CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 358,182	$ 389,275
Marketable securities, short-term	243,786	250,981
Accounts receivable, net of allowance for doubtful accounts and returns of $5,452 and $4,310, respectively	291,694	247,415
Inventories	35,133	27,131
Prepaid expenses and other current assets	74,427	38,176
Total current assets	1,003,222	952,978
Marketable securities, long-term	74,619	59,783
Property, plant and equipment, net	255,539	175,167
Equity method investments	41,724	45,061
Goodwill and intangible assets, net	91,308	81,998
Deferred tax assets	61,783	67,844
Other assets	22,992	13,320
Total assets	1,551,187	1,396,151
Current liabilities:
Accounts payable	45,953	28,596
Accrued liabilities	158,838	134,332
Deferred revenues	220,005	191,407
Total current liabilities	424,796	354,335
Income tax payable	44,581	45,133
Other long-term liabilities	3,522	1,294
Total liabilities	472,899	400,762
Commitments and contingencies (Note 8 and 9)
Stockholders' equity:
Preferred stock, $0.0001 par value (5,000 shares authorized; none issued)	0	0
Common stock, $0.0001 par value (200,000 shares authorized; 80,144 and 79,553 issued and outstanding, respectively)	8	8
Additional paid-in capital	845,560	864,871
Accumulated other comprehensive income (loss), net	(156)	(938)
Retained earnings	232,876	131,448
Total stockholders’ equity	1,078,288	995,389
Total liabilities and stockholders’ equity	$ 1,551,187	$ 1,396,151