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Long-Term Investments (Tables)
12 Months Ended
Dec. 31, 2018
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):

 
December 31, 2018
 
Cost
 
 
Gross

Unrealized

Gains
 
 
Gross

Unrealized

Losses
 
 
Estimated 
Fair

Value
 
Failed Auction Security
 
$
3,000
 
 
$
 
 
$
474
 
 
$
2,526
 
 
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
Failed Auction Security
 
$
3,000
 
 
$
 
 
$
475
 
 
$
2,525
 
Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities
The amortized cost and estimated fair value of the available-for-sale security on December 31, 2018, by contractual maturities, are shown below (in thousands):

 
 
 
Cost
 
 
Estimated 
Fair
Value
 
Due in twenty to forty years
 
$
3,000
 
 
$
2,526
 
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 available-for-sale auction rate security held by the Company for the years ended December 31 (in thousands):

 
 
 
2018
 
 
2017
 
 
2016
 
Balance at the beginning of the period
 
$
48
 
 
$
59
 
 
$
72
 
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized
 
 
(7
)
 
 
(11
)
 
 
(13
)
Balance at the end of the period
 
$
41
 
 
$
48
 
 
$
59