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Marketable Securities
9 Months Ended
Sep. 30, 2011
Marketable Securities [Abstract] 
Marketable Securities
4.   Marketable Securities
 
    The following table is a summary of our marketable securities as of September 30, 2011:
                                 
            Gross     Gross        
    Amortized     Unrealized     Unrealized        
    Cost     Gains     Losses     Fair Value  
    (In thousands)  
Municipal bonds
   $ 6,655     $ 7     $ —     $ 6,662  
Corporate bonds
     8,765       —       (24 )     8,741  
Commercial paper
     15,968       5       (11 )     15,962  
 
                        
Total
   $ 31,388     $ 12     $ (35 )   $ 31,365  
 
                        

    Our investment in marketable securities is included in the following accounts on the Condensed Consolidated Balance Sheets:
                 
    September 30     December 31  
    2011     2010  
    (In thousands)  
Marketable securities
   $ 29,830     $ —  
Marketable securities — long term
     1,535       —  
 
            
Total
   $ 31,365     $ —  
 
            
    Our investments in marketable securities are classified as available-for-sale and are carried at fair value with any unrealized gains and losses recorded in Other comprehensive income. All unrealized gains and losses as of September 30, 2011 are temporary. As of September 30, 2011, the contractual maturities of our marketable securities range from October 2011 to January 2013.