Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Statement of Cash Flows [Abstract]
Cash provided from (used for) operating activities	$ 1,050,387	$ 1,060,022
Investments sold or matured:
Fixed maturities available for sale—sold	346,722	91,795
Fixed maturities available for sale—matured or other redemptions	387,787	249,653
Other long-term investments	55,877	36,060
Total investments sold or matured	790,386	377,508
Acquisition of investments:
Fixed maturities—available for sale	(1,178,751)	(687,993)
Other long-term investments	(186,275)	(206,609)
Total investments acquired	(1,365,026)	(894,602)
Net (increase) decrease in policy loans	(15,792)	(1,412)
Net (increase) decrease in short-term investments	(16,628)	14,418
Additions to properties	(19,766)	(30,730)
Other investing activities	0	(59,200)
Investments in low-income housing interests	(64,023)	(35,236)
Cash provided from (used for) investing activities	(690,849)	(629,254)
Cash provided from (used for) financing activities:
Issuance of common stock	49,536	67,347
Cash dividends paid to shareholders	(60,441)	(60,068)
Repayment of debt	(150,000)	(300,000)
Proceeds from issuance of debt	250,492	325,000
Payment for debt issuance costs	(5,272)	(7,639)
Net borrowing (repayment) of commercial paper	(60,582)	(10,991)
Acquisition of treasury stock	(335,452)	(393,380)
Net receipts (payments) from deposit-type products	(66,078)	(48,276)
Cash provided from (used for) financing activities	(377,797)	(428,007)
Effect of foreign exchange rate changes on cash	11,682	(1,283)
Net increase (decrease) in cash	(6,577)	1,478
Cash at beginning of year	92,163	94,847
Cash at end of period	$ 85,586	$ 96,325