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Stockholders' Equity and Equity Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Summary of Unvested Restricted Common Stock Activity

Stock-Based Awards. A summary of our unvested restricted common stock activity during the first quarter ended March 31, 2013 is as follows (shares in thousands):

 

 

 

 

 

Quarter Ended
March 31, 2013

 

 

 

Shares

Weighted-
Average Grant
Date Fair Value

 

 

 

Unvested awards, beginning             

              1,956             

$              17.63             

Awards granted             

              894             

              19.47             

Awards forfeited/cancelled             

              (11)

              16.40             

Awards vested             

              (703)

              17.59             

 

 

 

Unvested awards, ending             

              2,136             

$              18.42