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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2013
Stockholders' Equity [Abstract]  
Summary of company's stock option activity
         
    Options  

Outstanding on January 1, 2013

    4,644  

Granted

    900  

Exercised

    (49

Expired

    (39

Forfeited

    (103
   

 

 

 

Outstanding on March 31, 2013

    5,353  
   

 

 

 
Summary of restricted stock award activity
         
    Shares  

Issued and unvested, January 1, 2013

    670  

Granted

    307  

Vested

    (306

Forfeited

    (27
   

 

 

 

Issued and unvested, March 31, 2013

    644