Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net income used for calculating basic and diluted income per share	$ 222,344	$ 210,939
Denominator:
Weighted average number of common shares used in the calculation of basic income per share (in shares)	69,796	77,357
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares)	169	433
Shares used in the calculation of diluted income per share (in shares)	69,965	77,790
Basic income per share (in dollars per share)	$ 3.19	$ 2.73
Diluted income per share (in dollars per share)	$ 3.18	$ 2.71
Antidilutive securities excluded from computation of (loss) income per share (in shares)	800	200