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Long-Term Investments (Tables)
3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities

The following is a summary of available-for-sale securities (in thousands):

 

            Gross      Gross      Estimated  
            Unrealized      Unrealized      Fair  
March 31, 2017    Cost      Gains      Losses      Value  

Failed Auction Security

   $ 3,000      $ —      $ 474      $ 2,526  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

            Gross      Gross      Estimated  
            Unrealized      Unrealized      Fair  
December 31, 2016    Cost      Gains      Losses      Value  

Failed Auction Security

   $ 3,000      $ —      $ 492      $ 2,508  
  

 

 

    

 

 

    

 

 

    

 

 

 
Rollforward of Credit (Gain) Loss Recognized in Earnings on Failed Auction Security

The following table represents a rollforward of the activity related to the credit loss recognized in earnings on the Failed Auction Security for the three months ended March 31 (in thousands):

 

     2017      2016  

Balance at the beginning of the period

   $ 59      $ 72  

Reductions in the amount related to credit gain for which other-than-

     

    temporary impairment was not previously recognized

     (3      (4
  

 

 

    

 

 

 

Balance at the end of the period

   $ 56      $ 68