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]	Redeemable Noncontrolling Interests in Consolidated Entities/Temporary Stockholders' Equity [Member]
Balance, beginning of period at Dec. 31, 2020		$ 393		$ 1,682,939	$ (1,380,912)
Share-based compensation			31,043
Net issuance of common stock		2	(2)
Repurchases of common stock		(1)	(25,817)
Net income (loss)				465,808
Dividends				(74,636)
Effect of change in discount rate assumptions on the liability for future policy benefits					269,895
Change in foreign currency translation adjustment					6,973
Change in net unrealized investment gains (losses) during the period					(64,355)
Acquisition of noncontrolling interest						8,438
Net income (loss) attributable to noncontrolling interests						(1,377)
Change in noncontrolling interests in consolidated entities, net						210
Redemption of noncontrolling interest in consolidated entities
Balance, end of period at Dec. 31, 2021	$ 911,330	394	5,224	2,074,111	(1,168,399)	7,271
Share-based compensation			14,820
Net issuance of common stock		1	(1)
Repurchases of common stock		(7)	(20,043)	(83,813)
Net income (loss)	115,039			115,039
Dividends				(21,645)
Effect of change in discount rate assumptions on the liability for future policy benefits					646,141
Change in foreign currency translation adjustment					3,289
Change in net unrealized investment gains (losses) during the period					(130,216)
Net income (loss) attributable to noncontrolling interests	(2,655)					(2,655)
Balance, end of period at Mar. 31, 2022	$ 1,434,895	388		2,083,692	(649,185)	4,616
Dividends declared per share	$ 0.55
Balance, beginning of period at Dec. 31, 2021	$ 911,330	394	5,224	2,074,111	(1,168,399)	7,271
Share-based compensation			33,624
Net issuance of common stock		2	(2)
Repurchases of common stock		(28)	(41,079)	(320,332)
Net income (loss)				460,939
Dividends				(83,783)
Effect of change in discount rate assumptions on the liability for future policy benefits					1,372,022
Change in foreign currency translation adjustment					(20,747)
Change in net unrealized investment gains (losses) during the period					(304,645)
Acquisition of noncontrolling interest
Net income (loss) attributable to noncontrolling interests						(5,038)
Change in noncontrolling interests in consolidated entities, net
Redemption of noncontrolling interest in consolidated entities			2,233			(2,233)
Balance, end of period at Dec. 31, 2022	2,009,534	368		2,130,935	(121,769)
Share-based compensation			16,622
Net issuance of common stock		2	(2)
Repurchases of common stock		(6)	$ (16,620)	(80,360)
Net income (loss)	125,106			125,106
Dividends				(23,910)
Effect of change in discount rate assumptions on the liability for future policy benefits					(142,974)
Change in foreign currency translation adjustment					998
Change in net unrealized investment gains (losses) during the period					32,711
Balance, end of period at Mar. 31, 2023	$ 1,921,101	$ 364		$ 2,151,771	$ (231,034)
Dividends declared per share	$ 0.65