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

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

 

 

Quarter Ended
September 30, 2013

 

 

Nine Months Ended
September 30, 2013

 

 

Shares

 

 

Weighted-
Average Grant

Date Fair Value

 

 

Shares

 

 

Weighted-
Average Grant

Date Fair Value

 

Unvested awards, beginning             

 

  2,094

 

 

$

  18.44

 

 

 

  1,956

 

 

$

  17.63

 

Awards granted             

 

  43

 

 

 

  24.32

 

 

 

  952

 

 

 

  19.72

 

Awards forfeited/cancelled             

 

(11

)

 

 

  18.26

 

 

 

(72

)

 

 

  18.41

 

Awards vested             

 

(41

)

 

 

  19.72

 

 

 

(751

)

 

 

  17.70

 

Unvested awards, ending             

 

  2,085

 

 

$

  18.54

 

 

 

  2,085

 

 

$

  18.54