CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative-effect adjustment from adoption of new accounting pronouncement	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative-effect adjustment from adoption of new accounting pronouncement	Accumulated Other Comprehensive Loss	Treasury Stock	Retained Earnings	Retained Earnings Cumulative-effect adjustment from adoption of new accounting pronouncement
Beginning balance (in shares) at Dec. 31, 2020			162,709,720
Beginning balance at Dec. 31, 2020	$ 4,251,296		$ 1,627	$ 3,664,820		$ (20,201)	$ 0	$ 605,050
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			1,665,123
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(88,747)		$ 16	(88,763)
Issuance of common stock under employee stock purchase plan (in shares)			358,384
Issuance of common stock under employee stock purchase plan	31,531		$ 4	31,527
Stock-based compensation	182,039			182,039
Repurchases of common stock (in shares)			(2,308,787)
Repurchases of common stock	(251,257)						(251,257)
Net income	491,108							491,108
Foreign currency translation adjustments	(28,444)					(28,444)
Change in unrealized loss on investments, net of tax	(5,081)					(5,081)
Ending balance (in shares) at Sep. 30, 2021			162,424,440
Ending balance at Sep. 30, 2021	4,582,445		$ 1,647	3,789,623		(53,726)	(251,257)	1,096,158
Beginning balance (in shares) at Jun. 30, 2021			163,018,768
Beginning balance at Jun. 30, 2021	4,476,657		$ 1,645	3,743,743		(31,557)	(154,416)	917,242
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			252,204
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(11,866)		$ 2	(11,868)
Stock-based compensation	57,748			57,748
Repurchases of common stock (in shares)			(846,532)
Repurchases of common stock	(96,841)						(96,841)
Net income	178,916							178,916
Foreign currency translation adjustments	(21,160)					(21,160)
Change in unrealized loss on investments, net of tax	(1,009)					(1,009)
Ending balance (in shares) at Sep. 30, 2021			162,424,440
Ending balance at Sep. 30, 2021	$ 4,582,445		$ 1,647	3,789,623		(53,726)	(251,257)	1,096,158
Beginning balance (in shares) at Dec. 31, 2021	160,512,111		160,512,111
Beginning balance at Dec. 31, 2021	$ 4,530,014	$ (235,427)	$ 1,605	3,340,822	$ (375,414)	(69,105)	0	1,256,692	$ 139,987
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			1,376,712
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(72,770)		$ 14	(72,784)
Issuance of common stock under employee stock purchase plan (in shares)			335,644
Issuance of common stock under employee stock purchase plan	29,308		$ 3	29,305
Stock-based compensation	183,041			183,041
Repurchases of common stock (in shares)			(4,347,856)
Repurchases of common stock	(430,269)						(430,269)
Net income	346,854							346,854
Foreign currency translation adjustments	(86,321)					(86,321)
Change in unrealized loss on investments, net of tax	$ (31,246)					(31,246)
Ending balance (in shares) at Sep. 30, 2022	157,876,611		157,876,611
Ending balance at Sep. 30, 2022	$ 4,233,184		$ 1,622	3,104,970		(186,672)	(430,269)	1,743,533
Beginning balance (in shares) at Jun. 30, 2022			159,469,828
Beginning balance at Jun. 30, 2022	4,280,478		$ 1,620	3,054,200		(143,079)	(267,642)	1,635,379
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			195,331
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(8,242)		$ 2	(8,244)
Stock-based compensation	59,014			59,014
Repurchases of common stock (in shares)			(1,788,548)
Repurchases of common stock	(162,627)						(162,627)
Net income	108,154							108,154
Foreign currency translation adjustments	(39,079)					(39,079)
Change in unrealized loss on investments, net of tax	$ (4,514)					(4,514)
Ending balance (in shares) at Sep. 30, 2022	157,876,611		157,876,611
Ending balance at Sep. 30, 2022	$ 4,233,184		$ 1,622	$ 3,104,970		$ (186,672)	$ (430,269)	$ 1,743,533