v2.4.0.8
Income Taxes , Deferred Tax Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Taxes [Line Items]      
Income tax benefit from employee stock option plans $ 3,460,000 $ 14,278,000 $ 26,205,000
Deferred tax assets:      
Net operating loss carryforward 2,183,000 587,000  
Deferred revenue 47,341,000 36,438,000  
Nondeductible reserves and accruals 16,055,000 13,437,000  
Depreciation and amortization (465,000) 920,000  
General business credit carryforward 439,000 1,381,000  
Stock-based compensation 15,468,000 9,413,000  
Other 17,000 12,000  
Total deferred tax assets 81,038,000 62,188,000  
Foreign earnings deemed to be permanently reinvested overseas 27,500,000    
State and Local Jurisdiction [Member]
      
Deferred tax assets:      
State net operating loss carryforwards 21,700,000    
State tax credit carryforwards 4,200,000    
California [Member]
      
Deferred Taxes [Line Items]      
Amount of unrecognized deferred tax asset relating to tax credits for excess tax benefits for stock-based compensation expense $ 3,500,000