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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Shareholders' Equity  
Schedule of stock option activity

   Stock option activity for the year ended December 31, 2013 was as follows:

 
   Shares
Subject to
Options		   Weighted
Average
Option Price		   Weighted
Average
Remaining
Contractual
Term (Yrs)		   Aggregate
Intrinsic Value
(in millions) (b)		  

Outstanding at December 31, 2012

     4,888,137   $ 11.11              

Granted

     1,078,311     19.19              

Exercised

     (871,991 )   9.66              

Forfeited

     (216,893 )   12.03              
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     4,877,564   $ 13.12     6.3   $ 32.8  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Vested at December 31, 2013

     2,827,102   $ 10.66     4.7   $ 25.8  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Vested and expected to vest at December 31, 2013 (a)

     4,734,032   $ 13.01     6.3   $ 32.3  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
(a)
In addition to the options that are vested at December 31, 2013, the Company expects a portion of the unvested options to vest in the future. Options expected to vest in the future are determined by applying an estimated forfeiture rate to the options that are unvested as of December 31, 2013.

(b)
The aggregate intrinsic value is based on the positive difference between the fair value of the Company's common stock price of $19.77 on December 31, 2013, or the date of exercises, as appropriate, and the exercise price of the underlying stock options.
Schedule of restricted stock activity

The following table summarizes information about restricted stock activity during the year ended December 31, 2013:

 
   Shares
Subject to
Restriction		   Weighted
Average Grant
Date Fair
Value		  

Outstanding at December 31, 2012

     341,622   $ 15.16  

Granted

     121,072     19.10  

Vested

     (93,646 )   15.13  

Forfeited

     (11,100 )   10.25  
             
​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     357,948   $ 16.65  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​