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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 180,676 $ 242,953
Marketable securities, short-term 244,820 127,040
Accounts receivable, net of allowances for doubtful accounts and returns of $1,813 and $1,733, respectively 130,047 113,250
Inventories 15,983 13,968
Prepaid expenses and other current assets 44,146 47,465
Total current assets 615,672 544,676
Marketable securities, long-term 136,017 101,978
Property, plant and equipment, net 86,447 75,743
Goodwill and intangible assets, net 82,926 85,362
Deferred tax assets 19,714 15,766
Other assets 7,513 8,622
Total assets 948,289 832,147
Current liabilities:    
Accounts payable 24,517 17,718
Accrued liabilities 86,600 80,345
Deferred revenues 87,443 77,275
Total current liabilities 198,560 175,338
Other long-term liabilities 27,273 22,839
Total liabilities 225,833 198,177
Commitments and contingencies (Note 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; 80,516 and 80,583 issued and outstanding, respectively) 8 8
Additional paid-in capital 775,523 729,578
Accumulated other comprehensive income 60 294
Accumulated deficit (53,135) (95,910)
Total stockholders’ equity 722,456 633,970
Total liabilities and stockholders’ equity $ 948,289 $ 832,147