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 income	$ 367,974	$ 371,980	$ 386,164
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Change in future policy benefits and other policy liabilities	225,896	462,733	574,060
Deferral of policy acquisition costs	(503,336)	(552,192)	(512,634)
Amortization of deferred policy acquisition costs	356,143	251,179	224,321
Deferred tax provision	(79,980)	(25,593)	266
Change in income taxes	26,414	1,426	(5,008)
Investment (gains) losses	995	(5,872)	4,996
Accretion and amortization of investments	3,329	5,118	751
Depreciation and amortization	34,174	29,836	17,697
Change in reinsurance recoverables	231,902	8,312	(100,185)
Change in agent balances, due premiums and other receivables	(475)	6,046	(32,348)
Change in renewal commissions receivable	19,845	(23,459)	(3,144)
Trading securities sold, matured, or called (acquired), net	19,962	(8,817)	26,694
Share-based compensation	22,361	16,842	19,027
Goodwill impairment loss	60,000	76,000
Loss on extinguishment of debt		8,927
Change in other operating assets and liabilities, net	(27,539)	34,490	42,760
Net cash provided by (used in) operating activities	757,665	656,956	643,417
Available-for-sale investments sold, matured or called:
Fixed-maturity securities — sold	23,628	131,953	67,760
Fixed-maturity securities — matured or called	359,717	454,135	429,147
Short-term investments — sold	28,251	50,065
Short-term investments — matured or called	85,302	40,000
Equity securities - sold	16	718	2,581
Equity securities - matured or called	3,063
Available-for-sale investments acquired:
Fixed-maturity securities	(580,485)	(901,591)	(522,123)
Short-term investments	(97,415)	(176,125)
Equity securities — acquired	(187)	(3,391)	(3,272)
Purchases of property and equipment and other investing activities, net	(25,805)	(24,688)	(27,622)
Cash collateral received (returned) on loaned securities, net	6,409	22,375	43,431
Sales (purchases) of short-term investments using securities lending collateral, net	(6,409)	(22,375)	(43,431)
Purchase of business, net of cash acquired	3,867	(494,459)
Net cash provided by (used in) investing activities	(200,048)	(923,383)	(53,529)
Cash flows from financing activities:
Dividends paid	(83,783)	(74,636)	(64,346)
Common stock repurchased	(356,306)	(18,751)	(231,431)
Proceeds from revolving credit facility		125,000
Repayment of revolving credit facility		(125,000)
Proceeds from issuance of debt		597,300
Debt issuance costs		(5,332)
Repayment of debt		(383,691)
Payment on note issued to seller of business	(12,364)
Tax withholdings on share-based compensation	(5,135)	(6,652)	(5,739)
Finance leases	(262)	(264)	(274)
Net cash provided by (used in) financing activities	(457,850)	107,974	(301,790)
Effect of foreign exchange rate changes on cash	(3,028)	3,385	2,595
Change in cash and cash equivalents	96,739	(155,068)	290,693
Cash and cash equivalents, beginning of period	392,501	547,569	256,876
Cash and cash equivalents, end of period	489,240	392,501	547,569
Supplemental disclosures of cash flow information:
Income taxes paid	178,218	154,812	123,305
Interest paid	$ 27,060	33,905	$ 27,853
Non-cash activities:
Increases in note issued to seller of business		$ 15,000