Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income		$ 319,368	$ 125,406
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		15,355	14,807
Stock-based compensation		54,991	42,708
Deferred income taxes		(22,743)	(13,720)
Amortization of investment premiums		1,106	994
Changes in operating assets and liabilities:
Accounts receivable, net		40,508	(65,980)
Inventories		(96,667)	(69,998)
Prepaid expenses and other current assets		(20,973)	(98,050)
Other assets		(1,560)	3,208
Accounts payable		(46,075)	35,510
Accrued liabilities		4,175	15,913
Deferred revenue		192,210	88,027
Income taxes payable		7,421	27,275
Other liabilities		847	2,628
Net cash provided by operating activities	[1]	447,963	108,728
Cash flows from investing activities
Proceeds from marketable securities		135,483	41,917
Purchases of marketable securities		(325,414)	(342,484)
Purchases of property and equipment		(12,159)	(16,484)
Proceeds from repayment of notes receivable		3,000	0
Investment in privately-held companies		0	(2,500)
Change in restricted cash		(1,257)	0
Net cash used in investing activities		(200,347)	(319,551)
Cash flows from financing activities
Principal payments of lease financing obligations		(1,170)	(960)
Proceeds from issuance of common stock under equity plans		41,870	25,882
Minimum tax withholding paid on behalf of employees for net share settlement		(2,457)	(811)
Net cash provided by financing activities	[1]	38,243	24,111
Effect of exchange rate changes		697	(133)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		286,556	(186,845)
CASH AND CASH EQUIVALENTS—Beginning of period		567,923	687,326
CASH AND CASH EQUIVALENTS—End of period		854,479	500,481
Supplemental disclosures of non-cash investing activities:
Property and equipment included in accounts payable and accrued liabilities		$ 468	$ 1,313

[1] During our first fiscal quarter of 2017, we adopted Accounting Standards Update 2016-09, "Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." Refer to Note 1 Recently Adopted Accounting Pronouncements for further details. This adoption resulted in a $30.0 million increase in net cash provided by operating activities and a corresponding $30.0 million decrease in net cash provided by financing activities for the nine months ended September 30, 2016.