CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 199,871	$ 242,953
Marketable securities, short-term	254,787	127,040
Accounts receivable, net of allowance for doubtful accounts and returns of $1,563 and $1,733, respectively	129,751	113,250
Inventories	15,928	13,968
Prepaid expenses and other current assets	19,770	18,829
Deferred Tax Assets, Net, Current	37,053	28,636
Total current assets	657,160	544,676
Marketable securities, long-term	147,892	101,978
Property, plant and equipment, net	90,125	75,743
Goodwill	82,056	85,362
Deferred tax assets	3,099	15,766
Other assets	7,665	8,622
Total assets	987,997	832,147
Current liabilities:
Accounts payable	23,247	17,718
Accrued liabilities	87,880	80,345
Deferred revenues	90,684	77,275
Total current liabilities	201,811	175,338
Taxes Payable	30,483	18,326
Other long-term liabilities	2,932	4,513
Total liabilities	235,226	198,177
Commitments and contingencies (Notes 6 and 8)
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; 80,205 and 80,583 issued and outstanding at 2014 and 2013, respectively)	8	8
Additional paid-in capital	783,410	729,578
Accumulated other comprehensive income, net	(140)	294
Accumulated deficit	(30,507)	(95,910)
Total stockholders' equity	752,771	633,970
Total liabilities and stockholders' equity	$ 987,997	$ 832,147