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						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income used for calculating basic and diluted income per share	$ 173,545	$ 204,925	$ 172,515	$ 148,865	$ 271,236	$ 164,100	$ 550,985	$ 584,201
Denominator:
Weighted average number of common shares used in the calculation of basic income per share (in shares)	79,259			83,566			80,516	85,877
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares)	800			1,200			857	1,048
Shares used in the calculation of diluted income per share (in shares)	80,059			84,766			81,373	86,925
Basic income per share (in dollars per share)	$ 2.19			$ 1.78			$ 6.84	$ 6.80
Diluted income per share (in dollars per share)	$ 2.17			$ 1.76			$ 6.77	$ 6.72