Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Statement of Cash Flows [Abstract]
Cash provided from (used for) operating activities	$ 804,141	$ 693,390
Investments sold or matured:
Fixed maturities available for sale—sold	145,824	219,027
Fixed maturities available for sale—matured or other redemptions	138,259	305,656
Other long-term investments	59,593	48,334
Total investments sold or matured	343,676	573,017
Acquisition of investments:
Fixed maturities—available for sale	(623,023)	(717,994)
Other long-term investments	(91,186)	(157,913)
Total investments acquired	(714,209)	(875,907)
Net (increase) decrease in policy loans	(18,692)	(7,553)
Net (increase) decrease in short-term investments	42,993	(46,679)
Additions to property and equipment	(25,629)	(13,627)
Investments in low-income housing interests	(38,276)	(37,181)
Cash provided from (used for) investing activities	(410,137)	(407,930)
Cash provided from (used for) financing activities:
Issuance of common stock	42,181	34,734
Cash dividends paid to shareholders	(41,569)	(40,208)
Repayment of debt	(165,612)	0
Proceeds from issuance of debt	170,000	250,492
Payment for debt issuance costs	(693)	(5,272)
Net borrowing (repayment) of commercial paper	(25,371)	(150,047)
Acquisition of treasury stock	(269,031)	(263,421)
Net receipts (payments) from deposit-type products	(116,437)	(33,782)
Cash provided from (used for) financing activities	(406,532)	(207,504)
Effect of foreign exchange rate changes on cash	(5,020)	2,138
Net increase (decrease) in cash	(17,548)	80,094
Cash at beginning of year	92,559	92,163
Cash at end of period	$ 75,011	$ 172,257