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Cash and Investments in Marketable Securities (Tables)
 6 Months Ended
Jun. 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  
     June 30,
2015		      December 31,
2014		  

Cash and cash equivalents

    $ 20,875       $ 12,365   

Restricted cash

      25,000         25,000   

Short-term investments

      233,785         225,459   
  

 

 

     

 

 

  

Total cash and investments in marketable securities

    $ 279,660       $ 262,824   
  

 

 

     

 

 

  
Portfolio of Cash and Investments in Marketable Securities

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

 

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

Corporate notes and bonds

    2    $ 185,917       $ 182,544   

Corporate commercial paper

    2      44,939         42,915   
     

 

 

     

 

 

  

Available-for-sale investments

         230,856         225,459   

Money market funds

    1      16,512         11,229   

Certificate of deposit

    N/A      2,929         —     

Cash, including restricted cash

    N/A      29,363         26,136   
     

 

 

     

 

 

  

Total cash and investments in marketable securities

       $ 279,660       $ 262,824