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Long-Term Investments (Tables)
6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities
The following is a summary of the
available-for-sale
security (in thousands):
 
 
         
Gross

Unrealized
    
Gross

Unrealized
    
Estimated

Fair
 
June 30, 2020
 
Cost
 
 
Gains
 
 
Losses
 
 
Value
 
Failed Auction Security
   $ 3,000    $ —        $ 445    $ 2,555
  
 
 
    
 
 
    
 
 
    
 
 
 
 
 
  
 
 
  
Gross

Unrealized
 
  
Gross

Unrealized
 
  
Estimated

Fair
 
December 31, 2019
 
Cost
 
 
Gains
 
 
Losses
 
 
Value
 
Failed Auction Security
   $ 3,000    $ —        $ 490    $ 2,510
  
 
 
    
 
 
    
 
 
    
 
 
 
Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities
The amortized cost and estimated fair value of the Failed Auction Security on June 30, 2020, by contractual maturity, are shown below (in thousands):
 
 
 
 
 
 
Estimated
 
   
Cost
 
  
Fair Value
 
Due in twenty to forty years
 
$
3,000
  
$
2,555
  
 
 
    
 
 
 
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):
 
    
2020
 
  
2019
 
Balance at the beginning of the period
   $ 37    $ 41
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized
     (2      (2
  
 
 
    
 
 
 
Balance at the end of the period
   $ 35    $ 39
  
 
 
    
 
 
 
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