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Long-Term Investments (Tables)
6 Months Ended
Jun. 30, 2019
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, 2019
 
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Estimated
Fair
Value
 
Failed Auction Security
  $
3,000
    $
 —  
    $
 435
    $
 2,565
 
                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                 
December 31, 2018
 
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Estimated
Fair
Value
 
Failed Auction Security
  $
3,000
    $
—  
    $
 474
    $
 2,526
 
                                 
 
 
 
 
 
 
 
 
Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities
The cost and estimated fair value of the Failed Auction Security on June 30, 2019, by contractual maturity,
are shown below (in thousands):
                 
 
Cost
   
Estimated
Fair Value
 
Due in twenty to forty years
  $
3,000
    $
 2,565
 
                 
 
 
 
 
 
 
 
 
 
 
 
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):
                 
 
2019
   
2018
 
Balance at the beginning of the period
  $
 41
    $
 48
 
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized
   
(2
)    
(4
)
                 
Balance at the end of the period
  $
 39
    $
 44