Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 651,642	$ 557,054	$ 478,035
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	550,632	478,389	440,674
Stock-based compensation	202,759	197,411	187,140
(Benefit) provision for deferred income taxes	(47,794)	(33,821)	933
Amortization of debt discount and issuance costs	66,025	62,823	45,857
Other non-cash reconciling items, net	21,823	23,027	8,528
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(24,096)	(90,381)	(64,471)
Prepaid expenses and other current assets	4,034	(25,395)	11,689
Accounts payable and accrued expenses	31,523	39,211	8,769
Deferred revenue	(2,865)	(1,318)	(13,547)
Other current liabilities	(20,404)	18,101	(17,230)
Other non-current assets and liabilities	(28,716)	(10,101)	(28,073)
Net cash provided by operating activities	1,404,563	1,215,000	1,058,304
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(598,825)	(127,999)	(165,329)
Cash paid for asset acquisition	0	(36,376)	0
Cash paid for equity method investment	0	0	(36,008)
Purchases of property and equipment	(328,969)	(514,313)	(359,667)
Capitalization of internal-use software development costs	(216,261)	(217,559)	(202,410)
Purchases of short-and long-term marketable securities	(932,604)	(1,782,849)	(1,990,148)
Proceeds from sales of short-and long-term marketable securities	442,133	30,350	856
Proceeds from maturities and redemptions of short-and long-term marketable securities	991,949	1,597,651	1,084,373
Other, net	(4,322)	8,121	399
Net cash used in investing activities	(646,899)	(1,042,974)	(1,667,934)
Cash flows from financing activities:
Proceeds from the issuance of convertible senior notes	0	0	1,135,629
Proceeds from the issuance of warrants	0	0	185,150
Purchase of note hedge related to convertible senior notes	0	0	(312,225)
Repayment of convertible senior notes	0	0	(690,000)
Proceeds related to the issuance of common stock under stock plans	59,632	59,775	57,112
Employee taxes paid related to net share settlement of stock-based awards	(99,112)	(89,828)	(75,266)
Repurchases of common stock	(522,255)	(193,588)	(334,519)
Other, net	(268)	0	(1,558)
Net cash used in financing activities	(562,003)	(223,641)	(35,677)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(11,376)	10,935	2,466
Net increase (decrease) in cash, cash equivalents and restricted cash	184,285	(40,680)	(642,841)
Cash, cash equivalents and restricted cash at beginning of year	353,466	394,146	1,036,987
Cash, cash equivalents and restricted cash at end of year	537,751	353,466	394,146
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds received in the years ended December 31, 2021, 2020 and 2019 of $14,808, $17,491 and $3,731, respectively	100,533	79,163	73,898
Cash paid for interest expense	5,750	5,954	1,438
Cash paid for operating lease liabilities	224,085	201,856	153,818
Non-cash activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	218,753	200,735	529,376
Purchases of property and equipment and capitalization of internal-use software development costs included in accounts payable and accrued expenses	63,309	75,666	88,238
Capitalization of stock-based compensation	36,545	38,333	35,905
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	536,725	352,917	393,745
Restricted cash	1,026	549	401
Cash, cash equivalents and restricted cash	$ 537,751	$ 353,466	$ 394,146