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Marketable Investments (Tables)
 12 Months Ended
Dec. 31, 2013
Marketable Investments  
Schedule of marketable investments classified as held-to-maturity

Marketable investments classified as held-to-maturity consist of the following (in thousands):

As of December 31, 2013
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

Government-sponsored enterprises

   $ 445,939   $ 257   $ (77 ) $ 446,119  

Corporate notes and bonds

     411,455     300     (163 )   411,592  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 857,394   $ 557   $ (240 ) $ 857,711  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Reported under the following captions on the consolidated balance sheet:

                          

Current marketable investments

   $ 409,645                    

Noncurrent marketable investments

     447,749                    
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 857,394                    
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         


 

As of December 31, 2012
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

Government-sponsored enterprises

   $ 350,043   $ 261   $ (35 ) $ 350,269  

Corporate notes and bonds

     280,385     184     (140 )   280,429  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 630,428   $ 445   $ (175 ) $ 630,698  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Reported under the following captions on the consolidated balance sheet:

                          

Current marketable investments

   $ 325,175                    

Noncurrent marketable investments

     305,253                    
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 630,428                    
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         
Summary of gross unrealized losses and the length of time marketable investments have been in a continuous unrealized loss position

The following table summarizes gross unrealized losses and the length of time marketable investments have been in a continuous unrealized loss position (in thousands):

 
   As of December 31,  
 
   2013   2012  
 
   Fair
Value		   Gross
Unrealized
Loss		   Fair
Value		   Gross
Unrealized
Loss		  

Government-sponsored enterprises:

                          

Continuous unrealized loss position less than one year

   $ 76,651   $ (77 ) $ 72,727   $ (35 )

Continuous unrealized loss position greater than one year

     —     —     —     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     76,651     (77 )   72,727     (35 )

Corporate notes and bonds:

                          

Continuous unrealized loss position less than one year

     168,669     (163 )   90,960     (140 )

Continuous unrealized loss position greater than one year

     —     —     —     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     168,669     (163 )   90,960     (140 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 245,320   $ (240 ) $ 163,687   $ (175 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Summary of the contractual maturities of held-to-maturity marketable investments

The following table summarizes the contractual maturities of held-to-maturity marketable investments at December 31, 2013 (in thousands):

 
   As of December 31, 2013  
 
   Amortized
Cost		   Fair
Value		  

Due in less than one year

   $ 409,645   $ 409,751  

Due in one to two years

     325,818     325,960  

Due in three to five years

     121,931     122,000  

Due after five years

     —     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 857,394   $ 857,711  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​