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Long-Term Investments (Tables)
6 Months Ended
Jun. 30, 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):

 

June 30, 2017

   Cost      Gross
Unrealized
Gains
     Gross
Unrealized
Losses
     Estimated
Fair
Value
 

Failed Auction Security

   $ 3,000    $  —      $ 435    $ 2,565
  

 

 

    

 

 

    

 

 

    

 

 

 

 

December 31, 2016

   Cost      Gross
Unrealized
Gains
     Gross
Unrealized
Losses
     Estimated
Fair
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 six months ended June 30 (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

     (6      (7
  

 

 

    

 

 

 

Balance at the end of the period

   $ 53    $ 65