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, 2021	$ 2,003,808	$ 0	$ 109,218	$ 520,564	$ (4,235,048)	$ 6,455,733	$ (846,659)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	2,339,121				1,444,735	894,386
Common dividends declared	(80,956)					(80,956)
Acquisition of treasury stock	(454,638)						(454,638)
Stock-based compensation	35,650			29,119		(345)	6,876
Exercise of stock options	106,592					(29,838)	136,430
Retirement of treasury stock	0		(4,000)	(20,022)		(344,445)	368,467
Ending 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)