Accounting Policies - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Net income	$ 500,412	$ 523,710	$ 454,627
Weighted average shares outstanding - basic	86,833	87,051	87,100
Dilutive effect of stock plans	553	439	1,002
Weighted average shares outstanding - diluted	87,386	87,490	88,102
Basic earnings per share	$ 5.76	$ 6.02	$ 5.22
Diluted earnings per share	$ 5.73	$ 5.99	$ 5.16
Anti-dilutive shares	218	300	23