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Stock Options (Tables)
6 Months Ended
Jun. 30, 2013
Stock Options Tables  
Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

A summary of activity related to aggregate stock options under all plans is indicated in the following table (in thousands, except per share amounts):

    As of June 30, 2013
          Weighted     Weighted      
    Number     average     average remaining     Aggregate
    of     exercise     contractual     intrinsic
    options     price     term     value
    (in thousands)           (in years)     (in thousands)
Options outstanding at beginning                      
     of year   7,390    $ 6.75             
Options granted   1,910      8.91             
Options exercised   1,298      4.93             
Options forfeited/expired   373      13.57             
Options outstanding at June 30, 2013   7,629      7.27      7.54    $ 61,009 
                       
Vested and expected to vest   7,109      7.18      7.42    $ 57,540 
                       
Options exercisable at June 30, 2013   3,614    $ 6.54      5.98    $ 32,144