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Stockholders' Equity (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred Stock, Shares Authorized   5,000,000 5,000,000  
Preferred Stock, Par or Stated Value Per Share   $ 0.001 $ 0.001  
TSR PRSUs Vested During the Period 470,000      
Preferred stock, shares outstanding          
Exercise period   10 years    
Available for future grant   1,286,000    
PRSUs Vested During the Period   117,000    
Number of common stock issued to exercise stock options   177,000    
Stockholders Equity (Textual) [Abstract]        
Issuance price of stock under the stock issuance program   85.00%    
Closing price of stock   $ 32.33    
Proceeds from exercise of stock options   $ 3,400,000 $ 500,000 $ 2,900,000
Total intrinsic value   2,000,000 400,000 1,600,000
Total fair value of options vested   6,800,000 15,100,000 17,300,000
Weighted average fair value option granted       $ 12.31
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting over a period of options   36 months    
Annual vesting percentage   25.00%    
Unrecognized compensation expense, stock option   600,000    
Expected weighted average period   0 years 8 months 12 days    
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage   25.00%    
Total fair value of RSU   10,400,000 5,600,000 4,300,000
Unrecognized compensation expense, stock option   16,100,000    
Expected weighted average period   2 years 9 months 18 days    
Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense, stock option   4,700,000    
Expected weighted average period   1 year 1 month 6 days    
ESPP [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense, stock option   3,300,000    
Equity Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of acceleration of stock options in case of change in control   50.00%    
Equity Incentive Plan 2004 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum initially allowed for the issuance of common stock   7,000,000    
Maximum automatic annual percentage share increase to 2004 plan   4.00%    
Maximum automatic annual share increase to 2004 plan   4,000,000    
Available for future grant   1,286,075    
Stock Incentive Plan 1998 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum initially allowed for the issuance of common stock   4,300,000    
Maturity period of option under stock incentive plan   10 years    
Employee Stock Purchase Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum initially allowed for the issuance of common stock   100,000    
Available for future grant   1,600,000    
Annual increase of shares reserved for future issuance Maximum Number of Shares condition one   600,000    
Annual increase of shares reserved for future issuance as percentage of companies outstanding shares immediately preceding year condition one Maximum   1.00%    
Number of share purchased under ESPP   417,154 368,639 228,091
Stockholders Equity (Textual) [Abstract]        
Maximum percentage of annual compensation   15.00%    
Maximum amount withheld to purchase shares of the company   $ 21,250    
Percentage of common stock purchase price   85.00%    
Employee Stock Purchase Plan Offering Period   2 years    
Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
TSR PRSUs Percentage of Target Number of Shares Eligible to Receive   0.00%    
Percentage of target number of shares   0.00%    
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
TSR PRSUs Percentage of Target Number of Shares Eligible to Receive   350.00%    
Vesting over a period of options   4 years    
Percentage of target number of shares   250.00%    
Officer [Member] | Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage   33.00%    
Series A Preferred Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred Stock Shares Authorized Designated Series A Participating Preferred Stock   477,654    
Preferred Stock, Par or Stated Value Per Share   $ 0.001    
Convertible Preferred Stock Conversion Per Share   20    
Preferred Stock, Liquidation Preference Per Share   $ 648.20