Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Net earnings	$ 289,753	$ 286,026	$ 760,566	$ 801,797
Basic earnings per common share:
Net earnings (in dollars per share)	$ 2.07	$ 2.01	$ 5.44	$ 5.59
Weighted average shares outstanding (in shares)	139,878	142,506	139,833	143,469
Diluted earnings per common share:
Net earnings (in dollars per share)	$ 2.06	$ 2.00	$ 5.41	$ 5.55
Weighted average shares outstanding (in shares)	140,615	143,257	140,603	144,413
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]
Weighted average shares outstanding - basic (in shares)	139,878	142,506	139,833	143,469
Dilutive effect of assumed exercise of SARs and vesting of performance shares and RSUs (in shares)	737	751	770	944
Weighted average shares outstanding - Diluted (in shares)	140,615	143,257	140,603	144,413
Antidilutive securities excluded from computation of earnings per share	39	19	54	28