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Stockholder's Equity (Tables)
6 Months Ended
Jun. 30, 2012
Stockholders' Equity and Comprehensive Income [Abstract]  
Summary of activity related to restricted stock units
         
    Unvested
Shares
 

Outstanding at December 31, 2011

    1,393,009  

Granted

    618,566  

Forfeited

    (15,177

Vested and Issued

    (585,808

Vested and Unissued

    (71,744
   

 

 

 

Outstanding at June 30, 2012

    1,338,846