Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 1,171	$ 144,504	$ 139,074	$ 272,603
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Change in future policy benefits and other policy liabilities			27,932	18,433
Deferral of policy acquisition costs			(271,170)	(254,668)
Amortization of deferred policy acquisition costs	73,643	68,110	145,692	136,033
Change in income taxes			(59,157)	(33,790)
Investment (gains) losses	99	328	(1,206)	4,936
Accretion and amortization of investments			(1,863)	(638)
Depreciation and amortization			14,483	17,441
Change in reinsurance recoverables			110,508	130,233
Change in agent balances, due premiums and other receivables			(14,793)	(15,140)
Change in renewal commissions receivable			19,237	8,819
Trading securities sold, matured, or called (acquired), net			15,160	(14,722)
Share-based compensation			15,668	14,585
Impairment of goodwill and other long-lived assets	253,607		253,607
Gain on insurance proceeds received from acquisition representation and warranty policy	(50,000)		(50,000)
Change in other operating assets and liabilities, net			41,010	27,567
Net cash provided by (used in) operating activities			384,182	311,692
Available-for-sale investments sold, matured or called:
Fixed-maturity securities — sold			1,382	15,734
Fixed-maturity securities — matured or called			215,444	152,859
Short-term investments — sold				28,799
Short-term investments — matured or called			268	40,000
Equity securities — sold				15
Equity securities — matured or called			4,272
Available-for-sale investments acquired:
Fixed-maturity securities			(315,271)	(193,283)
Short-term investments				(19,767)
Equity securities — acquired				(330)
Purchases of property and equipment and other investing activities, net			(12,604)	(10,234)
Cash collateral received (returned) on loaned securities, net			(8,789)	(23,295)
Sales (purchases) of short-term investments using securities lending collateral, net			8,789	23,295
Insurance Proceeds Received from Acquisition Representation and Warranty Policy			50,000
Net cash provided by (used in) investing activities			(56,509)	13,793
Cash flows from financing activities:
Dividends paid			(52,091)	(47,509)
Common stock repurchased			(251,821)	(196,037)
Tax withholdings on share-based compensation			(7,491)	(10,239)
Finance leases			(130)	(133)
Net cash provided by (used in) financing activities			(311,533)	(253,918)
Effect of foreign exchange rate changes on cash			(1,996)	778
Change in cash and cash equivalents			14,144	72,345
Cash and cash equivalents, beginning of period			613,148	489,240	$ 489,240
Cash and cash equivalents, end of period	$ 627,292	$ 561,585	$ 627,292	$ 561,585	$ 613,148