Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balances at Dec. 31, 2019	$ 1,671	$ 374,049	$ 4,592,938	$ (2,701,629)	$ 2,267,029
Net earnings	0	0	506,035	0	$ 506,035
Cash dividend declared and paid per share (in dollars per share)					$ 1.08
Cash dividend declared and paid	0	0	(114,234)	0	$ (114,234)
Purchase of treasury shares	0	0	0	(92,548)	(92,548)
Share-based compensation	0	60,698	0	0	60,698
Restricted share issuances, net of stock repurchased for payroll taxes and other	0	(26,503)	0	(339)	(26,842)
Balances at Dec. 31, 2020	1,671	408,244	4,984,739	(2,794,516)	2,600,138
Net earnings	0	0	760,806	0	$ 760,806
Cash dividend declared and paid per share (in dollars per share)					$ 1.18
Cash dividend declared and paid	0	0	(124,442)	0	$ (124,442)
Purchase of treasury shares	0	0	0	(151,720)	(151,720)
Share-based compensation	0	61,505	0	0	61,505
Restricted share issuances, net of stock repurchased for payroll taxes and other	0	(21,532)	0	(6,939)	(28,471)
Balances at Dec. 31, 2021	1,671	448,217	5,621,103	(2,953,175)	3,117,816
Net earnings	0	0	969,351	0	$ 969,351
Cash dividend declared and paid per share (in dollars per share)					$ 1.60
Cash dividend declared and paid	0	0	(166,724)	0	$ (166,724)
Purchase of treasury shares	0	0	0	(300,030)	(300,030)
Share-based compensation	0	77,535	0	0	77,535
Restricted share issuances, net of stock repurchased for payroll taxes and other	0	(25,855)	0	(5,325)	(31,180)
Balances at Dec. 31, 2022	$ 1,671	$ 499,897	$ 6,423,730	$ (3,258,530)	$ 3,666,768