Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 710,663	$ 687,326
Marketable securities	51,589	0
Accounts receivable, net of allowances of $1,248 and $1,529, respectively	135,119	144,263
Inventories	84,030	92,129
Prepaid expenses and other current assets	41,732	50,610
Total current assets	1,023,133	974,328
Property and equipment, net	79,944	79,706
Investments	36,636	36,636
Deferred tax assets	50,026	48,429
Other assets	20,208	20,791
TOTAL ASSETS	1,209,947	1,159,890
CURRENT LIABILITIES:
Accounts payable	24,808	43,966
Accrued liabilities	46,113	60,971
Deferred revenue	135,524	122,049
Other current liabilities	7,819	8,025
Total current liabilities	214,264	235,011
Income taxes payable	14,918	14,060
Lease financing obligations, non-current	40,827	41,210
Deferred revenue, non-current	83,696	74,759
Other long-term liabilities	6,385	6,698
TOTAL LIABILITIES	$ 360,090	$ 371,738
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.0001 par value—100,000 shares authorized, no shares issued and outstanding as of March 31, 2016 and December 31, 2015	$ 0	$ 0
Common stock, $0.0001 par value—1,000,000 shares authorized as of March 31, 2016 and December 31, 2015; 68,556 and 68,132 shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	7	7
Additional paid-in capital	564,342	537,904
Retained earnings	286,161	250,916
Accumulated other comprehensive loss	(653)	(675)
TOTAL STOCKHOLDERS’ EQUITY	849,857	788,152
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,209,947	$ 1,159,890