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Cash and Investments in Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Cash and Investments in Marketable Securities, Including Cash Equivalents and Restricted Cash

Cash and investments in marketable securities, including cash equivalents and restricted cash, are as follows (in thousands).

 

     Estimated Fair Value at  
     September 30,
2015
     December 31,
2014
 

Cash and cash equivalents

   $ 18,819       $ 12,365   

Short-term investments

     249,000         225,459   

Restricted cash

     —           25,000   
  

 

 

    

 

 

 

Total cash and investments in marketable securities

   $ 267,819       $ 262,824   
  

 

 

    

 

 

 
Portfolio of Cash and Investments in Marketable Securities

Our portfolio of cash and investments in marketable securities includes (in thousands):

 

          Estimated Fair Value at  
     Fair Value
Hierarchy
Level
   September 30,
2015
     December 31,
2014
 

Corporate notes and bonds

   2    $ 180,300       $ 182,544   

Corporate commercial paper

   2      65,770         42,915   
     

 

 

    

 

 

 

Available-for-sale investments

        246,070         225,459   

Money market funds

   1      17,230         11,229   

Certificate of deposit

   N/A      2,930         —     

Cash, including restricted cash

   N/A      1,589         26,136   
     

 

 

    

 

 

 

Total cash and investments in marketable securities

      $ 267,819       $ 262,824