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Restricted Investments, Held to Maturity (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019
 
 
 
Gross Unrealized
 
 
 
Cost or Amortized
Cost
 
Gains
 
Temporary
Losses
 
Estimated Fair Value
 
(In thousands)
US corporate securities
$
11,540

 
$
2

 
$
(4
)
 
$
11,538

Municipal bonds
100

 
—

 
—

 
100

Restricted investments, held-to-maturity
$
11,640

 
$
2

 
$
(4
)
 
$
11,638

 
 
 
 
 
 
 
 

 
December 31, 2018
 
 
 
Gross Unrealized
 
 
 
Cost or Amortized
Cost
 
Gains
 
Temporary
Losses
 
Estimated Fair Value
 
(In thousands)
US corporate securities
$
15,296

 
$
1

 
$
(16
)
 
$
15,281

Municipal bonds
1,082

 
—

 
—

 
1,082

Negotiable certificate of deposits
1,035

 
—

 
—

 
1,035

Restricted investments, held-to-maturity
$
17,413

 
$
1

 
$
(16
)
 
$
17,398