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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Weighted-Average Assumptions

The fair value for options granted was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumptions (there were no options granted during the year ended December 31, 2013):

 

     Year Ended
December 31,
 
     2012     2011  

Weighted average fair value of options granted

   $ 11.77      $ 13.26   

Risk free interest rate

     0.9     2.0

Dividend yield

     0.0     0.0

Volatility factors of the expected market price of the Company’s common stock

     63.0     61.0

Weighted-average expected life of options

     5 Years        5 Years   
Summary of Stock Option Activity

A summary of the Company’s stock option activity as of December 31, 2013, and changes during the year then ended, is presented below:

 

     Number of
Shares
    Option Price
Per Share
     Weighted Average
Exercise Price
     Aggregate
Intrinsic
Value
(in thousands)
 

Outstanding at December 31, 2012

     1,948,259      $ 2.89 –$24.65       $ 15.38      

Cancelled/forfeited

     (61,332     22.17 –24.65         23.03      

Exercised

     (753,755     2.89 –24.65         15.56      
  

 

 

   

 

 

    

 

 

    

Outstanding at December 31, 2013

     1,133,172      $ 2.89 –$24.65       $ 14.84       $ 40,138   
  

 

 

   

 

 

    

 

 

    

Exercisable at December 31, 2013

     987,843      $ 2.89 –$24.65       $ 13.71       $ 36,103   
  

 

 

   

 

 

    

 

 

    
Summary of Restricted Stock Units

A summary of the status of the Company’s restricted stock units and restricted stock awards as of December 31, 2013, and changes during the year then ended, is presented below:

 

     Non-Vested
Shares
    Weighted Average
Grant Date
Fair Value
 

Non-vested at December 31, 2012

     744,016      $ 23.51   

Awarded

     645,266      $ 35.03   

Vested

     (336,772   $ 22.85   

Cancelled/forfeited

     (66,775   $ 26.39   
  

 

 

   

Non-vested at December 31, 2013

     985,735      $ 31.07