Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 125,106	$ 112,384
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Change in future policy benefits and other policy liabilities	(9,799)	(161,385)
Deferral of policy acquisition costs	(126,640)	(130,881)
Amortization of deferred policy acquisition costs	67,358	63,223
Change in income taxes	18,713	14,171
Investment (gains) losses	4,608	(751)
Accretion and amortization of investments	(309)	1,356
Depreciation and amortization	8,547	8,688
Change in reinsurance recoverables	47,766	248,511
Change in agent balances, due premiums and other receivables	(5,486)	2,245
Change in renewal commissions receivable	5,634	18,576
Trading securities sold, matured, or called (acquired), net	(14,808)	11,273
Share-based compensation	12,129	12,437
Change in other operating assets and liabilities, net	43,127	14,452
Net cash provided by (used in) operating activities	175,946	214,299
Available-for-sale investments sold, matured or called:
Fixed-maturity securities — sold	5,179	1,227
Fixed-maturity securities — matured or called	80,251	96,336
Short-term investments — matured or called		41,550
Equity securities — sold	5
Equity securities — matured or called		3,000
Available-for-sale investments acquired:
Fixed-maturity securities	(108,713)	(250,932)
Equity securities — acquired	(47)	(44)
Purchases of property and equipment and other investing activities, net	(7,861)	(7,676)
Cash collateral received (returned) on loaned securities, net	(26,486)	(1,358)
Sales (purchases) of short-term investments using securities lending collateral, net	26,486	1,358
Purchase of business, net of cash acquired		3,867
Net cash provided by (used in) investing activities	(31,186)	(112,672)
Cash flows from financing activities:
Dividends paid	(23,910)	(21,645)
Common stock repurchased	(85,275)	(99,010)
Payment on note issued to seller of business		(9,000)
Tax withholdings on share-based compensation	(9,739)	(4,852)
Finance leases	(68)	(64)
Net cash provided by (used in) financing activities	(118,992)	(134,571)
Effect of foreign exchange rate changes on cash	82	222
Change in cash and cash equivalents	25,850	(32,722)
Cash and cash equivalents, beginning of period	489,240	392,501	$ 392,501
Cash and cash equivalents, end of period	$ 515,090	$ 359,779	$ 489,240