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Stockholders' Equity and Equity Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Summary of Unvested Restricted Common Stock Activity

Stock-Based Awards. A summary of our unvested restricted common stock activity during the second quarter and six months ended June 30, 2013 is as follows (shares in thousands):

 

 

Quarter Ended

June 30, 2013

 

 

Six Months Ended

June 30, 2013

 

 

Shares

 

 

Weighted-
Average Grant

Date Fair Value

 

 

Shares

 

 

Weighted-
Average Grant
Date Fair  Value

 

Unvested awards, beginning             

 

  2,136

 

 

$

  18.42

 

 

 

  1,956

 

 

$

  17.63

 

Awards granted             

 

  15

 

 

 

  21.61

 

 

 

  909

 

 

 

  19.50

 

Awards forfeited/cancelled             

 

(51

)

 

 

  18.57

 

 

 

(61

)

 

 

  18.44

 

Awards vested             

 

(6

)

 

 

  16.97

 

 

 

(710

)

 

 

  17.58

 

Unvested awards, ending             

 

  2,094

 

 

$

  18.44

 

 

 

  2,094

 

 

$

  18.44