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Stock Options (Tables)
9 Months Ended
Sep. 30, 2014
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:

    As of September 30, 2014
          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   6,656    $ 8.03             
Options granted   1,163      33.20             
Options exercised   971      7.85             
Options forfeited/expired   508      10.26             
Options outstanding at September 30, 2014   6,340      12.50      7.37    $ 94,207 
                     
Vested and expected to vest   6,012      12.05      7.29    $ 91,391 
                     
Options exercisable at September 30, 2014   3,240    $ 6.84      6.20    $ 62,086