Investments - Schedule of Investments (Details) - Unrestricted available-for-sale, Debt securities - U.S. Treasury Bills - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt securities and restricted investments
Amortized Cost	$ 118,504	$ 88,966
Gross Unrealized Gains		1
Gross Unrealized (Losses)	(331)	(11)
Fair Value	$ 118,173	$ 88,956

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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