Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stocks	Additional Paid In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income	Unrealized investment gains (losses	Unrealized investment gains (losses Cumulative Effect, Period Of Adoption, Adjustment	Currency Translation Adjustments	Treasury Stock	Noncontrolling Interests
Beginning of period at Dec. 31, 2019		$ 105,803	$ 1,020,774	$ 7,932,372	$ (30,514)		$ 124,514	$ 24,952	$ (381,813)	$ (2,726,711)	$ 43,403
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(38,491)
Restricted stock units expensed			48,567
Change in controlling financial interest of a subsidiary			(53,635)
Change in unrealized (losses) gains on securities without an allowance for expected credit losses	$ 140,250						108,244
Change in unrealized (losses) gains on securities with an allowance for expected credit losses							32,004
Net change in period	29,927								29,927
Stock exercised/vested										13,917
Stock issued										726
Stock repurchased										(346,357)
Contributions (distributions)											(30,721)
Net income	532,985			530,670							2,315
Dividends ($0.89, $1.34, and $0.31 per share, respectively)				(84,147)
Other comprehensive loss, net of tax	170,177										(2)
End of period at Dec. 31, 2020		105,803	977,215	8,348,381	0	$ (62,172)	289,714	0	(351,886)	(3,058,425)	14,995
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(44,041)
Restricted stock units expensed			47,930
Change in controlling financial interest of a subsidiary			0
Change in unrealized (losses) gains on securities without an allowance for expected credit losses	(198,812)						(208,938)
Change in unrealized (losses) gains on securities with an allowance for expected credit losses							10,124
Net change in period	(20,969)								(20,969)
Stock exercised/vested										13,264
Stock issued										511
Stock repurchased										(122,426)
Contributions (distributions)											(8,799)
Net income	1,031,015			1,022,490							8,525
Dividends ($0.89, $1.34, and $0.31 per share, respectively)				(355,736)
Other comprehensive loss, net of tax	(219,781)					(219,781)			(20,969)		(2)
End of period at Dec. 31, 2021	6,667,730	$ 105,803	981,104	9,015,135	$ 0	(281,955)	90,900	$ 0	(372,855)	(3,167,076)	14,719
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(32,622)
Restricted stock units expensed			49,052
Change in controlling financial interest of a subsidiary			0
Change in unrealized (losses) gains on securities without an allowance for expected credit losses	(983,803)						(955,435)
Change in unrealized (losses) gains on securities with an allowance for expected credit losses							(28,370)
Net change in period	1,179								1,179
Stock exercised/vested										9,428
Stock issued										359
Stock repurchased										(94,140)
Contributions (distributions)											1,220
Net income	1,384,954			1,381,062							3,892
Dividends ($0.89, $1.34, and $0.31 per share, respectively)				(235,192)
Other comprehensive loss, net of tax	(982,624)					(982,624)			1,179		(2)
End of period at Dec. 31, 2022	$ 6,768,161		$ 997,534	$ 10,161,005		$ (1,264,581)	$ (892,905)		$ (371,676)	$ (3,251,429)	$ 19,829