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				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income used for calculating basic and diluted income per share	$ 204,925	$ 172,515	$ 271,236	$ 164,100	$ 377,440	$ 435,336
Denominator:
Weighted average number of common shares used in the calculation of basic income per share (in shares)	80,271		85,712		81,145	87,032
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares)	703		877		866	889
Shares used in the calculation of diluted income per share (in shares)	80,974		86,589		82,011	87,921
Basic income per share (in dollars per share)	$ 2.55		$ 3.16		$ 4.65	$ 5.00
Diluted income per share (in dollars per share)	$ 2.53		$ 3.13		$ 4.60	$ 4.95