Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 531,058	$ 687,326
Marketable securities	292,760	0
Accounts receivable, net of allowances of $1,348 and $1,529, respectively	146,659	144,263
Inventories	118,130	92,129
Prepaid expenses and other current assets	53,447	50,610
Total current assets	1,142,054	974,328
Property and equipment, net	79,681	79,706
Investments	39,136	36,636
Deferred tax assets	55,305	48,429
Other assets	18,812	20,791
TOTAL ASSETS	1,334,988	1,159,890
CURRENT LIABILITIES:
Accounts payable	60,097	43,966
Accrued liabilities	55,110	60,971
Deferred revenue	138,885	122,049
Other current liabilities	9,347	8,025
Total current liabilities	263,439	235,011
Income taxes payable	16,086	14,060
Lease financing obligations, non-current	40,438	41,210
Deferred revenue, non-current	91,439	74,759
Other long-term liabilities	6,754	6,698
TOTAL LIABILITIES	418,156	371,738
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.0001 par value—100,000 shares authorized, no shares issued and outstanding as of June 30, 2016 and December 31, 2015	0	0
Common stock, $0.0001 par value—1,000,000 shares authorized as of June 30, 2016 and December 31, 2015; 69,195 and 68,132 shares issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	7	7
Additional paid-in capital	592,465	537,904
Retained earnings	325,065	250,916
Accumulated other comprehensive loss	(705)	(675)
TOTAL STOCKHOLDERS’ EQUITY	916,832	788,152
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,334,988	$ 1,159,890