenues	(19,166)	(26,315)	(26,623)
Realized (gains) losses on investments	(6,355)	(14,950)	(21,071)
Accretion/amortization of discounts and premiums, investments	(4,547)	1,846	3,371
Depreciation and amortization	14,330	13,001	11,903
Increase (decrease) in estimated credit losses on investments	588	501	(2,027)
(Increase) decrease in value of debt securities trading	214,935	(11,331)	0
(Increase) decrease in value of equity securities	2,731	(6,369)	937
(Increase) decrease in value of derivative options	86,866	(120,717)	(14,754)
(Increase) decrease in deferred policy acquisition and sales inducement costs, and value of business acquired	74,561	(25,594)	82,897
(Increase) decrease in accrued investment income	(7,856)	3,929	4,975
(Increase) decrease in reinsurance recoverable	121,607	169,313	728
(Increase) decrease in cost of reinsurance	11,358	13,154	0
(Increase) decrease in other assets	(2,097)	(6,017)	(620)
Increase (decrease) in liabilities for future policy benefits	112,712	114,873	14,138
(Decrease) increase in other policyholder liabilities	40,741	(4,142)	10,873
(Decrease) increase in Federal income tax liability	(8,839)	12,739	(14,156)
Increase (decrease) in deferred Federal income tax	9,061	3,746	20,031
Increase (decrease) in funds withheld liability	(395,354)	(212,324)	0
(Decrease) increase in other liabilities	(3,558)	(22,383)	3,907
Net cash provided by operating activities	358,540	276,825	373,071
Proceeds from sales of:
Debt securities available-for-sale	39,254	1,221,308	0
Debt securities trading	21,253	15,734	0
Other investments	5,999	23,241	9,198
Proceeds from maturities, redemptions, and prepayments of:
Debt securities held-to-maturity	0	0	960,360
Debt securities available-for-sale	1,073,194	1,520,734	334,397
Debt securities trading	89,848	61,313	0
Other investments	27,373	22,597	13,715
Derivatives, index options	46,563	197,877	106,451
Purchases of:
Debt securities held-to-maturity	0	0	(544,092)
Debt securities available-for-sale	(939,820)	(1,382,318)	(297,998)
Debt securities trading	(310,144)	(1,140,965)	0
Equity securities	(1,013)	(15,265)	(1,395)
Derivatives, index options	(53,996)	(47,383)	(62,568)
Other investments	(145,391)	(57,153)	(52,944)
Property, equipment, and other productive assets	(1,594)	(9,977)	(12,106)
Net change in short-term investments	(3,937)	0	0
Principal payments on mortgage loans	26,804	28,847	14,814
Cost of mortgage loans acquired	(47,402)	(183,601)	(80,220)
(Increase) decrease in policy loans	(18)	2,797	5,925
Other (increases) decreases to funds withheld	97	(77,191)	0
Net cash provided by (used in) investing activities	(172,930)	180,595	393,537
Cash flows from financing activities:
Dividends on common stock	(1,274)	(1,272)	(1,273)
Deposits to account balances for universal life and annuity contracts	287,799	610,357	501,867
Return of account balances on universal life and annuity contracts	(891,666)	(932,531)	(939,309)
Principal payments under finance lease obligation	(338)	(389)	(378)
Net cash provided by (used in) financing activities	(605,479)	(323,835)	(439,093)
Effect of foreign exchange	515	(20)	19
Net increase (decrease) in cash, cash equivalents, and restricted cash	(419,354)	133,565	327,534
Cash, cash equivalents, and restricted cash at beginning of year	714,624	581,059	253,525
Cash, cash equivalents, and restricted cash at end of year	295,270	714,624	581,059
Cash paid during the year for:
Interest	75	75	75
Income taxes	24,712	30,043	13,980
Noncash operating activities:
Net deferral and amortization of sales inducements	(9,992)	4,355	(12,464)
Establishment of funds withheld liability (see Note 5)	243,123	0	1,697,591
Deferred cost of reinsurance (see Note 5)	0	0	102,840
Deferred gain on reinsurance (see Note 5)	30,811	0	0
Noncash investing activities:
Exchange of debt securities trading	0	4,800	0
Right of use asset obtained in exchange for finance lease liability	$ 0	$ 1,422	$ 0