Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Beginning balance at Dec. 31, 2022	$ 3,949,577	$ 0	$ 105,218	$ 529,661	$ (2,790,313)	$ 6,894,535	$ (789,524)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	988,649				17,894	970,755
Common dividends declared	(85,139)					(85,139)
Acquisition of treasury stock	(511,100)						(511,100)
Stock-based compensation	30,736			18,466			12,270
Exercise of stock options	114,080					(19,395)	133,475
Retirement of treasury stock	0		(3,000)	(15,653)		(281,943)	300,596
Ending balance at Dec. 31, 2023	4,486,803	0	102,218	532,474	(2,772,419)	7,478,813	(854,283)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	1,813,461				742,699	1,070,762
Common dividends declared	(84,539)					(84,539)
Acquisition of treasury stock	(1,002,109)						(1,002,109)
Stock-based compensation	40,118			22,277		(438)	18,279
Exercise of stock options	51,786					(6,358)	58,144
Retirement of treasury stock	0		(5,000)	(26,956)		(455,719)	487,675
Ending balance at Dec. 31, 2024	5,305,520	0	97,218	527,795	(2,029,720)	8,002,521	(1,292,294)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	1,419,514				258,276	1,161,238
Common dividends declared	(87,275)					(87,275)
Acquisition of treasury stock	(880,983)						(880,983)
Stock-based compensation	53,355			37,404			15,951
Exercise of stock options	164,448					(21,402)	185,850
Retirement of treasury stock	0		(5,000)	(28,836)		(508,275)	542,111
Ending balance at Dec. 31, 2025	$ 5,974,579	$ 0	$ 92,218	$ 536,363	$ (1,771,444)	$ 8,546,807	$ (1,429,365)