CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 449,511	$ 389,275
Marketable securities, short-term	272,031	250,981
Accounts receivable, net of allowance for doubtful accounts and returns of $7,178 and $4,310, respectively	322,825	247,415
Inventories	31,688	27,131
Prepaid expenses and other current assets	80,948	38,176
Total current assets	1,157,003	952,978
Marketable securities, long-term	39,948	59,783
Property, plant and equipment, net	348,793	175,167
Equity method investments	54,606	45,061
Goodwill and intangible assets, net	89,068	81,998
Deferred tax assets	50,059	67,844
Other assets	38,379	13,320
Total assets	1,777,856	1,396,151
Current liabilities:
Accounts payable	36,776	28,596
Accrued liabilities	194,198	134,332
Deferred revenues	266,842	191,407
Total current liabilities	497,816	354,335
Income tax payable	114,091	45,133
Other long-term liabilities	15,579	1,294
Total liabilities	627,486	400,762
Commitments and contingencies (Notes 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; 80,040 and 79,553 issued and outstanding, respectively)	8	8
Additional paid-in capital	886,435	864,871
Accumulated other comprehensive income (loss), net	571	(938)
Retained earnings	263,356	131,448
Total stockholders’ equity	1,150,370	995,389
Total liabilities and stockholders’ equity	$ 1,777,856	$ 1,396,151