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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option Activity under Principal Option Plans

Option activity under the principal option plans as of March 31, 2015 and changes during the three months ended March 31, 2015 were as follows:

 

     Shares
(in thousands)		      Weighted-Average
Exercise Price		      Weighted-Average
Remaining
Contractual Term
(in years)		      Aggregate Intrinsic
Value
(in thousands)		  

Outstanding as of December 31, 2014

      184       $ 19.71         3.59       $ 3,540   

Granted

      —           —           

Exercised

      —           —           

Forfeited

      —           —           

Expired

      —           —           
  

 

 

     

 

 

     

 

 

     

 

 

  

Outstanding as of March 31, 2015

   184    $ 19.71      3.35    $ 4,017   
  

 

 

     

 

 

     

 

 

     

 

 

  

Exercisable as of March 31, 2015

   86    $ 12.46      2.30    $ 2,505