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Net Income (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Potentially Dilutive Securities

Outstanding securities, and the number of potentially dilutive common shares underlying such securities, were as follows:

 

     December 31,  
     2013      2012      2011  

Stock options

      6,615         7,038         8,604   

Convertible Notes, principal amount

      5,050         5,050        —    

Stock appreciation rights

      503         471         525   

Restricted stock units

      311         374         203   

ESPP shares

      52         —          —    

Warrants

      20         46         46   

Performance shares

      —          —          125  
  

 

 

     

 

 

     

 

 

  

Total

      12,551         12,979         9,503