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Investments
 12 Months Ended
Dec. 31, 2013
Investments  
Investments

C.    Investments

        As of December 31, 2013 and 2012, our investments equaled $186.8 million and $180.8 million, respectively, and consisted of securities classified as available-for-sale in accordance with accounting standards which provide guidance related to accounting and classification of certain investments in debt and equity securities.

        The following is a summary of our investments as of December 31, 2013 and 2012 (in thousands):

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

Corporate debt securities

                          

Due in one year or less

   $ 42,609   $ 44   $ (4 ) $ 42,649  

Due in one to three years

     91,443     137     (106 )   91,474  

U.S. treasury and government agency securities

                          

Due in one year or less

     18,526     19     —     18,545  

Due in one to three years

     34,123     37     (25 )   34,135  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total investments

   $ 186,701   $ 237   $ (135 ) $ 186,803  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

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

Corporate debt securities

                          

Due in one year or less

   $ 52,332   $ 88   $ (6 ) $ 52,414  

Due in one to three years

     59,176     137     (37 )   59,276  

U.S. treasury and government agency securities

                          

Due in one year or less

     24,795     86     —     24,881  

Due in one to three years

     34,606     84     (2 )   34,688  

Commercial paper

                          

Due in one year or less

     9,494     1     (4 )   9,491  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total investments

   $ 180,403   $ 396   $ (49 ) $ 180,750  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

  • Impairments and Unrealized Gains and Losses on Investments

        We did not recognize any other-than-temporary impairment losses in our consolidated statements of operations related to our securities during either 2013 or 2012. We considered various factors, including the length of time that each security was in an unrealized loss position and our ability and intent to hold these securities until the recovery of their amortized cost basis occurs. As of December 31, 2013, none of our investments has been in an unrealized loss position for more than one year. Future events may occur, or additional information may become available, which may cause us to identify credit losses where we do not expect to receive cash flows sufficient to recover the entire amortized cost basis of a security and which may necessitate the recording of future realized losses on securities in our portfolio. Significant losses in the estimated fair values of our investments could have a material adverse effect on our earnings in future periods.

  • Realized Gains and Losses on Investments

        Gains and losses are determined on the specific identification method. Realized gains were insignificant during 2013. During 2012, we recorded realized losses of $1.5 million to our consolidated statement of operations related to the sale of our then-remaining auction rate securities portfolio.