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Available-for-Sale Securities (Tables)
 12 Months Ended
Dec. 31, 2013
Available-for-Sale Securities  
Schedule of available-for-sale securities
(In thousands)
  December 31,
2013		   December 31,
2012		  

Cash and cash equivalents

   $ 125,009   $ 86,298  

Short-term investments

     321,615     153,640  

Marketable securities

     55,374     95,194  

Restricted cash

     833     833  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 502,831   $ 335,965  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of amortized cost and estimated fair values for available-for-sale securities
  December 31, 2013  
(In thousands)
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Estimated
Fair Value		  

U.S. government securities

   $ 42,104   $ 55   $ (1 ) $ 42,158  

U.S. government agencies

     141,278     61     (8 )   141,331  

U.S. corporate notes

     94,923     54     —     94,977  

U.S. commercial paper

     102,021     2     (1 )   102,022  

Money market funds

     122,343     —     —     122,343  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 502,669   $ 172   $ (10 ) $ 502,831  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   December 31, 2012  
(In thousands)
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Estimated
Fair Value		  

U.S. government securities

   $ 27,197   $ 10   $ (2 ) $ 27,205  

U.S. government agencies

     115,397     85     (16 )   115,466  

U.S. corporate notes

     91,544     32     (10 )   91,566  

U.S. commercial paper

     23,082     —     —     23,082  

Money market funds

     78,646     —     —     78,646  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 335,866   $ 127   $ (28 ) $ 335,965  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​