Computation of Earnings Per Share - Calculations Of Basic And Diluted (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income used for calculating basic and diluted income per share	$ 172,515	$ 164,100
Denominator:
Weighted average number of common shares used in the calculation of basic income per share (in shares)	82,020	88,352
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares)	953	787
Shares used in the calculation of diluted income per share (in shares)	82,973	89,139
Basic income per share (in dollars per share)	$ 2.10	$ 1.86
Diluted income per share (in dollars per share)	$ 2.08	$ 1.84