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Long-Term Investments (Tables)
9 Months Ended
Sep. 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):
 
September 30, 2020
  
Cost
 
  
Gross
Unrealized
Gains
 
  
Gross
Unrealized
Losses
 
  
Estimated
Fair
Value
 
Failed Auction Security
  
$
3,000
 
  
$
—  
 
  
$
409
 
  
$
2,591
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
December 31, 2019
  
Cost
 
  
Gross
Unrealized
Gains
 
  
Gross
Unrealized
Losses
 
  
Estimated
Fair
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 September 30, 2020, by contractual maturity, are shown below (in thousands):
 
 
  
Cost
 
  
Estimated
Fair Value
 
Due in twenty to forty years
  
$
3,000
 
  
$
2,591
 
 
  
 
 
 
  
 
 
 
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 nine months ended September 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
     (3      (3
  
 
 
    
 
 
 
Balance at the end of the period
   $ 34    $ 38