Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 82,440	$ 48,231
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	106,000	76,000
Amortization of deferred commissions	66,000	49,000
Amortization of debt discount and issuance costs	2,000	9,000
Stock-based compensation	256,000	188,000
Deferred income taxes	1,000	(2,000)
Repayments of convertible senior notes attributable to debt discount	(7,000)	0
Other	15,000	3,000
Changes in operating assets and liabilities, net of effect of business combinations:
Accounts receivable	354,000	209,000
Deferred commissions	(114,000)	(71,000)
Prepaid expenses and other assets	(3,000)	(20,000)
Accounts payable	89,000	21,000
Deferred revenue	75,000	60,000
Accrued expenses and other liabilities	(195,000)	(78,000)
Net cash provided by operating activities	727,000	492,000
Cash flows from investing activities:
Purchases of property and equipment	(107,000)	(83,000)
Business combinations, net of cash acquired	(225,000)	(83,000)
Purchases of investments	(644,000)	(528,000)
Sales and maturities of investments	532,000	313,000
Other	7,000	(4,000)
Net cash used in investing activities	(437,000)	(385,000)
Cash flows from financing activities:
Repayments of convertible senior notes attributable to principal	(28,000)	(2,000)
Proceeds from employee stock plans	95,000	67,000
Taxes paid related to net share settlement of equity awards	(191,000)	(126,000)
Net cash used in financing activities	(124,000)	(61,000)
Foreign currency effect on cash, cash equivalents and restricted cash	(18,000)	(11,000)
Net increase in cash, cash equivalents and restricted cash	148,000	35,000
Cash, cash equivalents and restricted cash at beginning of period	1,679,000	778,000
Cash, cash equivalents and restricted cash at end of period	1,827,000	813,000
Cash, cash equivalents and restricted cash at end of period:
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	1,827,000	813,000
Supplemental disclosures of other cash flow information:
Interest paid	15,000	0
Income taxes paid, net of refunds	12,000	7,000
Non-cash investing and financing activities:
Settlement of 2022 Notes conversion feature	102,000	4,000
Benefit from exercise of 2022 Note Hedge	102,000	4,000
Property and equipment included in accounts payable and accrued expenses	$ 28,000	$ 41,000