CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 161,753	$ 199,871
Marketable securities, short-term	276,789	254,787
Accounts receivable, net of allowances for doubtful accounts and returns of $1,548 and $1,563, respectively	146,466	129,751
Inventories	16,415	15,928
Prepaid expenses and other current assets	26,511	19,770
Deferred Tax Assets, Net, Current	29,972	37,053
Total current assets	657,906	657,160
Marketable securities, long-term	158,161	147,892
Property, plant and equipment, net	108,029	90,125
Goodwill and intangible assets, net	80,590	82,056
Deferred tax assets	16,014	3,099
Other assets	7,881	7,665
Total assets	1,028,581	987,997
Current liabilities:
Accounts payable	29,513	23,247
Accrued liabilities	91,992	87,880
Deferred revenues	101,420	90,684
Total current liabilities	222,925	201,811
Taxes Payable	33,726	30,483
Other long-term liabilities	2,129	2,932
Total liabilities	$ 258,780	$ 235,226
Commitments and contingencies (Note 6 and 7)
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; 80,069 and 80,205 issued and outstanding, respectively)	8	8
Additional paid-in capital	775,806	783,410
Accumulated other comprehensive loss, net	(187)	(140)
Accumulated deficit	(5,826)	(30,507)
Total stockholders’ equity	769,801	752,771
Total liabilities and stockholders’ equity	$ 1,028,581	$ 987,997