Accounting Policies - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Net income	$ 523,710	$ 454,627	$ 433,887
Weighted average shares outstanding - basic	87,051	87,100	85,840
Dilutive effect of stock plans	439	1,002	1,448
Weighted average shares outstanding - diluted	87,490	88,102	87,288
Basic earnings per share	$ 6.02	$ 5.22	$ 5.05
Diluted earnings per share	$ 5.99	$ 5.16	$ 4.97
Anti-dilutive shares	300	23	23