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, 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)	645,526				408,042	237,484
Common dividends declared	(20,543)					(20,543)
Acquisition of treasury stock	(119,482)						(119,482)
Stock-based compensation	9,035			2,504		(345)	6,876
Exercise of stock options	25,931					(9,964)	35,895
Ending balance at Mar. 31, 2022	2,544,275	0	109,218	523,068	(3,827,006)	6,662,365	(923,370)
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)