Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income		$ 82,961	$ 35,245
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		4,939	4,779
Stock-based compensation		16,439	13,360
Deferred income taxes		2,521	(1,597)
Amortization of investment premiums		330	0
Changes in operating assets and liabilities:
Accounts receivable, net		44,057	9,144
Inventories		(50,296)	8,099
Prepaid expenses and other current assets		(29,051)	8,878
Other assets		69	533
Accounts payable		(18,648)	(16,123)
Accrued liabilities		(15,143)	(14,868)
Deferred revenue		124,236	22,412
Income taxes payable		2,923	6,802
Other liabilities		(2,475)	464
Net cash provided by operating activities	[1]	162,862	77,128
Cash flows from investing activities
Proceeds from marketable securities		64,488	0
Purchases of marketable securities		(61,511)	(51,638)
Purchases of property and equipment		(4,645)	(8,632)
Change in restricted cash		(1,252)	0
Net cash used in investing activities		(2,920)	(60,270)
Cash flows from financing activities
Principal payments of lease financing obligations		(383)	(314)
Proceeds from issuance of common stock under equity plans		19,481	6,750
Minimum tax withholding paid on behalf of employees for net share settlement		(580)	0
Net cash provided by financing activities	[1]	18,518	6,436
Effect of exchange rate changes		184	43
NET INCREASE IN CASH AND CASH EQUIVALENTS		178,644	23,337
CASH AND CASH EQUIVALENTS—Beginning of period		567,923	687,326
CASH AND CASH EQUIVALENTS—End of period		746,567	710,663
Supplemental disclosures of non-cash investing activities:
Property and equipment included in accounts payable and accrued liabilities		$ 971	$ 958

[1] During the three months ended March 31, 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 $6.0 million increase in net cash provided by operating activities and a corresponding $6.0 million decrease in net cash provided by financing activities for the three months ended March 31, 2016.