CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 238,700	$ 312,192
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	293,199	269,186
Stock-based compensation	108,109	104,786
(Benefit) provision for deferred income taxes	(43,464)	7,225
Amortization of debt discount and issuance costs	2,210	32,717
Loss on investments	15,895	11,514
Other non-cash reconciling items, net	22,643	2,140
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(3,947)	(4,404)
Prepaid expenses and other current assets	(38,132)	(10,849)
Accounts payable and accrued expenses	(59,975)	(83,059)
Deferred revenue	26,178	18,094
Other current liabilities	(5,901)	(16,230)
Other non-current assets and liabilities	8,367	(15,386)
Net cash provided by operating activities	563,882	627,926
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(872,099)	(15,638)
Purchases of property and equipment	(125,220)	(194,453)
Capitalization of internal-use software development costs	(124,306)	(124,835)
Purchases of short- and long-term marketable securities	0	(382,236)
Proceeds from sales of short- and long-term marketable securities	573,274	7,596
Proceeds from maturities and redemptions of short- and long-term marketable securities	120,433	513,850
Other, net	(4,206)	(212)
Net cash used in investing activities	(432,124)	(195,928)
Cash flows from financing activities:
Net proceeds from borrowings and repayments under revolving credit facility	75,000	0
Proceeds related to the issuance of common stock under stock plans	29,145	31,122
Employee taxes paid related to net share settlement of stock-based awards	(63,142)	(76,260)
Repurchases of common stock	(267,642)	(154,416)
Other, net	(104)	(67)
Net cash used in financing activities	(226,743)	(199,621)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(15,260)	(4,148)
Net (decrease) increase in cash, cash equivalents and restricted cash	(110,245)	228,229
Cash, cash equivalents and restricted cash at beginning of period	537,751	353,466
Cash, cash equivalents and restricted cash at end of period	427,506	581,695
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds received of $2,061 and $6,550 for the six months ended June 30, 2022 and 2021, respectively	113,082	56,995
Cash paid for interest expense	2,875	2,875
Cash paid for operating lease liabilities	111,601	117,632
Non-cash activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	78,189	131,962
Purchases of property and equipment and capitalization of internal-use software development costs included in accounts payable and accrued expenses	39,075	43,520
Capitalization of stock-based compensation	16,180	19,524
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	426,710	581,068
Restricted cash	796	627
Cash, cash equivalents and restricted cash	$ 427,506	$ 581,695