Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2019		189,461
Beginning balance at Dec. 31, 2019	$ 2,128,000	$ 0	$ 2,455,000	$ (352,000)	$ 25,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee stock plans (in shares)	1,200	1,239
Common stock issued under employee stock plans	$ 67,000		67,000
Taxes paid related to net share settlement of equity awards	(126,000)		(126,000)
Stock-based compensation	189,000		189,000
Settlement of 2022 Notes conversion feature	(4,000)		(4,000)
Benefit from exercise of 2022 Note Hedge	4,000		4,000
Other comprehensive income (loss), net	(40,000)				(40,000)
Net income	48,231			48,000
Ending balance (in shares) at Mar. 31, 2020		190,700
Ending balance at Mar. 31, 2020	2,266,000	$ 0	2,585,000	(304,000)	(15,000)
Beginning balance (in shares) at Dec. 31, 2020		195,845
Beginning balance at Dec. 31, 2020	$ 2,834,000	$ 0	2,974,000	(234,000)	94,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee stock plans (in shares)	1,100	1,066
Common stock issued under employee stock plans	$ 94,000	$ 0	94,000
Taxes paid related to net share settlement of equity awards	(191,000)		(191,000)
Stock-based compensation	256,000		256,000
Settlement of Warrants (in shares)		536
Settlement of Warrants	0
Settlement of 2022 Notes conversion feature	(102,000)		(102,000)
Benefit from exercise of 2022 Note Hedge	102,000		102,000
Other comprehensive income (loss), net	(38,000)				(38,000)
Net income	82,440			82,000
Ending balance (in shares) at Mar. 31, 2021		197,447
Ending balance at Mar. 31, 2021	$ 3,037,000	$ 0	$ 3,133,000	$ (152,000)	$ 56,000