Condensed 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)	52,830				(170,780)	223,610
Common dividends declared	(21,542)					(21,542)
Acquisition of treasury stock	(179,276)						(179,276)
Stock-based compensation	7,678			(1,022)			8,700
Exercise of stock options	37,024					(4,059)	41,083
Ending balance at Mar. 31, 2023	3,846,291	0	105,218	528,639	(2,961,093)	7,092,544	(919,017)
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)	1,027,292
Ending balance at Sep. 30, 2023	4,623,131	0	105,218	543,693	(2,458,974)	7,519,893	(1,086,699)
Beginning balance at Mar. 31, 2023	3,846,291	0	105,218	528,639	(2,961,093)	7,092,544	(919,017)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	232,456				17,196	215,260
Common dividends declared	(21,330)					(21,330)
Acquisition of treasury stock	(89,755)						(89,755)
Stock-based compensation	7,487			7,487		0	0
Exercise of stock options	5,157					(665)	5,822
Ending balance at Jun. 30, 2023	3,980,306	0	105,218	536,126	(2,943,897)	7,285,809	(1,002,950)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	742,006				484,923	257,083
Common dividends declared	(21,181)					(21,181)
Acquisition of treasury stock	(96,898)						(96,898)
Stock-based compensation	7,567			7,567			0
Exercise of stock options	11,331					(1,818)	13,149
Ending balance at Sep. 30, 2023	4,623,131	0	105,218	543,693	(2,458,974)	7,519,893	(1,086,699)
Beginning 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)	559,400				305,183	254,217
Common dividends declared	(22,603)					(22,603)
Acquisition of treasury stock	(23,469)						(23,469)
Stock-based compensation	9,267			(5,612)		(438)	15,317
Exercise of stock options	29,763					(3,334)	33,097
Ending balance at Mar. 31, 2024	5,039,161	0	102,218	526,862	(2,467,236)	7,706,655	(829,338)
Beginning 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)	1,103,242
Ending balance at Sep. 30, 2024	4,638,625	0	102,218	543,255	(2,484,743)	8,225,030	(1,747,135)
Beginning balance at Mar. 31, 2024	5,039,161	0	102,218	526,862	(2,467,236)	7,706,655	(829,338)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	535,971				277,616	258,355
Common dividends declared	(21,595)					(21,595)
Acquisition of treasury stock	(335,873)						(335,873)
Stock-based compensation	10,090			7,166			2,924
Exercise of stock options	0					0	0
Ending balance at Jun. 30, 2024	5,227,754	0	102,218	534,028	(2,189,620)	7,943,415	(1,162,287)
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)	7,871				(295,123)	302,994
Common dividends declared	(20,215)					(20,215)
Acquisition of treasury stock	(591,106)						(591,106)
Stock-based compensation	9,233			9,227			6
Exercise of stock options	5,088					(1,164)	6,252
Ending balance at Sep. 30, 2024	$ 4,638,625	$ 0	$ 102,218	$ 543,255	$ (2,484,743)	$ 8,225,030	$ (1,747,135)