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Stockholder's Equity (Tables)
3 Months Ended
Mar. 31, 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

    609,916  

Forfeited

    (4,128

Vested and Issued

    (574,949

Vested and Unissued

    (71,744
   

 

 

 

Outstanding at March 31, 2012

    1,352,104