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	Accumulated Other Comprehensive (Loss) Income Cumulative Effect, Period Of Adoption, Adjustment	Unrealized investment gains (losses	Unrealized investment gains (losses Cumulative Effect, Period Of Adoption, Adjustment	Currency Translation Adjustments	Currency Translation Adjustments Cumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	Noncontrolling Interests
Beginning of period at Dec. 31, 2018		$ 70,535	$ 1,039,633	$ 7,558,619	$ 0			$ (91,491)	$ 0	$ (418,979)		$ (2,720,466)	$ 41,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(32,370)
Restricted stock units expensed			48,779
Change in controlling financial interest of a subsidiary			0
Change in unrealized (losses) gains on securities without an allowance for expected credit losses	$ 215,902							215,636
Change in unrealized gains on securities with an allowance for expected credit losses								369
Net change in period	37,166									37,166
Stock exercised/vested												11,431
Stock issued												549
Stock repurchased												(18,225)
Distributions													(688)
Net income	683,985			681,944									2,041
Dividends ($2.01, $0.47, and $1.68 per share, respectively)				(308,191)
Other comprehensive (loss) income, net of tax	253,068												103
End of period at Dec. 31, 2019		70,535	1,056,042	7,932,372	(30,514)	$ (257,299)	$ 24,952	124,514	24,952	(381,813)	$ 0	(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 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)
Distributions													(30,721)
Net income	532,985			530,670									2,315
Dividends ($2.01, $0.47, and $1.68 per share, respectively)				(84,147)
Other comprehensive (loss) income, net of tax	170,177					170,177				29,927			(2)
End of period at Dec. 31, 2020	6,325,797	$ 70,535	1,012,483	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 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)
Distributions													(8,799)
Net income	1,031,015			1,022,490									8,525
Dividends ($2.01, $0.47, and $1.68 per share, respectively)				(355,736)
Other comprehensive (loss) income, net of tax	(219,781)					(219,781)				(20,969)			(2)
End of period at Dec. 31, 2021	$ 6,667,730		$ 1,016,372	$ 9,015,135		$ (281,955)		$ 90,900		$ (372,855)		$ (3,167,076)	$ 14,719