Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 140,835	$ 88,997
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	221,000	159,000
Amortization of deferred commissions	136,000	101,000
Stock-based compensation	537,000	405,000
Deferred income taxes	(16,000)	(3,000)
Repayments of convertible senior notes attributable to debt discount	(13,000)	(2,000)
Other	22,000	16,000
Changes in operating assets and liabilities, net of effect of business combinations:
Accounts receivable	224,000	200,000
Deferred commissions	(217,000)	(144,000)
Prepaid expenses and other assets	(57,000)	(32,000)
Accounts payable	75,000	38,000
Deferred revenue	85,000	69,000
Accrued expenses and other liabilities	(111,000)	(36,000)
Net cash provided by operating activities	1,027,000	860,000
Cash flows from investing activities:
Purchases of property and equipment	(198,000)	(194,000)
Business combinations, net of cash acquired	(738,000)	(83,000)
Purchases of investments	(1,139,000)	(1,108,000)
Sales and maturities of investments	1,023,000	766,000
Other	1,000	(9,000)
Net cash used in investing activities	(1,051,000)	(628,000)
Cash flows from financing activities:
Repayments of convertible senior notes attributable to principal	(53,000)	(16,000)
Proceeds from employee stock plans	95,000	91,000
Taxes paid related to net share settlement of equity awards	(315,000)	(239,000)
Net cash used in financing activities	(273,000)	(164,000)
Foreign currency effect on cash, cash equivalents and restricted cash	(11,000)	(5,000)
Net change in cash, cash equivalents and restricted cash	(308,000)	63,000
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	1,371,000	841,000
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents	1,362,000	837,000
Restricted cash included in prepaid expenses and other current assets	9,000	4,000
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	1,371,000	841,000
Supplemental disclosures of other cash flow information:
Interest paid	15,000	0
Income taxes paid, net of refunds	20,000	10,000
Non-cash investing and financing activities:
Settlement of 2022 Notes conversion feature	191,000	23,000
Benefit from exercise of 2022 Note Hedge	191,000	22,000
Property and equipment included in accounts payable and accrued expenses	$ 49,000	$ 95,000