CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period at Dec. 31, 2018		$ 394,567			$ 270,447	$ 124,120
Balance at beginning of period (in shares) at Dec. 31, 2018	[1]			438,642
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member
Exercise of common stock options		$ 29,874			29,874
Exercise of common stock options (in shares)	[1]			12,641
Stock-based compensation		82,346			82,346
Issuance of common stock under employee stock purchase plan		16,746			16,746
Issuance of common stock under employee stock purchase plan (in shares)	[1]			2,870
Issuance of restricted stock, net of forfeitures and shares withheld for taxes		(19,334)			(19,334)
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)	[1]			603
Net income		108,318				108,318
Balance at end of period at Dec. 31, 2019		$ 612,517	$ (388)		380,079	232,438	$ (388)
Balance at end of period (in shares) at Dec. 31, 2019	[1]			454,755
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Exercise of common stock options		$ 76,146			76,146
Exercise of common stock options (in shares)	[1]			15,448
Stock-based compensation		114,020			114,020
Issuance of common stock under employee stock purchase plan		21,671			21,671
Issuance of common stock under employee stock purchase plan (in shares)	[1]			2,685
Issuance of restricted stock, net of forfeitures and shares withheld for taxes		(53,138)			(53,138)
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)	[1]			513
Net income		242,317				242,317
Balance at end of period at Dec. 31, 2020		$ 1,013,145			538,778	474,367
Balance at end of period (in shares) at Dec. 31, 2020	[1]			473,401
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201912Member
Exercise of common stock options		$ 61,476			61,476
Exercise of common stock options (in shares)	[1]			7,361
Stock-based compensation		340,733			340,733
Issuance of common stock under employee stock purchase plan		29,229			29,229
Issuance of common stock under employee stock purchase plan (in shares)	[1]			1,719
Issuance of restricted stock, net of forfeitures and shares withheld for taxes		(56,855)			(56,855)
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)	[1]			935
Issuance of restricted stock related to acquisition		1,816			1,816
Issuance of common stock related to acquisition (in shares)	[1]			25
Net income		137,762				137,762
Balance at end of period at Dec. 31, 2021		$ 1,527,306			$ 915,177	$ 612,129
Balance at end of period (in shares) at Dec. 31, 2021	[1]			483,441

[1] Refer to Note 9—Capitalization for discussion of the Company’s two classes of common stock.