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Restricted Available-for-Sale Investments - Reconciliation of Restricted Available-for-sale Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value $ 22,489 $ 20,416
Restricted Investments    
Schedule Of Available For Sale Securities [Line Items]    
Total restricted available-for-sale investments 22,968 21,158
Gross Unrealized Losses (479) (742)
Estimated Fair Value $ 22,489 $ 20,416