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Restricted Investments, Held-to-Maturity (Tables)
 3 Months Ended
Mar. 31, 2020
Schedule of Investments [Abstract]  
Schedule of Restricted Investments, Held-to-Maturity
The following tables present the cost or amortized cost, gross unrealized gains and temporary losses, and estimated fair value of the Company's restricted investments, held-to-maturity:
 
March 31, 2020
 
 
 
Gross Unrealized
 
 
 
Cost or Amortized
Cost
 
Gains
 
Temporary
Losses
 
Estimated Fair Value
 
(In thousands)
US corporate securities
$
8,836

 
$
1

 
$
(31
)
 
$
8,806

Restricted investments, held-to-maturity
$
8,836

 
$
1

 
$
(31
)
 
$
8,806

 
 
 
 
 
 
 
 

 
December 31, 2019
 
 
 
Gross Unrealized
 
 
 
Cost or Amortized
Cost
 
Gains
 
Temporary
Losses
 
Estimated Fair Value
 
(In thousands)
US corporate securities
$
8,912

 
$
4

 
$
(1
)
 
$
8,915

Restricted investments, held-to-maturity
$
8,912

 
$
4

 
$
(1
)
 
$
8,915