CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 490,362	$ 636,899
Marketable securities, short-term	292,011	98,460
Accounts receivable, net of allowance for doubtful accounts of $5,572 and $2,378, respectively	531,816	439,009
Inventories	94,795	55,641
Prepaid expenses and other current assets	96,595	72,470
Total current assets	1,505,579	1,302,479
Marketable securities, long-term	0	9,112
Property, plant and equipment, net	606,581	521,329
Operating lease right-of-use assets, net	53,923	0
Equity method investments	0	45,913
Goodwill and intangible assets, net	77,012	81,949
Deferred tax assets	63,150	64,689
Other assets	44,135	26,987
Total assets	2,350,380	2,052,458
Current liabilities:
Accounts payable	63,300	64,256
Accrued liabilities	286,132	234,679
Deferred revenues	520,712	393,138
Total current liabilities	870,144	692,073
Income tax payable	101,914	78,008
Operating lease liabilities	43,365	0
Other long-term liabilities	29,408	29,486
Total liabilities	1,044,831	799,567
Commitments and contingencies (Notes 9 and 10)
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; 78,809 and 79,778 issued and outstanding, respectively)	8	8
Additional paid-in capital	892,309	877,514
Accumulated other comprehensive income (loss), net	(1,927)	(2,774)
Retained earnings	415,159	378,143
Total stockholders’ equity	1,305,549	1,252,891
Total liabilities and stockholders’ equity	$ 2,350,380	$ 2,052,458