Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 180,366	$ 138,431
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	12,658	10,208
Stock-based compensation	37,553	27,556
Noncash lease expense	4,243	4,073
Deferred income taxes	1,425	457
Amortization of investment premiums	5,446	1,042
Changes in operating assets and liabilities:
Accounts receivable, net	9,074	46,329
Inventories	(3,500)	(17,691)
Prepaid expenses and other current assets	(15,272)	25,751
Other assets	(3,499)	3,946
Accounts payable	2,833	(6,386)
Accrued liabilities	(20,759)	(39,450)
Deferred revenue	69,204	21
Income taxes payable	(10,436)	3,982
Other liabilities	(14,661)	(3,422)
Net cash provided by operating activities	254,675	194,847
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of marketable securities	379,605	414,503
Purchases of marketable securities	(590,476)	(674,649)
Business acquisitions, net of cash acquired	0	(66,225)
Purchases of property and equipment	(5,096)	(3,107)
Escrow receipts from past business acquisitions	18	0
Purchases of investments in privately-held companies	(2,000)	0
Net cash used in investing activities	(217,949)	(329,478)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock under equity plans	18,081	17,082
Tax withholding paid on behalf of employees for net share settlement	(2,496)	(1,740)
Repurchase of common stock	(101,355)	(227,895)
Net cash used in financing activities	(85,770)	(212,553)
Effect of exchange rate changes	(838)	(2,691)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(49,882)	(349,875)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —Beginning of period	897,454	1,115,515
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	847,572	765,640
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Property and equipment included in accounts payable and accrued liabilities	$ 1,529	$ 524

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