Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated Other Comprehensive Income (Loss)	Unrealized investment gain	Currency Translation Adjustments	Treasury stock	Noncontrolling interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment resulting from changes in accounting principles		$ 105,803	$ 997,534	$ 10,161,005	$ (1,264,581)	$ (892,905)	$ (371,676)	$ (3,251,429)	$ 19,829
Beginning of period at Dec. 31, 2022		105,803	997,534	10,161,005	(1,264,581)	(892,905)	(371,676)	(3,251,429)	19,829
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(1,200)
Restricted stock units expensed			11,794
Net income before noncontrolling interests	$ 295,729			294,126					1,603
Dividends ($0.11 and $0.60 per share, respectively)				(158,592)
Change in unrealized (losses) gains on securities without an allowance for expected credit losses	180,799					177,342
Change in unrealized gains on securities with an allowance for expected credit losses						3,456
Net change in period	4,866						4,866
Stock exercised/vested								395
Stock repurchased								(135,152)
Other	(1,352)
Contributions									177
Other comprehensive loss, net of tax	$ 185,665				185,665		4,866		(1)
End of period at Mar. 31, 2023			1,008,128	10,296,539	(1,078,917)	(712,107)	(366,810)	(3,387,538)	21,608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends, per share, cash paid (in dollars per share)	$ 0.60
Cumulative effect adjustment resulting from changes in accounting principles			1,008,128	10,296,539	(1,078,917)	(712,107)	(366,810)	(3,387,538)	21,608
Cumulative effect adjustment resulting from changes in accounting principles	$ 7,469,237	105,803	1,017,691	11,040,908	(925,838)	(586,354)	(339,484)	(3,783,133)	13,806
Beginning of period at Dec. 31, 2023	7,469,237	$ 105,803	1,017,691	11,040,908	(925,838)	(586,354)	(339,484)	(3,783,133)	13,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(195)
Restricted stock units expensed			12,979
Net income before noncontrolling interests	442,035			442,471					(436)
Dividends ($0.11 and $0.60 per share, respectively)				(28,221)
Change in unrealized (losses) gains on securities without an allowance for expected credit losses	(70,122)					(71,109)
Change in unrealized gains on securities with an allowance for expected credit losses						987
Net change in period	(27,570)						(27,570)
Stock exercised/vested								59
Stock repurchased								0
Other	0
Contributions									310
Other comprehensive loss, net of tax	(97,692)				(97,692)		(27,570)		0
End of period at Mar. 31, 2024	$ 7,798,512		1,030,475	11,455,158	(1,023,530)	(656,476)	(367,054)	(3,783,074)	13,680
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends, per share, cash paid (in dollars per share)	$ 0.11
Cumulative effect adjustment resulting from changes in accounting principles	$ 7,798,512		$ 1,030,475	$ 11,455,158	$ (1,023,530)	$ (656,476)	$ (367,054)	$ (3,783,074)	$ 13,680