Computation of Earnings Per Share - Calculations Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income used for calculating basic and diluted income per share	$ 793,560	$ 266,745	$ 233,290
Denominator:
Weighted average common shares used in the calculation of basic income per share (in shares)	85,026	89,315	89,817
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares)	1,151	702	1,154
Shares used in the calculation of diluted income per share (in shares)	86,177	90,017	90,971
Income per share:
Basic (in dollars per share)	$ 9.33	$ 2.99	$ 2.60
Diluted (in dollars per share)	9.21	2.96	2.56
Sale of intellectual property, income tax benefit (in dollars per share)	$ 0.63	$ 0.31	$ 0.42