Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Net earnings	$ 228,574	$ 226,153
Basic earnings per common share:
Net earnings (in dollars per share)	$ 1.64	$ 1.57
Weighted average shares outstanding (in shares)	139,757	144,087
Diluted earnings per common share:
Net earnings (in dollars per share)	$ 1.63	$ 1.56
Weighted average shares outstanding (in shares)	140,616	145,329
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]
Weighted average shares outstanding - basic (in shares)	139,757	144,087
Dilutive effect of assumed exercise of SARs and vesting of performance shares and RSUs (in shares)	859	1,242
Weighted average shares outstanding - diluted (in shares)	140,616	145,329
Antidilutive securities excluded from computation of earnings per share	88	58