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Restricted Investments, Held-to-Maturity (Tables)
6 Months Ended
Jun. 30, 2021
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:
June 30, 2021
Gross Unrealized
Cost or Amortized
Cost
GainsTemporary
Losses
Estimated Fair Value
(In thousands)
US corporate securities$8,589 $— $(3)$8,586 
Restricted investments, held-to-maturity$8,589 $— $(3)$8,586 
December 31, 2020
Gross Unrealized
Cost or Amortized
Cost
GainsTemporary
Losses
Estimated Fair Value
(In thousands)
US corporate securities$9,001 $$(8)$8,995 
Restricted investments, held-to-maturity$9,001 $$(8)$8,995