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Long-Term Investments (Tables)
3 Months Ended
Mar. 31, 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
   
Gross
   
Estimated
 
 
   
Unrealized
   
Unrealized
   
Fair
 
March 31, 2020
 
Cost
   
Gains
   
Losses
   
Value
 
Failed Auction Security
  $
3,000
    $
—  
    $
443
    $
2,557
 
                                 
 
 
 
 
 
                                 
 
   
Gross
   
Gross
   
Estimated
 
 
   
Unrealized
   
Unrealized
   
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 March 31, 2020, by contractual maturity,
are shown below (in thousands):
                 
 
   
Estimated
 
 
Cost
   
Fair Value
 
Due in twenty to forty years
  $
3,000
    $
2,557
 
                 
 
 
 
 
 
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):
                 
 
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
   
(1
)    
(1
)
                 
Balance at the end of the period
  $
36
    $
40