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)			1,412,919
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	(76,881)		$ 14	(76,895)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			358,384
Issuance of common stock under employee stock purchase plan	31,531		$ 4	31,527
Stock-based compensation	124,291			124,291
Repurchases of common stock (in shares)			(1,462,255)
Repurchases of common stock	(154,416)						(154,416)
Net income	312,192							312,192
Foreign currency translation adjustments	(7,284)					(7,284)
Change in unrealized loss on investments, net of tax	(4,072)					(4,072)
Ending balance (in shares) at Jun. 30, 2021			163,018,768
Ending balance at Jun. 30, 2021	4,476,657		$ 1,645	3,743,743		(31,557)	(154,416)	917,242
Beginning balance (in shares) at Mar. 31, 2021			163,245,941
Beginning balance at Mar. 31, 2021	4,321,363		$ 1,638	3,664,568		(47,347)	(58,241)	760,745
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)			284,735
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	(12,875)		$ 3	(12,878)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			358,384
Issuance of common stock under employee stock purchase plan	31,531		$ 4	31,527
Stock-based compensation	60,526			60,526
Repurchases of common stock (in shares)			(870,292)
Repurchases of common stock	(96,175)						(96,175)
Net income	156,497							156,497
Foreign currency translation adjustments	16,981					16,981
Change in unrealized loss on investments, net of tax	(1,191)					(1,191)
Ending balance (in shares) at Jun. 30, 2021			163,018,768
Ending balance at Jun. 30, 2021	4,476,657		$ 1,645	3,743,743		(31,557)	(154,416)	917,242
Beginning balance (in shares) at Dec. 31, 2021			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)			1,181,381
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	(64,528)		$ 12	(64,540)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			335,644
Issuance of common stock under employee stock purchase plan	29,308		$ 3	29,305
Stock-based compensation	124,027			124,027
Repurchases of common stock (in shares)			(2,559,308)
Repurchases of common stock	(267,642)						(267,642)
Net income	238,700							238,700
Foreign currency translation adjustments	(47,242)					(47,242)
Change in unrealized loss on investments, net of tax	(26,732)					(26,732)
Ending balance (in shares) at Jun. 30, 2022			159,469,828
Ending balance at Jun. 30, 2022	4,280,478		$ 1,620	3,054,200		(143,079)	(267,642)	1,635,379
Beginning balance (in shares) at Mar. 31, 2022			160,535,769
Beginning balance at Mar. 31, 2022	4,300,522		$ 1,615	2,974,529		(88,611)	(102,853)	1,515,842
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)			233,231
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	(9,889)		$ 2	(9,891)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			335,644
Issuance of common stock under employee stock purchase plan	29,308		$ 3	29,305
Stock-based compensation	60,257			60,257
Repurchases of common stock (in shares)			(1,634,816)
Repurchases of common stock	(164,789)						(164,789)
Net income	119,537							119,537
Foreign currency translation adjustments	(49,278)					(49,278)
Change in unrealized loss on investments, net of tax	(5,190)					(5,190)
Ending balance (in shares) at Jun. 30, 2022			159,469,828
Ending balance at Jun. 30, 2022	$ 4,280,478		$ 1,620	$ 3,054,200		$ (143,079)	$ (267,642)	$ 1,635,379