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Share Based Compensation (Tables)
6 Months Ended
Jun. 30, 2012
Share Based Compensation [Abstract]  
Summary of Option Activity Under Stock Compensation Plans
         

Options

  Number of Options  

Outstanding at December 31, 2011

    4,053,652  

Granted

    1,000  

Exercised

    —    

Forfeited

    (64,198

Expired

    (325,253
   

 

 

 

Outstanding at June 30, 2012

    3,665,201  
   

 

 

 

Exercisable at June 30, 2012

    3,121,084  
Summary of Nonvested Restricted Stock Awards
         

Awards

  Number of Awards  

Nonvested at December 31, 2011

    405,977  

Granted

    —    

Vested

    (193,503

Forfeited

    (16,220
   

 

 

 

Nonvested at June 30, 2012

    196,254