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Restricted Investments, Held to Maturity
 9 Months Ended
Sep. 30, 2018
Schedule of Investments [Abstract]  
Restricted Investments, Held to Maturity
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:
 
September 30, 2018
 
 
 
Gross Unrealized
 
 
 
Cost or Amortized
Cost
 
Gains
 
Temporary
Losses
 
Estimated Fair Value
 
(In thousands)
United States corporate securities
$
17,039

 
$
—

 
$
(13
)
 
$
17,026

Municipal bonds
2,437

 
—

 
(2
)
 
2,435

Negotiable certificate of deposits
1,035

 
—

 
—

 
1,035

Restricted investments, held-to-maturity
$
20,511

 
$
—

 
$
(15
)
 
$
20,496

 
 
 
 
 
 
 
 

 
December 31, 2017
 
 
 
Gross Unrealized
 
 
 
Cost or Amortized
Cost
 
Gains
 
Temporary
Losses
 
Estimated Fair Value
 
(In thousands)
United States corporate securities
$
15,982

 
$
—

 
$
(14
)
 
$
15,968

Municipal bonds
4,970

 
—

 
(10
)
 
4,960

Negotiable certificate of deposits
1,280

 
—

 
—

 
1,280

Restricted investments, held-to-maturity
$
22,232

 
$
—

 
$
(24
)
 
$
22,208

 
 
 
 
 
 
 
 

As of September 30, 2018, the contractual maturities of the restricted investments, held-to-maturity, were one year or less. There were 29 securities and 32 securities that were in an unrealized loss position for less than twelve months as of September 30, 2018 and December 31, 2017, respectively. The Company did not recognize any impairment losses during the quarter and year-to-date September 30, 2018 periods.
Refer to Note 14 for additional information regarding fair value measurements of the Company's investments.