Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, Net	Accumulated Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2018	$ 850,757	$ 82	$ 1,823,710	$ (39,867)	$ 1,755,432	$ (2,688,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	233,290				233,290
Other comprehensive income (loss)	(38,071)			(38,071)
Issuances under stock plans	17,649		6,555			11,094
Common share repurchases	(194,040)					(194,040)
Stock-based compensation expense	69,008		69,008
Ending Balance at Dec. 31, 2019	938,593	82	1,899,273	(77,938)	1,988,722	(2,871,546)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	266,745				266,745
Other comprehensive income (loss)	(21,290)			(21,290)
Issuances under stock plans	18,143		7,117			11,026
Common share repurchases	(174,303)					(174,303)
Stock-based compensation expense	62,540		62,540
Ending Balance at Dec. 31, 2020	1,090,428	82	1,968,930	(99,228)	2,255,467	(3,034,823)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	793,560				793,560
Other comprehensive income (loss)	17,797			17,797
Issuances under stock plans	18,250		7,396			10,854
Common share repurchases	(1,647,547)					(1,647,547)
Stock-based compensation expense	98,570		98,570
Ending Balance at Dec. 31, 2021	$ 371,058	$ 82	$ 2,074,896	$ (81,431)	$ 3,049,027	$ (4,671,516)