Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net of Income Tax [Member]
Balance, beginning of period at Dec. 31, 2022		$ 368		$ 2,153,617	$ (122,731)
Share-based compensation			$ 22,124
Net issuance of common stock		2	(2)
Repurchases of common stock		(12)	(22,122)	(188,488)
Net income	$ 272,603			272,603
Dividends				(47,509)
Effect of change in discount rate assumptions on the liability for future policy benefits					(75,030)
Change in foreign currency translation adjustment					8,026
Change in net unrealized investment gains (losses) during the period					14,618
Balance, end of period at Jun. 30, 2023	$ 2,015,464	358		2,190,223	(175,117)
Dividends declared per share	$ 1.3
Balance, beginning of period at Mar. 31, 2023		364		2,177,428	(231,382)
Share-based compensation			5,503
Net issuance of common stock		1	(1)
Repurchases of common stock		(7)	(5,502)	(108,111)
Net income	$ 144,504			144,504
Dividends				(23,598)
Effect of change in discount rate assumptions on the liability for future policy benefits					67,352
Change in foreign currency translation adjustment					7,005
Change in net unrealized investment gains (losses) during the period					(18,092)
Balance, end of period at Jun. 30, 2023	$ 2,015,464	358		2,190,223	(175,117)
Dividends declared per share	$ 0.65
Balance, beginning of period at Dec. 31, 2023	$ 2,065,967	350		2,276,946	(211,329)
Share-based compensation			20,502
Net issuance of common stock		1	(1)
Repurchases of common stock	(251,800)	(11)	(20,501)	(241,097)
Net income	139,074			139,074
Dividends				(52,091)
Effect of change in discount rate assumptions on the liability for future policy benefits					240,527
Change in foreign currency translation adjustment					(13,272)
Change in net unrealized investment gains (losses) during the period					(17,338)
Balance, end of period at Jun. 30, 2024	$ 2,121,760	340		2,122,832	(1,412)
Dividends declared per share	$ 1.5
Balance, beginning of period at Mar. 31, 2024		346		2,285,937	(100,375)
Share-based compensation			5,690
Repurchases of common stock		(6)	$ (5,690)	(138,440)
Net income	$ 1,171			1,171
Dividends				(25,836)
Effect of change in discount rate assumptions on the liability for future policy benefits					108,587
Change in foreign currency translation adjustment					(3,817)
Change in net unrealized investment gains (losses) during the period					(5,807)
Balance, end of period at Jun. 30, 2024	$ 2,121,760	$ 340		$ 2,122,832	$ (1,412)
Dividends declared per share	$ 0.75