CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 189,978	$ 199,871
Marketable securities, short-term	254,823	254,787
Accounts receivable, net of allowances for doubtful accounts and returns of $1,461 and $1,563, respectively	138,159	129,751
Inventories	14,572	15,928
Prepaid expenses and other current assets	29,869	19,770
Deferred Tax Assets, Net, Current	29,911	37,053
Total current assets	657,312	657,160
Marketable securities, long-term	168,171	147,892
Property, plant and equipment, net	99,764	90,125
Goodwill and intangible assets, net	81,274	82,056
Deferred tax assets	14,630	3,099
Other assets	7,254	7,665
Total assets	1,028,405	987,997
Current liabilities:
Accounts payable	24,996	23,247
Accrued liabilities	81,711	87,880
Deferred revenues	93,868	90,684
Total current liabilities	200,575	201,811
Taxes Payable	31,831	30,483
Other long-term liabilities	2,465	2,932
Total liabilities	234,871	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; 80,734 and 80,205 issued and outstanding, respectively)	8	8
Additional paid-in capital	789,453	783,410
Accumulated other comprehensive loss, net	(106)	(140)
Retained Earnings (accumulated deficit)	4,179	(30,507)
Total stockholders’ equity	793,534	752,771
Total liabilities and stockholders’ equity	$ 1,028,405	$ 987,997