Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Net earnings	$ 286,026	$ 263,756	$ 801,797	$ 761,033
Basic earnings per common share:
Net earnings (in dollars per share)	$ 2.01	$ 1.83	$ 5.59	$ 5.29
Weighted average shares outstanding (in shares)	142,506	143,976	143,469	143,895
Diluted earnings per common share:
Net earnings (in dollars per share)	$ 2.00	$ 1.81	$ 5.55	$ 5.24
Weighted average shares outstanding (in shares)	143,257	145,440	144,413	145,220
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]
Weighted average shares outstanding - basic (in shares)	142,506	143,976	143,469	143,895
Dilutive effect of assumed exercise of SARs and vesting of performance shares and RSUs (in shares)	751	1,464	944	1,325
Weighted average shares outstanding - diluted (in shares)	143,257	145,440	144,413	145,220
Antidilutive securities excluded from computation of earnings per share	19	1	28	57