Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 157,793	$ 319,368
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other		18,440	15,355
Stock-based compensation		66,583	54,991
Deferred income taxes		(49,615)	(22,743)
Unrealized loss on investments in privately-held companies, net		9,100	0
Amortization (accretion) of investment premiums (discounts)		(1,863)	1,106
Changes in operating assets and liabilities:
Accounts receivable, net		(68,192)	40,508
Inventories		98,284	(96,667)
Prepaid expenses and other current assets		(50,507)	(20,973)
Other assets		(767)	(1,560)
Accounts payable		30,515	(46,075)
Accrued liabilities		(35,917)	4,175
Deferred revenue		13,161	192,210
Income taxes payable		10,311	7,421
Other liabilities		9,974	847
Net cash provided by operating activities		207,300	447,963
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of marketable securities		366,999	135,483
Purchases of marketable securities		(827,198)	(325,414)
Business acquisitions, net of cash acquired		(95,640)	0
Purchases of property and equipment		(17,613)	(12,159)
Investments in privately-held companies		(8,000)	0
Proceeds from repayment of notes receivable		0	3,000
Other investing activities		(2,000)	0
Net cash used in investing activities	[1]	(583,452)	(199,090)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of lease financing obligations		(1,392)	(1,170)
Proceeds from issuance of common stock under equity plans		49,642	41,870
Tax withholding paid on behalf of employees for net share settlement		(6,914)	(2,457)
Net cash provided by financing activities		41,336	38,243
Effect of exchange rate changes		(984)	697
NET INCREASE/(DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(335,800)	287,813
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —Beginning of period		864,697	572,168
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	[2]	528,897	859,981
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING INFORMATION:
Common stock issued for business acquisition		15,555	0
Property and equipment included in accounts payable and accrued liabilities		$ 2,479	$ 468

[1] Net cash used in investing activities for the nine months ended September 30, 2017 was adjusted as a result of our adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, in the first quarter of 2018. See Note 1 of the accompanying notes for details of the adjustments.

[2] See Note 4 of the accompanying notes for a reconciliation of the ending balance of cash, cash equivalents and restricted cash as shown in this condensed consolidated statements of cash flows.