v2.4.0.8
Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2010 $ 232,453 $ 150 $ (2,995) $ 251,844 $ 2,181 $ (18,727)
Balance, shares at Dec. 31, 2010   150,172,000 (1,409,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   6,229,000        
Exercise of stock options 19,968 6   19,962    
Stock-based compensation expense 19,015     19,015    
Income tax benefit from employee stock option plans 26,205     26,205    
Net unrealized gain (loss) on investments—net of taxes (1,153)       (1,153)  
Net unrealized loss on derivatives qualifying as cash flow hedges (74)       (74)  
Net change in cumulative translation adjustments (552)       (552)  
Net income 62,492         62,492
Balance at Dec. 31, 2011 358,354 156 (2,995) 317,026 402 43,765
Balance, shares at Dec. 31, 2011   156,401,000 (1,409,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   4,779,000        
Exercise of stock options 27,183 5   27,178    
Issuance of common stock in connection with employee stock purchase plan (in shares)   577,000        
Issuance of common stock in connection with employee stock purchase plan 10,904 1   10,903    
Stock-based compensation expense 30,690     30,690    
Income tax benefit from employee stock option plans 14,278     14,278    
Net unrealized gain (loss) on investments—net of taxes 2,165       2,165  
Net change in cumulative translation adjustments 524       524  
Net income 66,836         66,836
Balance at Dec. 31, 2012 510,934 162 (2,995) 400,075 3,091 110,601
Balance, shares at Dec. 31, 2012   161,757,000 (1,409,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   2,488,000        
Exercise of stock options 12,888 2   12,886    
Issuance of common stock in connection with employee stock purchase plan (in shares)   672,000        
Issuance of common stock in connection with employee stock purchase plan 12,696 1   12,695    
Issuance of common stock upon vesting of restricted stock units   228,000        
Tax withholding upon vesting of restricted stock awards (in shares)   (70,000)        
Tax withholding upon vesting of restricted stock awards (1,452)     (1,452)    
Repurchase and retirement of common stock (in shares) 2,100,000 (3,540,000) 1,409,000      
Repurchase and retirement of common stock (38,949) (4) 2,995 (8,929)   (33,011)
Stock-based compensation expense 43,909     43,909    
Income tax benefit from employee stock option plans 3,460     3,460    
Net unrealized gain (loss) on investments—net of taxes (382)       (382)  
Net change in cumulative translation adjustments (1,617)       (1,617)  
Net income 44,273         44,273
Balance at Dec. 31, 2013 $ 585,760 $ 161 $ 0 $ 462,644 $ 1,092 $ 121,863
Balance, shares at Dec. 31, 2013   161,535,000 0