CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common stock $1 par value	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock
Balance at Dec. 31, 2020	$ 3,385,773	$ 258,982	$ 868,882	$ 8,608,284	$ (153,254)	$ (6,197,121)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	232,769			232,769
Dividends paid	(71,344)			(71,344)
Common stock issued for the exercise of share-based awards	(30,453)	356	(30,809)
Stock-based compensation expense	11,521		11,521
Common stock acquired	(21,637)					(21,637)
Other comprehensive loss, net of tax	(7,476)				(7,476)
Other, net	(9)		(9)
Balance at Mar. 31, 2021	3,499,144	259,338	849,585	8,769,709	(160,730)	(6,218,758)
Balance at Dec. 31, 2021	4,189,528	259,457	857,636	9,445,245	(154,052)	(6,218,758)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	226,153			226,153
Dividends paid	(72,203)			(72,203)
Common stock issued for the exercise of share-based awards	(10,046)	116	(10,162)
Stock-based compensation expense	11,113		11,113
Other comprehensive loss, net of tax	(14,769)				(14,769)
Balance at Mar. 31, 2022	$ 4,329,776	$ 259,573	$ 858,587	$ 9,599,195	$ (168,821)	$ (6,218,758)